제출 #127182

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
127182		wilwxk	Mergers (JOI19_mergers)	C++14	0 / 100	129 ms	45556 KiB

mergers

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

const int MAXN=5e5+5;
vector<int> g[MAXN];
map<int, int> mp[MAXN];
int cor[MAXN], contc[MAXN];
int n, x, respf;

void dfs(int cur, int p) {
	mp[cur][cor[cur]]++;
	for(auto viz : g[cur]) {
		if(viz==p) continue;
		dfs(viz, cur);
		if(mp[viz].size()>mp[cur].size()) swap(mp[cur], mp[viz]);
		for(auto mit : mp[viz]) {
			mp[cur][mit.first]+=mit.second;
			if(mp[cur][mit.first]==contc[mit.first]) mp[cur].erase(mit.first);
		}
	}
	if(mp[cur][cor[cur]]==contc[cor[cur]]) mp[cur].erase(cor[cur]);
	// for(auto mit : mp[cur]) printf("%d: %d %d\n", cur, mit.first, mit.second);
	if(!mp[cur].size()) respf++;
}

int main() {
	scanf("%d %d", &n, &x);
	for(int i=1; i<n; i++) {
		int a, b; scanf("%d %d", &a, &b);
		g[a].push_back(b);
		g[b].push_back(a);
	}
	for(int i=1; i<=n; i++) {
		scanf("%d", &cor[i]);
		contc[cor[i]]++;
	}
	dfs(1, 1);

	printf("%d\n", (respf+1)/2);
}

컴파일 시 표준 에러 (stderr) 메시지

mergers.cpp: In function 'int main()':
mergers.cpp:27:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &x);
  ~~~~~^~~~~~~~~~~~~~~~~
mergers.cpp:29:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int a, b; scanf("%d %d", &a, &b);
             ~~~~~^~~~~~~~~~~~~~~~~
mergers.cpp:34:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &cor[i]);
   ~~~~~^~~~~~~~~~~~~~~

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