{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-04-06T14:01:22.000Z","description":"Problems submitted by members of the MATLAB Central community.","is_default":true,"created_by":161519,"badge_id":null,"featured":false,"trending":false,"solution_count_in_trending_period":0,"trending_last_calculated":"2026-04-06T00:00:00.000Z","image_id":null,"published":true,"community_created":false,"status_id":2,"is_default_group_for_player":false,"deleted_by":null,"deleted_at":null,"restored_by":null,"restored_at":null,"description_opc":null,"description_html":null,"published_at":null},"problems":[{"id":42636,"title":"Big Integer Multiplication","description":"Implement big integer multiply.\r\n\r\nInput:\r\n\r\nA, B : N-by-M Matrix, each row represents a positive decimal integer.\r\n\r\nOutput:\r\n\r\nC    : N-by-P Matrix, each row represents the decimal integer A*B.  \r\n\r\nExample 1:\r\n\r\n  a = [1 2 3;0 5 6];\r\n  b = [5 6;9 0];\r\n  c = BigIntMult(a,b)\r\n  c =\r\n     6     8     8     8\r\n     5     0     4     0\r\n\r\n123*56=6888 (c(1,:)), 56*90=5040 (c(2,:))\r\n\r\nExample 2 (singleton expansion):\r\n\r\n  a = [1 2 3;0 5 6];\r\n  b = [5 7];\r\n  c = BigIntMult(a,b)\r\n  c =\r\n     7     0     1     1\r\n     3     1     9     2\r\n\r\n123*57=7011 (c(1,:)), 56*57=3192 (c(2,:))\r\n\r\nNote: \r\n\r\n1.you don't need to remove the leading zeroes.\r\n\r\n2.your score will depend on your solution performance.","description_html":"\u003cp\u003eImplement big integer multiply.\u003c/p\u003e\u003cp\u003eInput:\u003c/p\u003e\u003cp\u003eA, B : N-by-M Matrix, each row represents a positive decimal integer.\u003c/p\u003e\u003cp\u003eOutput:\u003c/p\u003e\u003cp\u003eC    : N-by-P Matrix, each row represents the decimal integer A*B.\u003c/p\u003e\u003cp\u003eExample 1:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ea = [1 2 3;0 5 6];\r\nb = [5 6;9 0];\r\nc = BigIntMult(a,b)\r\nc =\r\n   6     8     8     8\r\n   5     0     4     0\r\n\u003c/pre\u003e\u003cp\u003e123*56=6888 (c(1,:)), 56*90=5040 (c(2,:))\u003c/p\u003e\u003cp\u003eExample 2 (singleton expansion):\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ea = [1 2 3;0 5 6];\r\nb = [5 7];\r\nc = BigIntMult(a,b)\r\nc =\r\n   7     0     1     1\r\n   3     1     9     2\r\n\u003c/pre\u003e\u003cp\u003e123*57=7011 (c(1,:)), 56*57=3192 (c(2,:))\u003c/p\u003e\u003cp\u003eNote:\u003c/p\u003e\u003cp\u003e1.you don't need to remove the leading zeroes.\u003c/p\u003e\u003cp\u003e2.your score will depend on your solution performance.\u003c/p\u003e","function_template":"function c = BigIntMult(a,b)","test_suite":"%% Coutresy of Alfonso Nieto-Castanon\r\nurlwrite('https://sites.google.com/a/alfnie.com/alfnie/software/SetSolutionScore.p?attredirects=0\u0026amp;d=1','SetSolutionScore.p');\r\nrehash path;\r\n\r\n%%\r\na = [1 2 3;0 5 6];\r\nb = [5 6;9 0];\r\nc = BigIntMult(a,b);\r\nassert(isequal(c(:,find(any(c,1),1):end),[6 8 8 8;5 0 4 0]))\r\n\r\n%%\r\nn = 1e2;\r\nm = 20;\r\na = randi([0 9],n,m);\r\nb = randi([0 9],1,m);\r\nc = BigIntMult(a,b);\r\nfor k = 1:n\r\n    d = c(k,:); d = d(:,find(d,1):end);\r\n assert(isequal(char(multiply(java.math.BigInteger(char(48+a(k,:))),java.math.BigInteger(char(48+b))))-48,d))\r\nend\r\n\r\n%%\r\nn = 1e2;\r\nm = 1e5;\r\na = randi([0 9],n,m);\r\nb = randi([0 9],n,m);\r\nt1 = builtin('tic');\r\nc = BigIntMult(a,b);\r\nscore = builtin('toc',t1);\r\nfor k = randi(n,1,3)\r\n    d = c(k,:); d = d(:,find(d,1):end);\r\nassert(isequal(char(multiply(java.math.BigInteger(char(48+a(k,:))),java.math.BigInteger(char(48+b(k,:)))))-48,d))\r\nend\r\nSetSolutionScore(round(5*score))","published":true,"deleted":false,"likes_count":1,"comments_count":6,"created_by":1434,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":7,"test_suite_updated_at":"2015-09-28T09:34:00.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2015-09-28T08:47:34.000Z","updated_at":"2015-10-08T18:15:12.000Z","published_at":"2015-09-28T08:47:34.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eImplement big integer multiply.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eInput:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eA, B : N-by-M Matrix, each row represents a positive decimal integer.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOutput:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eC : N-by-P Matrix, each row represents the decimal integer A*B.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eExample 1:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[a = [1 2 3;0 5 6];\\nb = [5 6;9 0];\\nc = BigIntMult(a,b)\\nc =\\n   6     8     8     8\\n   5     0     4     0]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e123*56=6888 (c(1,:)), 56*90=5040 (c(2,:))\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eExample 2 (singleton expansion):\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[a = [1 2 3;0 5 6];\\nb = [5 7];\\nc = BigIntMult(a,b)\\nc =\\n   7     0     1     1\\n   3     1     9     2]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e123*57=7011 (c(1,:)), 56*57=3192 (c(2,:))\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eNote:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e1.you don't need to remove the leading zeroes.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e2.your score will depend on your solution performance.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"}],"problem_search":{"errors":[],"problems":[{"id":42636,"title":"Big Integer Multiplication","description":"Implement big integer multiply.\r\n\r\nInput:\r\n\r\nA, B : N-by-M Matrix, each row represents a positive decimal integer.\r\n\r\nOutput:\r\n\r\nC    : N-by-P Matrix, each row represents the decimal integer A*B.  \r\n\r\nExample 1:\r\n\r\n  a = [1 2 3;0 5 6];\r\n  b = [5 6;9 0];\r\n  c = BigIntMult(a,b)\r\n  c =\r\n     6     8     8     8\r\n     5     0     4     0\r\n\r\n123*56=6888 (c(1,:)), 56*90=5040 (c(2,:))\r\n\r\nExample 2 (singleton expansion):\r\n\r\n  a = [1 2 3;0 5 6];\r\n  b = [5 7];\r\n  c = BigIntMult(a,b)\r\n  c =\r\n     7     0     1     1\r\n     3     1     9     2\r\n\r\n123*57=7011 (c(1,:)), 56*57=3192 (c(2,:))\r\n\r\nNote: \r\n\r\n1.you don't need to remove the leading zeroes.\r\n\r\n2.your score will depend on your solution performance.","description_html":"\u003cp\u003eImplement big integer multiply.\u003c/p\u003e\u003cp\u003eInput:\u003c/p\u003e\u003cp\u003eA, B : N-by-M Matrix, each row represents a positive decimal integer.\u003c/p\u003e\u003cp\u003eOutput:\u003c/p\u003e\u003cp\u003eC    : N-by-P Matrix, each row represents the decimal integer A*B.\u003c/p\u003e\u003cp\u003eExample 1:\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ea = [1 2 3;0 5 6];\r\nb = [5 6;9 0];\r\nc = BigIntMult(a,b)\r\nc =\r\n   6     8     8     8\r\n   5     0     4     0\r\n\u003c/pre\u003e\u003cp\u003e123*56=6888 (c(1,:)), 56*90=5040 (c(2,:))\u003c/p\u003e\u003cp\u003eExample 2 (singleton expansion):\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003ea = [1 2 3;0 5 6];\r\nb = [5 7];\r\nc = BigIntMult(a,b)\r\nc =\r\n   7     0     1     1\r\n   3     1     9     2\r\n\u003c/pre\u003e\u003cp\u003e123*57=7011 (c(1,:)), 56*57=3192 (c(2,:))\u003c/p\u003e\u003cp\u003eNote:\u003c/p\u003e\u003cp\u003e1.you don't need to remove the leading zeroes.\u003c/p\u003e\u003cp\u003e2.your score will depend on your solution performance.\u003c/p\u003e","function_template":"function c = BigIntMult(a,b)","test_suite":"%% Coutresy of Alfonso Nieto-Castanon\r\nurlwrite('https://sites.google.com/a/alfnie.com/alfnie/software/SetSolutionScore.p?attredirects=0\u0026amp;d=1','SetSolutionScore.p');\r\nrehash path;\r\n\r\n%%\r\na = [1 2 3;0 5 6];\r\nb = [5 6;9 0];\r\nc = BigIntMult(a,b);\r\nassert(isequal(c(:,find(any(c,1),1):end),[6 8 8 8;5 0 4 0]))\r\n\r\n%%\r\nn = 1e2;\r\nm = 20;\r\na = randi([0 9],n,m);\r\nb = randi([0 9],1,m);\r\nc = BigIntMult(a,b);\r\nfor k = 1:n\r\n    d = c(k,:); d = d(:,find(d,1):end);\r\n assert(isequal(char(multiply(java.math.BigInteger(char(48+a(k,:))),java.math.BigInteger(char(48+b))))-48,d))\r\nend\r\n\r\n%%\r\nn = 1e2;\r\nm = 1e5;\r\na = randi([0 9],n,m);\r\nb = randi([0 9],n,m);\r\nt1 = builtin('tic');\r\nc = BigIntMult(a,b);\r\nscore = builtin('toc',t1);\r\nfor k = randi(n,1,3)\r\n    d = c(k,:); d = d(:,find(d,1):end);\r\nassert(isequal(char(multiply(java.math.BigInteger(char(48+a(k,:))),java.math.BigInteger(char(48+b(k,:)))))-48,d))\r\nend\r\nSetSolutionScore(round(5*score))","published":true,"deleted":false,"likes_count":1,"comments_count":6,"created_by":1434,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":7,"test_suite_updated_at":"2015-09-28T09:34:00.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2015-09-28T08:47:34.000Z","updated_at":"2015-10-08T18:15:12.000Z","published_at":"2015-09-28T08:47:34.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eImplement big integer multiply.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eInput:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eA, B : N-by-M Matrix, each row represents a positive decimal integer.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eOutput:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eC : N-by-P Matrix, each row represents the decimal integer A*B.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eExample 1:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[a = [1 2 3;0 5 6];\\nb = [5 6;9 0];\\nc = BigIntMult(a,b)\\nc =\\n   6     8     8     8\\n   5     0     4     0]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e123*56=6888 (c(1,:)), 56*90=5040 (c(2,:))\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eExample 2 (singleton expansion):\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[a = [1 2 3;0 5 6];\\nb = [5 7];\\nc = BigIntMult(a,b)\\nc =\\n   7     0     1     1\\n   3     1     9     2]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e123*57=7011 (c(1,:)), 56*57=3192 (c(2,:))\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eNote:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e1.you don't need to remove the leading 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