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Submission #585678

# Submission time Handle Problem Language Result Execution time Memory
585678 2022-06-29T08:14:41 Z 반딧불(#8385) Star Trek (CEOI20_startrek) C++17
8 / 100
 1000 ms 2796 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
const ll MOD = 1000000007;

ll mpow(ll x, ll y){
    if(!y) return 1;
    if(y%2) return mpow(x, y-1) * x % MOD;
    ll tmp = mpow(x, y/2);
    return tmp*tmp%MOD;
}

int n;
ll k;
vector<int> link[100002];
int DP[100002];
int DProot[100002];
ll ans;

int X, Y;
void dfs(int x, int p=-1){
    for(auto y: link[x]){
        if(y==p) continue;
        dfs(y, x);
        if(!DP[y]) DP[x] = 1;
    }
    if(x==X){
        dfs(Y, x);
        if(!DP[Y]) DP[x] = 1;
    }
}

int main(){
    scanf("%d %lld", &n, &k);
    for(int i=1; i<n; i++){
        int x, y;
        scanf("%d %d", &x, &y);
        link[x].push_back(y);
        link[y].push_back(x);
        link[n+x].push_back(n+y);
        link[n+y].push_back(n+x);
    }

    for(int i=1; i<=n; i++){
        for(int j=1; j<=n; j++){
            for(int x=1; x<=n+n; x++) DP[x] = 0;
            X = i, Y = n+j;
            dfs(1);
            if(DP[1]) ans++;
//            else printf("%d %d: Bad\n", i, j);
        }
    }

    printf("%lld", ans%MOD);
}

Compilation message

startrek.cpp: In function 'int main()':
startrek.cpp:36:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     scanf("%d %lld", &n, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
startrek.cpp:39:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |         scanf("%d %d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Execution timed out 1086 ms 2644 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2644 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 17 ms 2772 KB Output is correct
3 Correct 17 ms 2676 KB Output is correct
4 Correct 16 ms 2644 KB Output is correct
5 Correct 16 ms 2672 KB Output is correct
6 Correct 15 ms 2660 KB Output is correct

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 17 ms 2772 KB Output is correct
3 Correct 17 ms 2676 KB Output is correct
4 Correct 16 ms 2644 KB Output is correct
5 Correct 16 ms 2672 KB Output is correct
6 Correct 15 ms 2660 KB Output is correct
7 Execution timed out 1069 ms 2796 KB Time limit exceeded
8 Halted 0 ms 0 KB -

Subtask #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 17 ms 2772 KB Output is correct
3 Correct 17 ms 2676 KB Output is correct
4 Correct 16 ms 2644 KB Output is correct
5 Correct 16 ms 2672 KB Output is correct
6 Correct 15 ms 2660 KB Output is correct
7 Execution timed out 1069 ms 2796 KB Time limit exceeded
8 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 17 ms 2772 KB Output is correct
3 Correct 17 ms 2676 KB Output is correct
4 Correct 16 ms 2644 KB Output is correct
5 Correct 16 ms 2672 KB Output is correct
6 Correct 15 ms 2660 KB Output is correct
7 Execution timed out 1069 ms 2796 KB Time limit exceeded
8 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 17 ms 2772 KB Output is correct
3 Correct 17 ms 2676 KB Output is correct
4 Correct 16 ms 2644 KB Output is correct
5 Correct 16 ms 2672 KB Output is correct
6 Correct 15 ms 2660 KB Output is correct
7 Execution timed out 1069 ms 2796 KB Time limit exceeded
8 Halted 0 ms 0 KB -

Subtask #8
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Execution timed out 1086 ms 2644 KB Time limit exceeded
3 Halted 0 ms 0 KB -