Submission #1084647

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
typedef long long lint;
typedef pair<int, int> pi;
const int mod = 1e9 + 7;

int n;
pi a[200005];

int main(){
	scanf("%d",&n);
	for(int i=0; i<n; i++){
		scanf("%d",&a[i].first);
		a[i].second = 1;
	}
	for(int i=0; i<n; i++){
		scanf("%d",&a[i+n].first);
		a[i+n].second = 2;
	}
	sort(a, a+2*n);
	int cnt = 0;
	lint ans = 1;
	for(int i=0; i<2*n; i++){
		if(a[i].second == 1){
			if(cnt < 0){
				ans *= -cnt;
				ans %= mod;
			}
			cnt++;
		}
		else{
			if(cnt > 0){
				ans *= cnt;
				ans %= mod;
			}
			cnt--;
		}
	}
	cout << ans << endl;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:11:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
./Main.cpp:13:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a[i].first);
                          ^
./Main.cpp:17:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a[i+n].first);
                            ^

Judge Result