Submission #1988383

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Source Code Expand

#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<climits>
#include<iostream>
#include<string>
#include<stack>
#include<queue>
#include<vector>
#include<map>
#include<set>
#include<algorithm>
#include<numeric>
#include<bitset>

#define rep(n) for(int i=0;i<n;i++)
#define repp(j, n) for(int j=0;j<n;j++)
#define reppp(i, m, n) for(int i=m;i<n;i++)
#define all(c) c.begin(), c.end()
#define rall(c) c.rbegin(), c.rend()
#define MOD 1000000007LL
#define EPS 1e-9
 
using namespace std;

typedef long long ll;
typedef pair<ll, ll> Pll;
typedef pair<int, int> Pii;
struct edge{int from, to; ll cost;};

int main(){
    std::ios::sync_with_stdio(0); cin.tie(0);
    int n;
    scanf("%d", &n);
    vector<int> a(n), b(n);
    rep(n) scanf("%d", &a[i]);
    rep(n) scanf("%d", &b[i]);
    sort(all(a));

    map<int, int> mp;
    rep(n) mp[abs(a[i]-b[i])]++;

    ll fact[n+1];
    fact[0] = fact[1] = 1;
    reppp(i, 2, n+1) fact[i] = (fact[i-1] * (ll)i) % MOD;

    ll ans = 1LL;
    for(auto itr=mp.begin();itr!=mp.end();++itr){
        (ans *= fact[itr->second]) %= MOD;
    }
    printf("%lld\n", ans);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:34:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
./Main.cpp:36:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     rep(n) scanf("%d", &a[i]);
                              ^
./Main.cpp:37:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     rep(n) scanf("%d", &b[i]);
                              ^

Judge Result