Submission #1264614

#	Time	Username	Problem	Language	Result	Execution time	Memory
1264614		tminh	Synchronization (JOI13_synchronization)	C++20	0 / 100	36 ms	2628 KiB

synchronization

#include "bits/stdc++.h"
using namespace std;

#define task ""
#define ll long long
#define endl '\n'
#define u first
#define v second
#define vall(a) (a).begin(), (a).end()
#define sze(a) (int)a.size()
#define pii pair<int, int>
#define pll pair<ll, ll>


#define ep emplace_back
#define pb push_back
#define pf push_front


const ll mod = 1e9 + 7;
const int N = 1e6 + 5;
const ll oo = 1e18;

bool START;

int n, m, par[N], sz[N], szz[N], q;
pii e[N];
bool vis[N];

// so lan doc sol roi moi biet lam :
int find(int v) {
	return (v == par[v] ? v : par[v] = find(par[v]));
}

void merge(int a, int b) {
	int A = find(a);
	int B = find(b);
	
	if (A != B) {		
		szz[a] += sz[B];
		szz[b] += sz[A];
		
		if (sz[A] < sz[B]) swap(A, B);
		par[B] = A;
		sz[A] += sz[B];  
	}
}

inline void solve() {
	for (int i = 1; i <= n; ++i) {
		sz[i] = szz[i] = 1;
		par[i] = i;
	}
	for (int i = 1; i <= m; ++i) {
		int x; cin >> x;
		if (vis[x]) continue;
		merge(e[x].u, e[x].v);
	}
	while(q--) {
		int x; cin >> x;
		cout << szz[x] << endl;
	}
}


inline void input() {
    cin >> n >> m >> q;
    for (int i = 1; i < n; ++i) cin >> e[i].u >> e[i].v;
    return solve();
}
bool END;

int main() {
    if(fopen(task ".inp", "r")) {
        freopen(task ".inp", "r", stdin);
        freopen(task ".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);

    input();
    
    
    cerr << endl << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << 's' << endl;
    cerr << "Memory: " << fabs ((&END - &START)) / 1048576.0 << "MB\n";
    return 0;
}

Compilation message (stderr)

synchronization.cpp: In function 'int main()':
synchronization.cpp:75:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |         freopen(task ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
synchronization.cpp:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen(task ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 10
• Subtask 4: 0 / 20
• Subtask 5: 0 / 40