Submission #3623787

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Source Code Expand

#include <algorithm>
#include <cassert>
#include <cctype>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstring>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <tuple>
#include <unordered_map>
#include <vector>
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define show(x) cout << #x << " = " << (x) << endl;
using namespace std;
using ll = long long;
using pii = pair<int,int>;
ll mod = 1e9+7;
pii a[20005];
int main(){
    int n;
    scanf("%d", &n);
    rep(i,2*n){
        scanf("%d", &a[i].first);
        a[i].second = i;
    }
    sort(a,a+2*n);
    ll ans = 1;
    int hoge = 0;
    rep(i,2*n){
        if(a[i].second < n){
            if(hoge< 0) ans = ans * (-hoge) % mod;
            hoge++;
        }else{
            if(hoge > 0) ans = ans * hoge % mod;
            hoge--;
        }
    }
    printf("%lld\n", ans);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:32:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
./Main.cpp:34:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &a[i].first);
                                 ^

Judge Result