제출 #105762

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
105762		Pro_ktmr	Fireworks (APIO16_fireworks)	C++14	19 / 100	103 ms	15232 KiB

fireworks

#include"bits/stdc++.h"
using namespace std;
#define LL long long
#define REP(i, n) for(int (i)=0; (i)<(n); (i)++)
#define PB push_back
#define MP make_pair
#define MOD 1000000007

int N, M;
vector<pair<int, LL>> edge[300001];
int par[300001];
vector<pair<int, LL>> chi[300001];
vector<pair<int, int>> node;
LL a[300001] ={}, b[300001] ={};

void dfs(int now, int p){
	for(int i=0; i<edge[now].size(); i++){
		if(edge[now][i].first == p) continue;
		chi[now].PB(MP(edge[now][i].first, edge[now][i].second));
		par[edge[now][i].first] = now;
		dfs(edge[now][i].first, now);
	}
}

int d[300001] ={};
int depth(int now){
	if(now == 0) return 0;
	if(d[now] != 0) return d[now];
	return d[now] = depth(par[now]) + 1;
}

LL dp[300][301];
LL solve(int now, LL cost){
	if(dp[now][cost] != -1) return dp[now][cost];
	if(chi[now].size() == 0 && cost != 0) return dp[now][cost] = INT_MAX;
	LL ans = 0;
	for(int i=0; i<chi[now].size(); i++){
		LL tmp = LLONG_MAX;
		for(LL j=0; j<=300; j++){
			if(j > cost) continue;
			LL t = abs(cost-j - chi[now][i].second);
			tmp = min(tmp, t + solve(chi[now][i].first, j));
		}
		ans += tmp;
	}
	return dp[now][cost] = ans;
}

int main(){
	scanf("%d%d", &N, &M);
	for(int i=0; i<N+M-1; i++){
		int P;
		LL C;
		scanf("%d%lld", &P, &C);
		P--;
		edge[i+1].PB(MP(P, C));
		edge[P].PB(MP(i+1, C));
	}

	par[0] = -1;
	dfs(0, -1);

	for(int i=0; i<N+M; i++){
		for(int j=0; j<=300; j++){
			dp[i][j] = -1;
		}
	}

	LL ans = LLONG_MAX;
	for(int i=0; i<=300; i++){
		//cout << solve(0, i) << endl;
		ans = min(ans, solve(0,i));
	}
	cout << ans << endl;
}

컴파일 시 표준 에러 (stderr) 메시지

fireworks.cpp: In function 'void dfs(int, int)':
fireworks.cpp:17:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<edge[now].size(); i++){
               ~^~~~~~~~~~~~~~~~~
fireworks.cpp: In function 'long long int solve(int, long long int)':
fireworks.cpp:37:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<chi[now].size(); i++){
               ~^~~~~~~~~~~~~~~~
fireworks.cpp: In function 'int main()':
fireworks.cpp:50:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &N, &M);
  ~~~~~^~~~~~~~~~~~~~~~
fireworks.cpp:54:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%lld", &P, &C);
   ~~~~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 19 / 19
• Subtask 3: 0 / 29
• Subtask 4: 0 / 45