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Submission #19253

# Submission time Handle Problem Language Result Execution time Memory
19253 2016-02-23T02:21:16 Z kaTkaHr 동전 (kriii4_E) C++14
0 / 100
 0 ms 1084 KB 
#include <stdio.h>
#include<vector>
#include <algorithm>
#include <map>

using namespace std;

typedef long long ll;

const int MX = 105, MM = 1000000007;

ll rv(ll A){
	ll R = 1, B = MM-2;
	while(B){
		if( B&1 ) R = R * A % MM;
		A = A * A % MM; B /= 2;
	}
	return R;
}

struct frac{
	ll A, B;
	frac(ll a, ll b){
		A = (a%MM+MM) % MM;
		B = (b%MM+MM) % MM;
	}
	frac(){A = 0, B = 1;}
	frac operator+ (const frac &l)const{
		return frac((A * l.B + B * l.A) % MM, B * l.B % MM);
	}
	frac operator*(const frac &l)const{
		return frac(A*l.A % MM, B*l.B % MM);
	}
	frac operator/(const frac &l)const{
		return frac(A*l.B % MM, B*l.A % MM);
	}
	frac operator- (const frac &l)const{
		return frac((A*l.B - B*l.A%MM + MM) % MM, B*l.B % MM);
	}
	ll v(){ return A * rv(B) % MM; }
};

int main()
{
	int N;
	scanf("%d", &N);
	frac p = frac(1, 1);
	for(int i = 2; i <= N; i++) p = p * frac(2, 1);
	printf("%lld", p.v());
}

Subtask #1
0.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 1084 KB Output is correct
2 Incorrect 0 ms 1084 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0.0 / 95.0

# Verdict Execution time Memory Grader output
1 Halted 0 ms 0 KB -