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Submission #26447

# Submission time Handle Problem Language Result Execution time Memory
26447 2017-06-30T19:12:43 Z samir_droubi Pipes (BOI13_pipes) C++14
100 / 100
 646 ms 56308 KB 
#include <bits/stdc++.h>
using namespace std;
int n,m;
const int mxn=(1e5)+5;
set<pair<int,int> >gr[mxn];
queue<int>q;
long long c[mxn];
int ans[mxn*5];

void run()
{
	while(!q.empty())
	{
		int v=q.front();
		q.pop();
		if(gr[v].empty())continue;

		int u=gr[v].begin()->first;
		int in=gr[v].begin()->second;

		gr[v].clear();
		gr[u].erase({v,in});

		if(gr[u].size()==1)q.push(u);

		ans[in]=2*c[v];
		c[u]-=c[v];
	}
}
long long sm;
int num;
int cnt;
void dfs(int v,int pa)
{
	++num;
	if(num%2)sm+=c[v];
	else sm-=c[v];

	set<pair<int,int > >::iterator it=gr[v].begin();
	for(it;it!=gr[v].end();++it)
	{
		int u=it->first;
		int in=it->second;
		if(u==pa)continue;
		if(cnt==num)
		{
			ans[in]=sm;
			c[u]-=(sm/2);
			c[v]-=(sm/2);
			gr[u].erase({v,in});
			gr[v].erase(it);	
			q.push(v);
			return;
		}
		dfs(u,v);
	}
}
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)
	{
		if(gr[i].size()==1)
			q.push(i);
	}
	run();
	if(n==m)
	{
		for(int i=1;i<=n;++i)
		{
			if(gr[i].empty())continue;
			++cnt;
		}
		if(cnt%2==0)
		{
			puts("0");
			return 0;
		}
		for(int i=1;i<=n;++i)
		{
			if(gr[i].empty())continue;
			dfs(i,i);
			break;
		}
		run();
	}
	for(int i=1;i<=m;++i)
		printf("%d\n",ans[i]);
	return 0;
}

Compilation message

pipes.cpp: In function 'void dfs(int, int)':
pipes.cpp:40:8: warning: statement has no effect [-Wunused-value]
  for(it;it!=gr[v].end();++it)
        ^
pipes.cpp: In function 'int main()':
pipes.cpp:61:39: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
  for(int i=1;i<=n;++i)scanf("%d",&c[i]);
                                       ^
pipes.cpp:60:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
                     ^
pipes.cpp:61:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=n;++i)scanf("%d",&c[i]);
                                        ^
pipes.cpp:65:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&x,&y);
                      ^

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 9448 KB Output is correct
2 Correct 0 ms 9448 KB Output is correct
3 Correct 0 ms 9580 KB Output is correct
4 Correct 139 ms 18952 KB Output is correct
5 Correct 0 ms 9448 KB Output is correct
6 Correct 0 ms 9448 KB Output is correct
7 Correct 3 ms 9448 KB Output is correct
8 Correct 0 ms 9448 KB Output is correct
9 Correct 3 ms 9580 KB Output is correct
10 Correct 0 ms 9580 KB Output is correct
11 Correct 0 ms 9580 KB Output is correct
12 Correct 0 ms 9580 KB Output is correct
13 Correct 109 ms 17104 KB Output is correct
14 Correct 129 ms 18424 KB Output is correct
15 Correct 166 ms 19084 KB Output is correct
16 Correct 126 ms 17632 KB Output is correct
17 Correct 149 ms 18952 KB Output is correct
18 Correct 163 ms 19084 KB Output is correct
19 Correct 126 ms 18820 KB Output is correct
20 Correct 0 ms 9448 KB Output is correct
21 Correct 0 ms 9580 KB Output is correct
22 Correct 163 ms 19084 KB Output is correct
23 Correct 123 ms 17104 KB Output is correct
24 Correct 176 ms 19084 KB Output is correct
25 Correct 126 ms 17368 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 9448 KB Output is correct
2 Correct 3 ms 9580 KB Output is correct
3 Correct 129 ms 18424 KB Output is correct
4 Correct 96 ms 18820 KB Output is correct
5 Correct 113 ms 18556 KB Output is correct
6 Correct 626 ms 56308 KB Output is correct
7 Correct 0 ms 9448 KB Output is correct
8 Correct 0 ms 9448 KB Output is correct
9 Correct 0 ms 9448 KB Output is correct
10 Correct 0 ms 9448 KB Output is correct
11 Correct 3 ms 9448 KB Output is correct
12 Correct 3 ms 9448 KB Output is correct
13 Correct 0 ms 9448 KB Output is correct
14 Correct 0 ms 9448 KB Output is correct
15 Correct 0 ms 9580 KB Output is correct
16 Correct 3 ms 9580 KB Output is correct
17 Correct 0 ms 9580 KB Output is correct
18 Correct 3 ms 9580 KB Output is correct
19 Correct 0 ms 9580 KB Output is correct
20 Correct 0 ms 9580 KB Output is correct
21 Correct 6 ms 9712 KB Output is correct
22 Correct 0 ms 9580 KB Output is correct
23 Correct 126 ms 20228 KB Output is correct
24 Correct 179 ms 22116 KB Output is correct
25 Correct 113 ms 18424 KB Output is correct
26 Correct 89 ms 18820 KB Output is correct
27 Correct 109 ms 18820 KB Output is correct
28 Correct 123 ms 19348 KB Output is correct
29 Correct 469 ms 47068 KB Output is correct
30 Correct 156 ms 21372 KB Output is correct
31 Correct 166 ms 24144 KB Output is correct
32 Correct 143 ms 19880 KB Output is correct
33 Correct 143 ms 18952 KB Output is correct
34 Correct 109 ms 18820 KB Output is correct
35 Correct 139 ms 18820 KB Output is correct
36 Correct 89 ms 18952 KB Output is correct
37 Correct 646 ms 56308 KB Output is correct
38 Correct 149 ms 21584 KB Output is correct
39 Correct 169 ms 19476 KB Output is correct
40 Correct 186 ms 21796 KB Output is correct
41 Correct 99 ms 18820 KB Output is correct
42 Correct 96 ms 18820 KB Output is correct
43 Correct 129 ms 18820 KB Output is correct
44 Correct 89 ms 18556 KB Output is correct
45 Correct 583 ms 51028 KB Output is correct
46 Correct 149 ms 21240 KB Output is correct
47 Correct 159 ms 21900 KB Output is correct
48 Correct 183 ms 23940 KB Output is correct
49 Correct 133 ms 18424 KB Output is correct
50 Correct 96 ms 18820 KB Output is correct
51 Correct 99 ms 18820 KB Output is correct
52 Correct 89 ms 18688 KB Output is correct
53 Correct 543 ms 51820 KB Output is correct
54 Correct 173 ms 20992 KB Output is correct