Submission #1712927

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;

const int mod = 1000*1000*1000+7;

int N;
vector<int> A, B;
vector<int> fact;

int main() {
    fact.resize(100010);
    fact[0] = 1;
    for(int i = 1; i < 100010; i++) {
        fact[i] = 1LL * fact[i - 1] * i % mod;
    }

    scanf("%d", &N);

    A.resize(N);
    B.resize(N);

    for(int i = 0; i < N; i++) {
        scanf("%d", &A[i]);
    }
    for(int i = 0; i < N; i++) {
        scanf("%d", &B[i]);
    }

    sort(A.begin(), A.end());
    sort(B.begin(), B.end());

    int ans = 1;

    for(int i = N - 1; i >= 0; i--) {
        int s = i + 1, e = N - 1;
        int p = i;

        while(s <= e) {
            int m = (s + e)>>1;

            if(A[m] <= B[i]) {
                p = m;
                s = m + 1;
            }
            else e = m - 1;
        }

        ans = 1LL * ans * fact[p - i + 1] % mod;
    }

    cout << ans;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:17:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &N);
                    ^
./Main.cpp:23:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &A[i]);
                           ^
./Main.cpp:26:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &B[i]);
                           ^

Judge Result