Submission #1399743

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Source Code Expand

#include <cstdio>

const int MOD = 1000000007;

int f[910], g[910];
int D, L, Z;

int mul(int x, int y){ return 1LL * x * y % MOD; }

int add(int x, int y){
  return (x + y < MOD ? x + y : x + y - MOD);
}

int sim(int r, int c){
  if(r < 1 || c < 1 || r * c < D + L) return 0;
  return mul(f[r * c], mul(Z, g[r * c - D - L]));
}

int main(){
  int R, C; scanf("%d%d", &R, &C);
  int X, Y; scanf("%d%d", &X, &Y);
  scanf("%d%d", &D, &L);

  f[0] = f[1] = g[0] = g[1] = 1;
  for(int i = 2; i <= X * Y; i++) g[i] = MOD - mul(MOD / i, g[MOD % i]);
  for(int i = 2; i <= X * Y; i++){
    f[i] = mul(f[i - 1], i); g[i] = mul(g[i - 1], g[i]);
  }

  Z = mul(g[D], g[L]);

  int v =
    add(sim(X, Y), add(sim(X - 2, Y), add(sim(X, Y - 2),
    add(mul(4, sim(X - 1, Y - 1)), sim(X - 2, Y - 2)))));

  int w = mul(2,
    add(sim(X - 1, Y), add(sim(X, Y - 1),
    add(sim(X - 2, Y - 1), sim(X - 1, Y - 2)))));

  int ans = mul(v > w ? v - w : v - w + MOD, (R - X + 1) * (C - Y + 1));

  printf("%d\n", ans);
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:20:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   int R, C; scanf("%d%d", &R, &C);
                                  ^
./Main.cpp:21:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   int X, Y; scanf("%d%d", &X, &Y);
                                  ^
./Main.cpp:22:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &D, &L);
                        ^

Judge Result