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답안 #19395

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
19395 2016-02-24T11:14:20 Z camille Σ (kriii4_P2) C++
100 / 100
 29 ms 1716 KB 
#include <iostream>
using namespace std;
typedef long long  lld;
lld a,x,mod=1e9+7,t,ret;

lld foo(lld idx){
    if(idx==1) return a;
    lld k = foo(idx/2)%mod;
    if(idx%2) return (((k*k)%mod)*a)%mod;
    return (k*k)%mod;
}

int main(){
    cin>>t;
    while(t--){
        cin>>a>>x;
        a%=mod;
        ret+=(x*foo(mod-2))%mod;
        ret%=mod;
    }
    cout<<ret<<endl;
}

Subtask #1
100.0 / 100.0

# 결과 실행 시간 메모리 Grader output
1 Correct 28 ms 1716 KB Output is correct
2 Correct 28 ms 1716 KB Output is correct
3 Correct 27 ms 1716 KB Output is correct
4 Correct 24 ms 1716 KB Output is correct
5 Correct 28 ms 1716 KB Output is correct
6 Correct 29 ms 1716 KB Output is correct
7 Correct 27 ms 1716 KB Output is correct
8 Correct 25 ms 1716 KB Output is correct
9 Correct 28 ms 1716 KB Output is correct
10 Correct 27 ms 1716 KB Output is correct
11 Correct 28 ms 1716 KB Output is correct
12 Correct 24 ms 1716 KB Output is correct
13 Correct 28 ms 1716 KB Output is correct
14 Correct 27 ms 1716 KB Output is correct
15 Correct 26 ms 1716 KB Output is correct
16 Correct 29 ms 1716 KB Output is correct
17 Correct 27 ms 1716 KB Output is correct
18 Correct 25 ms 1716 KB Output is correct
19 Correct 29 ms 1716 KB Output is correct
20 Correct 25 ms 1716 KB Output is correct