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Submission #414489

# Submission time Handle Problem Language Result Execution time Memory
414489 2021-05-30T13:25:52 Z aris12345678 Rack (eJOI19_rack) C++14
100 / 100
 9 ms 8120 KB 
#include <bits/stdc++.h>
using namespace std;

const int mxN = 1e6+5;
const int mod = 1e9+7;
long long pow_2[mxN];

int main() {
    int n;
    long long k;
    scanf("%d %lld", &n, &k);
    pow_2[0] = 1LL;
    for(int i = 1; i < mxN; i++) {
        pow_2[i] = 2*pow_2[i-1];
        pow_2[i] %= mod;
    }
    long long pos = 1LL;
    for(int i = n-1; i >= 0; i--) {
        if((k&1LL) == 0LL) {
            pos += pow_2[i];
            pos %= mod;
        }
        k += 1LL;
        k >>= 1LL;
    }
    printf("%lld\n", pos);
    return 0;
}

Compilation message

rack.cpp: In function 'int main()':
rack.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     scanf("%d %lld", &n, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 8012 KB Output is correct
2 Correct 9 ms 8012 KB Output is correct
3 Correct 9 ms 8012 KB Output is correct
4 Correct 9 ms 8120 KB Output is correct
5 Correct 9 ms 8012 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 8012 KB Output is correct
2 Correct 9 ms 8012 KB Output is correct
3 Correct 9 ms 8012 KB Output is correct
4 Correct 9 ms 8120 KB Output is correct
5 Correct 9 ms 8012 KB Output is correct
6 Correct 9 ms 8012 KB Output is correct
7 Correct 9 ms 8012 KB Output is correct
8 Correct 8 ms 8112 KB Output is correct
9 Correct 9 ms 8012 KB Output is correct
10 Correct 9 ms 8012 KB Output is correct

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 8012 KB Output is correct
2 Correct 9 ms 8012 KB Output is correct
3 Correct 9 ms 8012 KB Output is correct
4 Correct 9 ms 8120 KB Output is correct
5 Correct 9 ms 8012 KB Output is correct
6 Correct 9 ms 8012 KB Output is correct
7 Correct 9 ms 8012 KB Output is correct
8 Correct 8 ms 8112 KB Output is correct
9 Correct 9 ms 8012 KB Output is correct
10 Correct 9 ms 8012 KB Output is correct
11 Correct 9 ms 8104 KB Output is correct
12 Correct 8 ms 8072 KB Output is correct
13 Correct 8 ms 8012 KB Output is correct
14 Correct 9 ms 8108 KB Output is correct
15 Correct 9 ms 8112 KB Output is correct