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Submission #290152

# Submission time Handle Problem Language Result Execution time Memory
290152 2020-09-03T12:41:50 Z sabamaku Rack (eJOI19_rack) C++14
100 / 100
 1 ms 256 KB 
#include<bits/stdc++.h>
using namespace std;

long long n,m,cur;

long long MOD = 1e9 + 7;

long long solve(long long a,long long b){
    long long ans = 1;
    while(b){
        if(b % 2 == 1){
            ans = ans * a % MOD;
        }
        a = a * a % MOD;
        b /= 2;
    }
    return ans;
}

long long ans;

int main(){
    cin >> n >> m;
    cur = n - 1;
    while(m != 1){
        if(m % 2 == 0){
            ans = (ans + solve(2,cur)) % MOD;  
        }
        cur--;
        m -= m / 2;
    }
    cout << ans + 1 << endl;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 1 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 1 ms 256 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 1 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 1 ms 256 KB Output is correct
6 Correct 1 ms 256 KB Output is correct
7 Correct 1 ms 256 KB Output is correct
8 Correct 1 ms 256 KB Output is correct
9 Correct 1 ms 256 KB Output is correct
10 Correct 1 ms 256 KB Output is correct

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 1 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 1 ms 256 KB Output is correct
6 Correct 1 ms 256 KB Output is correct
7 Correct 1 ms 256 KB Output is correct
8 Correct 1 ms 256 KB Output is correct
9 Correct 1 ms 256 KB Output is correct
10 Correct 1 ms 256 KB Output is correct
11 Correct 0 ms 256 KB Output is correct
12 Correct 1 ms 256 KB Output is correct
13 Correct 0 ms 256 KB Output is correct
14 Correct 1 ms 256 KB Output is correct
15 Correct 1 ms 256 KB Output is correct