Submission #1870399

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Source Code Expand

#include <cstdio>
typedef long long ll ;
#define rep(i, a, b) for (int i = a; i <= b; ++ i) 
const int f[4][2] = {{0, 0}, {1, 0}, {1, 1}, {0, 1}}, w[4] = {1, - 1, 1, - 1}, N = 2e6 + 10, mo = 1e9 + 7 ;
using namespace std ;
int a[6][2], fac[N], inv[N] ;
void upd(int &x, int y) { x = (x + y) % mo ; }
int C(int x, int y) { return (ll) fac[x + y] * inv[x] % mo * inv[y] % mo ; }
int mul(int a, int b) {
	int ans = 1, w = a % mo ;
	for ( ; b; b /= 2) {
		if (b & 1) ans = (ll) ans * w % mo ;
		w = (ll) w * w % mo ;
	}
	return ans ;
}
int calc(int xa, int ya, int xc, int yc) {
	int res = 0 ; 
	rep(i, a[2][0], a[3][0]) 
		upd(res, (ll) C(i - xa, a[2][1] - 1 - ya) * C(xc - i, yc - a[2][1]) % mo * (- i - a[2][1]) % mo) ,
		upd(res, (ll) C(i - xa, a[3][1] - ya) * C(xc - i, yc - a[3][1] - 1) % mo * (i + 1 + a[3][1]) % mo) ;
	rep(i, a[2][1], a[3][1])
		upd(res, (ll) C(a[2][0] - 1 - xa, i - ya) * C(xc - a[2][0], yc - i) % mo * (- i - a[2][0]) % mo) ,
		upd(res, (ll) C(a[3][0] - xa, i - ya) * C(xc - a[3][0] - 1, yc - i) % mo * (i + 1 + a[3][0]) % mo) ;
	return res ;
}
int main() {
	fac[0] = inv[0] = 1 ;
	rep(i, 1, N - 5) fac[i] = (ll) fac[i - 1] * i % mo ;
	inv[N - 5] = mul(fac[N - 5], mo - 2) ;
	for (int i = N - 6 ; i > 0 ; -- i) inv[i] = (ll) inv[i + 1] * (i + 1) % mo ;
	rep(i, 0, 1) rep(j, 0, 5) scanf("%d", &a[j][i]) ;
	rep(i, 0, 1) rep(j, 0, 1) -- a[j][i] ;
	int ans = 0 ;
	rep(i, 0, 3) rep(j, 0, 3) 
		upd(ans, calc(a[f[i][0]][0] + f[i][0], a[f[i][1]][1] + f[i][1], a[4 + f[j][0]][0] + f[j][0], a[4 + f[j][1]][1] + f[j][1]) * w[i] * w[j]) ;
	printf("%d\n", (ans + mo) % mo) ;
	return 0 ;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:32:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  rep(i, 0, 1) rep(j, 0, 5) scanf("%d", &a[j][i]) ;
                                                  ^

Judge Result