oj.uz

답안 #342474

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
342474 2021-01-02T08:01:03 Z benedict0724 Spring cleaning (CEOI20_cleaning) C++17
34 / 100
 1000 ms 14316 KB 
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
vector<int> adj[100002];
int leaf[100002];
int dp[100002];
ll ans = 0;
void dfs(int x, int p){
    dp[x] = leaf[x];
    for(auto u : adj[x]){
        if(u != p){
            dfs(u, x);
            dp[x] += dp[u];
        }
    }
    if(x == 1){
        if(adj[x].size() == 1 && leaf[x] == 0){
            if(dp[x] == 1){
                ans++;
                return;
            }
            else { ans = -1LL; return; }
        }
        if(dp[x]%2) { ans = -1LL; return; }
        else{
            ans += dp[x];
            return;
        }
    }

    if(dp[x] == 0){
        dp[x] = 1;
        return;
    }
    if(dp[x]%2){
        ans += dp[x];
        dp[x] = 1;
        return;
    }
    ans += dp[x];
    dp[x] = 2;
}

int main()
{
    int n, q;
    scanf("%d %d", &n, &q);
    for(int i=1;i<n;i++){
        int s, e;
        scanf("%d %d", &s, &e);
        adj[s].push_back(e);
        adj[e].push_back(s);
    }
    for(int i=1;i<=q;i++){
        fill(leaf, leaf + 30002, 0);
        int d;
        scanf("%d", &d);
        for(int i=1;i<=d;i++){
            int l;
            scanf("%d", &l);
            leaf[l]++;
        }

        ans = 0;

        dfs(1, -1);

        printf("%lld\n", ans);
    }
}

Compilation message

cleaning.cpp: In function 'int main()':
cleaning.cpp:48:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   48 |     scanf("%d %d", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~~
cleaning.cpp:51:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   51 |         scanf("%d %d", &s, &e);
      |         ~~~~~^~~~~~~~~~~~~~~~~
cleaning.cpp:58:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   58 |         scanf("%d", &d);
      |         ~~~~~^~~~~~~~~~
cleaning.cpp:61:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   61 |             scanf("%d", &l);
      |             ~~~~~^~~~~~~~~~

Subtask #1
0.0 / 0.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2796 KB Output is correct
2 Execution timed out 1085 ms 3456 KB Time limit exceeded

Subtask #2
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 3052 KB Output is correct
2 Correct 12 ms 2924 KB Output is correct
3 Correct 41 ms 7140 KB Output is correct
4 Correct 39 ms 5732 KB Output is correct
5 Correct 50 ms 7012 KB Output is correct

Subtask #3
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 3308 KB Output is correct
2 Correct 14 ms 3308 KB Output is correct
3 Correct 56 ms 14316 KB Output is correct
4 Correct 63 ms 13292 KB Output is correct
5 Correct 62 ms 13164 KB Output is correct

Subtask #4
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 254 ms 4284 KB Output is correct
2 Correct 172 ms 3564 KB Output is correct
3 Correct 250 ms 3680 KB Output is correct
4 Correct 281 ms 4076 KB Output is correct
5 Correct 232 ms 4204 KB Output is correct
6 Correct 296 ms 3988 KB Output is correct

Subtask #5
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1091 ms 5496 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1089 ms 6764 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2796 KB Output is correct
2 Execution timed out 1085 ms 3456 KB Time limit exceeded