Codeforces 372B counting rectangles is fun

Test instructions: give you a 40x40 01 rectangle, and now give you a Q query (1,1000000), how many rectangles in a rectangle and 0.

Thinking of solving problems: Dp,n^4 pretreatment, mainly two state transfer equations

1) Dp[i][j][s] = Dp[i][j-1][s] + 1 (mp[i][j] = = 0)

2) Ans[lx][ly][i][j] + + ans[lx][ly][i-1][j] + ans[lx][ly][i][j-1]-ans[lx][ly][i-1][j-1]

Problem Solving Code:

1 //File name:372b.cpp2 //Author:darkdream3 //Created time:2015 March 29 Sunday 20:52 13 seconds4 5#include <vector>6#include <list>7#include <map>8#include <Set>9#include <deque>Ten#include <stack> One#include <bitset> A#include <algorithm> -#include <functional> -#include <numeric> the#include <utility> -#include <sstream> -#include <iostream> -#include <iomanip> +#include <cstdio> -#include <cmath> +#include <cstdlib> A#include <cstring> at#include <ctime> - #defineLL Long Long - #defineMAXN 45 - using namespacestd; - intN, M, q; - intDP[MAXN][MAXN][MAXN]; in intVAL[MAXN][MAXN]; - intANS[MAXN][MAXN][MAXN][MAXN]; to intMP[MAXN][MAXN]; + voidSolveintLxintly) - { theMemset (DP,0,sizeof(DP)); *    for(inti = lx; I <= N;i + +) $       for(intj = ly; J <= M;j + +)Panax Notoginseng      { -            for(ints = i; s >= lx; S--) the           { +             if(Mp[s][j] = =0 ) A             { theDp[i][j][s] = dp[i][j-1][s] +1;  +ANS[LX][LY][I][J] + =Dp[i][j][s]; -}Else{ $                Break; $             } -           } -ANS[LX][LY][I][J] + = ans[lx][ly][i-1][J] + ans[lx][ly][i][j-1]-ans[lx][ly][i-1][j-1] ; the      } - }Wuyi intMain () { thescanf" %d%d%d",&n,&m,&q); -      for(inti =1; I <= N;i + +) Wu     { -         for(intj =1; J <= M;j + +) About        { $scanf"%1d",&mp[i][j]); -        } -     } -      for(inti =1; I <= N;i + +) A          for(intj =1; J <= M;j + +) +         { the solve (i,j); -         } $     intLx,ly,rx,ry; the      while(q--) the     { thescanf"%d %d%d%d",&lx,&ly,&rx,&ry); theprintf"%d\n", Ans[lx][ly][rx][ry]); -     } in return 0; the}

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Codeforces 372B counting rectangles is fun