답안 #32308

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
32308 2017-10-08T04:02:31 Z TAMREF Σ (kriii4_P2) C++11
100 / 100
3 ms 2176 KB
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll mod = 1e9+7;
ll npow(ll a, ll n){
    ll res = 1, pval = a%mod;
    for(;n;n>>=1,pval=pval*pval%mod){
        if(n&1) res = res*pval%mod;
    }
    return res;
}
int main(){
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int m;
    ll x=0,a,b;
    for(cin>>m;m--;){
        cin>>a>>b;
        x = (x + (b*npow(a,mod-2)%mod))%mod;
    }
    cout<<x<<'\n';
}
# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 2176 KB Output is correct
2 Correct 3 ms 2176 KB Output is correct
3 Correct 3 ms 2176 KB Output is correct
4 Correct 3 ms 2176 KB Output is correct
5 Correct 3 ms 2176 KB Output is correct
6 Correct 3 ms 2176 KB Output is correct
7 Correct 3 ms 2176 KB Output is correct
8 Correct 3 ms 2176 KB Output is correct
9 Correct 0 ms 2176 KB Output is correct
10 Correct 3 ms 2176 KB Output is correct
11 Correct 0 ms 2176 KB Output is correct
12 Correct 3 ms 2176 KB Output is correct
13 Correct 0 ms 2176 KB Output is correct
14 Correct 3 ms 2176 KB Output is correct
15 Correct 3 ms 2176 KB Output is correct
16 Correct 3 ms 2176 KB Output is correct
17 Correct 3 ms 2176 KB Output is correct
18 Correct 3 ms 2176 KB Output is correct
19 Correct 3 ms 2176 KB Output is correct
20 Correct 3 ms 2176 KB Output is correct