Submission #104748

#	Time	Username	Problem	Language	Result	Execution time	Memory
104748		antimirage	Mergers (JOI19_mergers)	C++14	0 / 100	3080 ms	30272 KiB

mergers

#include <bits/stdc++.h>

#define fr first
#define sc second
#define mk make_pair
#define pb push_back
#define all(s) s.begin(), s.end()

using namespace std;

const int N = 5e5 + 5;

int n, k, x, y, s[N], d[N][55], cnt[N], ans, tin[N], tout[N], timer;

vector < vector <int> > g;

vector <int> vec;

void dfs (int v, int p = 0){
	
	tin[v] = ++timer;
	
	d[v][ s[v] ]++;

	for (auto to : g[v]){
	
		if (to == p) continue;
		dfs(to, v);
		
		for (int j = 1; j <= k; j++)
			d[v][j] += d[to][j];
	}
	bool fl = 1;
	
	for (int j = 1; j <= k; j++){
		if (d[v][j] > 0 && d[v][j] < cnt[j])
			fl = 0;
	}
	if (fl && v != 1)
		vec.pb( v );
		
	tout[v] = ++timer;
}
inline bool upper (int a, int b)
{
	return tin[a] <= tin[b] && tout[b] <= tout[a];
}
main(){
	
	cin >> n >> k;
	g.resize(n + 1);
	
	for (int i = 1; i < n; i++){
		scanf("%d%d", &x, &y);
		g[x].pb(y);
		g[y].pb(x);
	}
	for (int i = 1; i <= n; i++){
		scanf("%d", &s[i]);
		cnt[ s[i] ]++; 
	}
	dfs(1);
	
	for (int i = 0; i < (int)vec.size(); i++){
	
		if ( !upper(vec.back(), vec[i]) ){
			vec.pop_back();
			ans++;
		}
		else
			ans++;
	}
	cout << ans << endl;
}
/**
5 4
1 2
2 3
3 4
3 5
1
2
1
3
4

5 4
1 2
2 3
3 4
4 5
1
2
3
4
1
**/

Compilation message (stderr)

mergers.cpp:48:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
mergers.cpp: In function 'int main()':
mergers.cpp:54:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &x, &y);
   ~~~~~^~~~~~~~~~~~~~~~
mergers.cpp:59:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &s[i]);
   ~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 24
• Subtask 3: 0 / 14
• Subtask 4: 0 / 22
• Subtask 5: 0 / 30