Submission #764660

#	Time	Username	Problem	Language	Result	Execution time	Memory
764660		Gabi88	Rack (eJOI19_rack)	C++14	100 / 100	8 ms	468 KiB

rack

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

#define LL long long

const LL mod = 1000000007;
LL n, k, br = 0, tmp = 1;

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0); cin >> n >> k; k--;
	vector<bool> v={};
	while(k > 0){ v.push_back(k%2); k /= 2; }
	while(v.size() < n) v.push_back(0);
	reverse(v.begin(), v.end());
	for(int i=0; i<n; i++){
		if (v[i]){ br += tmp; br %= mod; }
		tmp *= 2; tmp %= mod;
	}
	cout << (br+1) % mod; return 0;
}

Compilation message (stderr)

rack.cpp: In function 'int main()':
rack.cpp:13:17: warning: comparison of integer expressions of different signedness: 'std::vector<bool>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   13 |  while(v.size() < n) v.push_back(0);
      |        ~~~~~~~~~^~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 60 / 60