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Submission #841807

# Submission time Handle Problem Language Result Execution time Memory
841807 2023-09-02T06:41:49 Z pera Rack (eJOI19_rack) C++17
100 / 100
 1 ms 548 KB 
#include <bits/stdc++.h>
using namespace std;

#define int long long

const int mod = 1e9 + 7;

int exp(int x , int y){
    int r = 1;
    x %= mod;
    while(y){
        if(y & 1) r = r * x % mod;
        x = x * x % mod;
        y /= 2;
    }
    return r;
}

main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n , k;cin >> n >> k;
    int ans = 0;
    for(int i = 0;i < n;i ++){
        if((1LL << i) >= k) break;
        if((1LL << i) & (k - 1)){
            ans = (ans + exp(2 , n - i - 1)) % mod;
        }
    }
    cout << (ans + 1) % mod << endl;
}

Compilation message

rack.cpp:19:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   19 | main() {
      | ^~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 344 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 548 KB Output is correct
7 Correct 0 ms 448 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 548 KB Output is correct
7 Correct 0 ms 448 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 0 ms 448 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct