제출 #963709

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
963709		Ivo_12	Paprike (COI18_paprike)	C++98	100 / 100	57 ms	23632 KiB

paprike

#include <bits/stdc++.h>
#define ll long long
#define pb push_back

using namespace std;

struct node {
	vector < int > chi;
	int par = -1;
	ll val = 0;
};

const int N = 100010;
node tree[N];
int n;
int k;
vector < int > edges[N];
int sol;

void dfs( int pos ) {
	for(int i = 0; i < edges[pos].size(); i++) {
		if(edges[pos][i]!=tree[pos].par) {
			tree[edges[pos][i]].par=pos;
			tree[pos].chi.pb(edges[pos][i]);
			dfs(edges[pos][i]);
		}
	}
}

ll sumover( int pos ) {
	vector < ll > chivals;
	ll total = tree[pos].val;
	for(int i = 0; i < tree[pos].chi.size(); i++) {
		chivals.pb(sumover(tree[pos].chi[i]));
		total+=chivals[i];
	}
	sort(chivals.begin(), chivals.end());
	while(total>k) {
		total-=(*--chivals.end());
		chivals.pop_back();
		sol++;
	}
	return total;
}

int main ( void ) {

	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin >> n >> k;
	for(int i = 0; i < n; i++) {
		cin >> tree[i].val;
	}
	int a, b;
	for(int i = 0; i < n-1; i++) {
			cin >> a >> b;
			edges[--a].pb(--b);
			edges[b].pb(a);
	}
	dfs(0);
	sumover(0);
	cout << sol;

	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

paprike.cpp: In function 'void dfs(int)':
paprike.cpp:21:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |  for(int i = 0; i < edges[pos].size(); i++) {
      |                 ~~^~~~~~~~~~~~~~~~~~~
paprike.cpp: In function 'long long int sumover(int)':
paprike.cpp:33:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |  for(int i = 0; i < tree[pos].chi.size(); i++) {
      |                 ~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 13 / 13
• Subtask 3: 27 / 27
• Subtask 4: 49 / 49