oj.uz

Submission #531252

# Submission time Handle Problem Language Result Execution time Memory
531252 2022-02-28T09:16:02 Z 79brue Newspapers (CEOI21_newspapers) C++14
0 / 100
 1 ms 320 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

int n, m;
vector<int> link[1002];

int dfs(int x, int par = -1){
    vector<int> vec (1, 0);
    for(auto y: link[x]){
        if(y==par) continue;
        int tmp = dfs(y, x);
        vec.push_back(tmp+1);
    }

    sort(vec.rbegin(), vec.rend());
    if(par == -1){
        if(vec.size() >= 3 && vec[2] >= 2){
            puts("NO");
            exit(0);
        }
    }
    return vec[0];
}

int main(){
    scanf("%d %d", &n, &m);
    if(m!=n-1){
        puts("NO");
        return 0;
    }

    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);
    }

    for(int i=1; i<=n; i++){
        dfs(i);
    }

    printf("YES");
}

Compilation message

newspapers.cpp: In function 'int main()':
newspapers.cpp:29:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
newspapers.cpp:37:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         scanf("%d %d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
0.0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Unexpected end of file - int32 expected
2 Halted 0 ms 0 KB -

Subtask #2
0.0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 320 KB Unexpected end of file - int32 expected
2 Halted 0 ms 0 KB -

Subtask #3
0.0 / 80.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Unexpected end of file - int32 expected
2 Halted 0 ms 0 KB -