{"trustable":true,"prependHtml":"\u003cscript\u003e window.katexOptions \u003d { disable: true }; \u003c/script\u003e\n\u003cscript type\u003d\"text/x-mathjax-config\"\u003e\n MathJax.Hub.Config({\n tex2jax: {\n inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027], [\u0027$\u0027,\u0027$\u0027]],\n displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027], [\u0027$$\u0027,\u0027$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\" type\u003d\"text/javascript\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cdiv class\u003d\"panel_content\"\u003eGiven an m×n integer matrix, find a x×y submatrix with the maximum sum of all elements.\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"The first line of input contains a positive integer T, indicating the number of test cases. For each test case, the first line contains four positive integers m, n, x, y (0\u0026lt;m,n\u0026lt;1000 AND 0\u0026lt;x\u0026lt;\u003dm AND 0\u0026lt;y\u0026lt;\u003dn), representing an m×n matrix. Following is the matrix with m rows and n integers each not exceeding 1000."}},{"title":"Output","value":{"format":"HTML","content":"For each test case, output an integer representing the maximum sum of the submatrix."}},{"title":"Sample","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e1\r\n4 5 2 2\r\n3 361 649 676 588\r\n992 762 156 993 169\r\n662 34 638 89 543\r\n525 165 254 809 280\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e2474\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e"}}]}