Submission #110102

#	Time	Username	Problem	Language	Result	Execution time	Memory
110102		nxteru	Fireworks (APIO16_fireworks)	C++14	7 / 100	11 ms	7424 KiB

fireworks

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> P;
#define F first
#define S second
#define PB push_back
ll n,m;
P x[300005],y[300005];
vector<P>g[300005];
void dfs(int v){
	if(g[v].size()==0)return;
	vector<ll>r;
	for(int i=0;i<g[v].size();i++){
		ll u=g[v][i].F,c=g[v][i].S;
		dfs(u);
		x[u].F+=c;
		y[u].F+=c;
		r.PB(x[u].F);
		r.PB(y[u].F);
	}
	sort(r.begin(),r.end());
	x[v].F=r[g[v].size()-1];
	y[v].F=r[g[v].size()];
	for(int i=0;i<g[v].size();i++){
		ll u=g[v][i].F,c=x[u].S;
		x[v].S+=c;
		y[v].S+=c;
		if(x[v].F<x[u].F)x[v].S+=x[u].F-x[v].F;
		if(x[v].F>y[u].F)x[v].S+=x[v].F-y[u].F;
		if(y[v].F<x[u].F)y[v].S+=x[u].F-y[v].F;
		if(y[v].F>y[u].F)y[v].S+=y[v].F-y[u].F;
	}
}
int main(void){
    scanf("%lld%lld",&n,&m);
    n+=m;
    for(int i=1;i<n;i++){
		ll p,c;
		scanf("%lld%lld",&p,&c);
		g[--p].PB(P(i,c));
	}
	dfs(0);
	printf("%lld\n",x[0].S);
}

Compilation message (stderr)

fireworks.cpp: In function 'void dfs(int)':
fireworks.cpp:14:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[v].size();i++){
              ~^~~~~~~~~~~~
fireworks.cpp:25:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[v].size();i++){
              ~^~~~~~~~~~~~
fireworks.cpp: In function 'int main()':
fireworks.cpp:36:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld%lld",&n,&m);
     ~~~~~^~~~~~~~~~~~~~~~~~
fireworks.cpp:40:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld%lld",&p,&c);
   ~~~~~^~~~~~~~~~~~~~~~~~

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