oj.uz

답안 #900482

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
900482 2024-01-08T11:04:05 Z Trisanu_Das Spring cleaning (CEOI20_cleaning) C++17
34 / 100
 1000 ms 15356 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:47:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |     scanf("%d %d", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~~
cleaning.cpp:50:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |         scanf("%d %d", &s, &e);
      |         ~~~~~^~~~~~~~~~~~~~~~~
cleaning.cpp:57:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |         scanf("%d", &d);
      |         ~~~~~^~~~~~~~~~
cleaning.cpp:60:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |             scanf("%d", &l);
      |             ~~~~~^~~~~~~~~~

Subtask #1
0.0 / 0.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 3160 KB Output is correct
2 Execution timed out 1064 ms 4848 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 3676 KB Output is correct
2 Correct 8 ms 3748 KB Output is correct
3 Correct 21 ms 7880 KB Output is correct
4 Correct 22 ms 6868 KB Output is correct
5 Correct 28 ms 8212 KB Output is correct

Subtask #3
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 4188 KB Output is correct
2 Correct 8 ms 4188 KB Output is correct
3 Correct 33 ms 15356 KB Output is correct
4 Correct 39 ms 14948 KB Output is correct
5 Correct 30 ms 14416 KB Output is correct

Subtask #4
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 167 ms 5536 KB Output is correct
2 Correct 113 ms 4472 KB Output is correct
3 Correct 156 ms 4184 KB Output is correct
4 Correct 196 ms 4828 KB Output is correct
5 Correct 162 ms 4956 KB Output is correct
6 Correct 203 ms 5140 KB Output is correct

Subtask #5
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1059 ms 6484 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 1028 ms 8016 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 3160 KB Output is correct
2 Execution timed out 1064 ms 4848 KB Time limit exceeded
3 Halted 0 ms 0 KB -