oj.uz

Submission #532577

# Submission time Handle Problem Language Result Execution time Memory
532577 2022-03-03T08:44:22 Z qwerasdfzxcl Newspapers (CEOI21_newspapers) C++14
0 / 100
 12 ms 1100 KB 
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
constexpr int INF = 1e9;
vector<int> adj[1010];
int dist[2002000], n;
pair<int, int> par[2002000];

int _relax(int msk){
    int ret = 0;
    for (int i=1;i<=n;i++) if (msk&(1<<(i-1))){
        for (auto &v:adj[i]) ret |= (1<<(v-1));
    }
    return ret;
}

int dep[1010];
void dfs(int s, int pa = -1){
    for (auto &v:adj[s]) if (v!=pa){
        dep[v] = dep[s] + 1;
        dfs(v, s);
    }
}

int main(){
    int m;
    scanf("%d %d", &n, &m);
    if (m>n-1) {printf("NO\n"); return 0;}

    for (int i=0;i<m;i++){
        int x, y;
        scanf("%d %d", &x, &y);
        adj[x].push_back(y);
        adj[y].push_back(x);
    }

    for (int i=1;i<=n;i++){
        dep[i] = 0;
        dfs(i);
        int cnt = 0;
        for (int j=1;j<=n;j++) if (dep[j]==3) cnt++;
        if (cnt>=3) {printf("NO\n"); return 0;}
    }

    //printf("YES\n1\n1\n");
    //return 0;

    int mx = (1<<n) - 1;
    fill(dist, dist+mx+1, INF);
    dist[mx] = 0;
    queue<int> q;
    q.push(mx);

    while(!q.empty()){
        int s = q.front(); q.pop();
        for (int i=0;i<n;i++){
            int v = s & (mx ^ (1<<i));
            v = _relax(v);
            if (dist[v]!=INF) continue;
            dist[v] = dist[s] + 1;
            par[v] = {s, i+1};
            q.push(v);
        }
    }

    if (dist[0]==INF) printf("NO\n");
    else{
        printf("YES\n");
        vector<int> ans;
        for (int cur = 0;cur!=mx;cur=par[cur].first) ans.push_back(par[cur].second);
        reverse(ans.begin(), ans.end());
        printf("%d\n", (int)ans.size());
        for (auto &x: ans) printf("%d ", x);
    }
    return 0;
}

Compilation message

newspapers.cpp: In function 'int main()':
newspapers.cpp:28:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
newspapers.cpp:33:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |         scanf("%d %d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
0.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Incorrect 0 ms 332 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #2
0.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 0 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Runtime error 12 ms 1100 KB Execution killed with signal 11
12 Halted 0 ms 0 KB -

Subtask #3
0.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Incorrect 0 ms 332 KB Output isn't correct
7 Halted 0 ms 0 KB -