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Submission #963073

# Submission time Handle Problem Language Result Execution time Memory
963073 2024-04-14T12:59:13 Z anton Star Trek (CEOI20_startrek) C++17
7 / 100
 1 ms 2652 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[64];

void precalc(){
    pow2[0] = 2;
    for(int i = 1; i<61; i++){
        pow2[i] = (pow2[i-1] * pow2[i-1])%mod;
    }
}

int mpow(int p){
    int res= 1;
    for(int i = 0; i<61; i++){
        if((1LL<<i)&p){
            res = (res*pow2[i])%mod;
        }
    }
    return res;
}



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= mpow(2*d);

    cout<<res<<endl;
    
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Incorrect 1 ms 2652 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Incorrect 1 ms 2652 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Incorrect 1 ms 2652 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Incorrect 1 ms 2652 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Incorrect 1 ms 2652 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Incorrect 1 ms 2652 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #8
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Incorrect 1 ms 2652 KB Output isn't correct
3 Halted 0 ms 0 KB -