Submission #1867353

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Source Code Expand

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

ll fact[200000],cnt[2];
int main(){
	int n;scanf("%d",&n);
	fact[0]=1;for(int i=1;i<=n;i++)fact[i]=(fact[i-1]*i)%MOD;
	vector<P>v;
	rep(j,2)rep(i,n){
		int a;scanf("%d",&a);
		v.push_back(P(a,j));
	}
	sort(v.begin(),v.end());
	int ans=1;
	for(auto p:v){
		if(cnt[!p.second]){
			(ans*=fact[cnt[!p.second]])%=MOD;
			cnt[!p.second]--;
		}
		else cnt[p.second]++;
	}
	cout<<ans<<endl;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:10:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  int n;scanf("%d",&n);
                      ^
./Main.cpp:14:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   int a;scanf("%d",&a);
                       ^

Judge Result