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Submission #1097485

# Submission time Handle Problem Language Result Execution time Memory
1097485 2024-10-07T13:03:49 Z vjudge1 Rack (eJOI19_rack) C++17
40 / 100
 1 ms 600 KB 
#include <bits/stdc++.h>
using namespace std;

using ll = long long int;

const int MOD = 1e9 + 7;

int log2_floor(unsigned long long x) {
    return x ? __builtin_clzll(1) - __builtin_clzll(x) : -1;
}

int pow(int b, int p) {
    if (!p) return 1;
    int p2 = pow(b, p >> 1);
    return (1LL * p2 * p2 * (p & 1 ? b : 1)) % MOD;
}

int test(int n, ll k) {
    k--;
    ll result = 1;

    while (k) {
        ll mask = k & (-k);
        result = (result + pow(2, n - log2_floor(mask) - 1)) % MOD;
        k ^= mask;
    }

    return result % MOD;
}

int main() {
    int n, k;
    scanf("%d %d", &n, &k);
    printf("%d\n", test(n, k));
    return 0;
}

Compilation message

rack.cpp: In function 'int main()':
rack.cpp:33:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     scanf("%d %d", &n, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

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

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 600 KB Output is correct
9 Correct 0 ms 440 KB Output is correct
10 Correct 0 ms 348 KB Output is correct

Subtask #3
0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 600 KB Output is correct
9 Correct 0 ms 440 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Incorrect 0 ms 348 KB Output isn't correct
13 Halted 0 ms 0 KB -