oj.uz

Submission #669019

# Submission time Handle Problem Language Result Execution time Memory
669019 2022-12-05T11:47:03 Z radinr85 Pipes (CEOI15_pipes) C++14
10 / 100
 925 ms 25292 KB 
//radinr85
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef deque<int> dq;
typedef long double ld;
typedef pair<int , int> pii;
typedef priority_queue<int> pq;

const int maxn = 3e6;
const ll mod = 1e9+7;

#define F first
#define S second
#define endl "\n"
#define pb push_back
#define ms(x , y) memset(x , y , sizeof x)
ll pw(ll a, ll b, ll md = mod){ll res = 1;while(b){if(b&1){res=(a*res)%md;}a=(a*a)%md;b>>=1;}return(res);}

const int N = 1e5 + 1;
vector<int> ver[N];
int par[N][2];
bool mark[N];
int cnt[N];
int n , m;

int get_par(int u , int x) {
    return par[u][x] == u ? u : par[u][x] = get_par(par[u][x] , x);
}
bool merge(int u , int v , int x) {
    u = get_par(u , x);
    v = get_par(v , x);

    if(u == v)
        return false;
    
    par[u][x] = v;

    return true;
}
int DFS(int u) {
    mark[u] = true;

    for(auto v : ver[u]) {
        if(!mark[v]) {
            par[v][0] = u;
            par[v][1] = par[u][1] + 1;
            cnt[u] += DFS(v);
        }
        else if(par[u][1] - par[v][1] > 1) {
            cnt[u] ++;
            cnt[v] --;
        }
    }
    if(cnt[u] == 0 && par[u][0] != 0)
        cout << u << " " << par[u][0] << endl;
    
    return cnt[u];
}

int main() {
	cin.tie(0)->sync_with_stdio(0);
	
    cin >> n >> m;
    for(int i = 1 ; i <= n ; i ++)
        par[i][0] = i , par[i][1] = i;
    for(int i = 0 ; i < m ; i ++) {
        int u , v;
        cin >> u >> v;

        if(merge(u , v , 0)) {
            ver[u].pb(v);
            ver[v].pb(u);
        }
        else if(merge(u , v , 1)) {
            ver[u].pb(v);
            ver[v].pb(u);
        }
    }
    ms(par , 0);
    for(int i = 1 ; i <= n ; i ++)
        if(!mark[i])
            DFS(i);

	return 0;
}

Compilation message

pipes.cpp: In function 'int main()':
pipes.cpp:83:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   83 |     for(int i = 1 ; i <= n ; i ++)
      |     ^~~
pipes.cpp:87:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   87 |  return 0;
      |  ^~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3412 KB Output is correct
2 Incorrect 2 ms 3412 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 3796 KB Output is correct
2 Incorrect 4 ms 3632 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 80 ms 3788 KB Output is correct
2 Incorrect 84 ms 3596 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 167 ms 4296 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 222 ms 5604 KB Output is correct
2 Correct 191 ms 5280 KB Output is correct

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 364 ms 9872 KB Output is correct
2 Runtime error 291 ms 25292 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 482 ms 10884 KB Output is correct
2 Runtime error 529 ms 24256 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 637 ms 12748 KB Output is correct
2 Runtime error 672 ms 18596 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 785 ms 12688 KB Output is correct
2 Runtime error 842 ms 16608 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 925 ms 12192 KB Output is correct
2 Runtime error 919 ms 23772 KB Memory limit exceeded
3 Halted 0 ms 0 KB -