Submission #1338448

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Source Code Expand

#include<bits/stdc++.h>
#define rep(i,n)for(int i=0;i<(n);i++)
#define MOD 1000000007
using namespace std;
typedef long long ll;

int a[100000], b[100000];
ll fact[100001];
int main() {
	int n; scanf("%d", &n);
	rep(i, n)scanf("%d", &a[i]);
	rep(i, n)scanf("%d", &b[i]);
	sort(a, a + n); sort(b, b + n);
	fact[0] = 1;
	for (int i = 1; i <= n; i++)fact[i] = (fact[i - 1] * i) % MOD;
	int s = 0;
	ll ans = 1;
	while (s < n) {
		if (a[s] < b[s]) {
			int i; for (i = s; i < n&&a[i] < b[s]; i++);
			(ans *= fact[i - s]) %= MOD; s = i;
		}
		else {
			int i; for (i = s; i < n&&b[i] < a[s]; i++);
			(ans *= fact[i - s]) %= MOD; s = i;
		}
	}
	printf("%lld\n", ans);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:10:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  int n; scanf("%d", &n);
                        ^
./Main.cpp:11:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  rep(i, n)scanf("%d", &a[i]);
                             ^
./Main.cpp:12:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  rep(i, n)scanf("%d", &b[i]);
                             ^

Judge Result