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Submission #19517

# Submission time Handle Problem Language Result Execution time Memory
19517 2016-02-24T15:09:14 Z min050820 Σ (kriii4_P2) C++14
100 / 100
 21 ms 1720 KB 
#include <iostream>
using namespace std;

const long long mod=1000000007;

// dp[n] = N ^ (2^n)
long long pow_dpTable[100];

long long pow(long long N,long long P){
    N%=mod;
    pow_dpTable[0]=N;
    long long mask=1;
    long long result=1;
    int i;
    for(i=1;mask <= P;i++){
        pow_dpTable[i]=(pow_dpTable[i-1] * pow_dpTable[i-1])%mod;
        mask<<=1;
    }
    mask=1;
    for(i=0;mask <= P;i++){
        if(P&mask){
            result = (result * pow_dpTable[i]) % mod;
        }
        mask<<=1;
    }

    return result;
}

long long answer=0;

int p;

long long gcd(long long a, long long b)
{
    while (b != 0)
    {
        a %= b;
        a ^= b;
        b ^= a;
        a ^= b;
    }

    return a;
}

long long getNum(long long S,long long U){
    // Side Num
    long long gcdOfSU=gcd(S,U);
    long long mS=S / gcdOfSU;
    long long mU=U / gcdOfSU;

    long long mmS=pow(mS,mod-2);

    long long ans=(mU * mmS) % mod;
    return ans;
}

int main()
{
    cin >> p;
    for(int i=0;i<p;i++){
        long long side,sumSide;
        cin >> side >> sumSide;
        answer = (answer + getNum(side,sumSide)) % mod;

    }

    cout << answer;
    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 1720 KB Output is correct
2 Correct 20 ms 1720 KB Output is correct
3 Correct 21 ms 1720 KB Output is correct
4 Correct 20 ms 1720 KB Output is correct
5 Correct 21 ms 1720 KB Output is correct
6 Correct 20 ms 1720 KB Output is correct
7 Correct 19 ms 1720 KB Output is correct
8 Correct 17 ms 1720 KB Output is correct
9 Correct 18 ms 1720 KB Output is correct
10 Correct 18 ms 1720 KB Output is correct
11 Correct 19 ms 1720 KB Output is correct
12 Correct 20 ms 1720 KB Output is correct
13 Correct 20 ms 1720 KB Output is correct
14 Correct 16 ms 1720 KB Output is correct
15 Correct 18 ms 1720 KB Output is correct
16 Correct 19 ms 1720 KB Output is correct
17 Correct 18 ms 1720 KB Output is correct
18 Correct 18 ms 1720 KB Output is correct
19 Correct 19 ms 1720 KB Output is correct
20 Correct 20 ms 1720 KB Output is correct