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Submission #963070

# Submission time Handle Problem Language Result Execution time Memory
963070 2024-04-14T12:54:40 Z anton Star Trek (CEOI20_startrek) C++17
0 / 100
 4 ms 6748 KB 
#include<bits/stdc++.h>

using namespace std;
#define int long long

const int MAX_N = 1e5;
const int mod = 1e9+7;


vector<int> adj[MAX_N];
int pow2[MAX_N];

void precalc(){
    pow2[0] = 1;
    for(int i = 1; i<MAX_N; i++){
        pow2[i] = (pow2[i-1] * 2LL)%mod;
    }
}



signed main(){
    int n, d;
    cin>>n>>d;
    for(int i = 0; i<n-1;i++){
        int a, b;
        cin>>a>>b;

        adj[a-1].push_back(b-1);
        adj[b-1].push_back(a-1);
    }

    precalc();


    int res= pow2[2*d];

    cout<<res<<endl;
    
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3420 KB Output is correct
2 Incorrect 2 ms 3420 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3420 KB Output is correct
2 Correct 2 ms 3420 KB Output is correct
3 Runtime error 4 ms 6748 KB Execution killed with signal 11
4 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3420 KB Output is correct
2 Incorrect 2 ms 3420 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3420 KB Output is correct
2 Incorrect 2 ms 3420 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3420 KB Output is correct
2 Incorrect 2 ms 3420 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3420 KB Output is correct
2 Incorrect 2 ms 3420 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3420 KB Output is correct
2 Incorrect 2 ms 3420 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #8
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3420 KB Output is correct
2 Incorrect 2 ms 3420 KB Output isn't correct
3 Halted 0 ms 0 KB -