Submission #26388

#	Time	Username	Problem	Language	Result	Execution time	Memory
26388		samir_droubi	Pipes (BOI13_pipes)	C++14	44.07 / 100	676 ms	55916 KiB

pipes

#include <bits/stdc++.h>
using namespace std;
int n,m;
const int mxn=(1e5)+5;
int c[mxn];
set<pair<int,int> > s;
set<pair<int,int> >gr[mxn];
int ans[mxn*5];
int main()
{
	scanf("%d%d",&n,&m);
	for(int i=1;i<=n;++i)
		scanf("%d",&c[i]);
	for(int i=1;i<=m;++i)
	{
		int x,y;
		scanf("%d%d",&x,&y);
		gr[x].insert({y,i});
		gr[y].insert({x,i});
	}
	if(m>=n)
	{
		puts("0");
		return 0;
	}
	for(int i=1;i<=n;++i)
		s.insert({gr[i].size(),i});
	while(!s.empty())
	{
		int v=s.begin()->second;
		int u=gr[v].begin()->first;
		int in=gr[v].begin()->second;
		s.erase(s.begin());
		gr[u].erase({v,in});
		ans[in]=2*c[v];
		c[u]-=c[v];
	}
	for(int i=1;i<=m;++i)printf("%d\n",ans[i]);
	return 0;
}

Compilation message (stderr)

pipes.cpp: In function 'int main()':
pipes.cpp:11:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
                     ^
pipes.cpp:13:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&c[i]);
                    ^
pipes.cpp:17:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&x,&y);
                      ^

• Subtask 1: 0 / 30
• Subtask 2: 44.074074074074076 / 70