oj.uz

Submission #108855

# Submission time Handle Problem Language Result Execution time Memory
108855 2019-05-02T10:08:08 Z fjzzq2002 Mousetrap (CEOI17_mousetrap) C++14
45 / 100
 1511 ms 80908 KB 
#include <iostream>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <string>
#include <bitset>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <algorithm>
#include <sstream>
#include <stack>
#include <iomanip>
#include <assert.h>
using namespace std;
#define pb push_back
#define mp make_pair
typedef pair<int,int> pii;
typedef long long ll;
typedef double ld;
typedef vector<int> vi;
#define fi first
#define se second
#define fe first
#define FO(x) {freopen(#x".in","r",stdin);freopen(#x".out","w",stdout);}
#define Edg int M=0,fst[SZ],vb[SZ],nxt[SZ];void ad_de(int a,int b){++M;nxt[M]=fst[a];fst[a]=M;vb[M]=b;}void adde(int a,int b){ad_de(a,b);ad_de(b,a);}
#define Edgc int M=0,fst[SZ],vb[SZ],nxt[SZ],vc[SZ];void ad_de(int a,int b,int c){++M;nxt[M]=fst[a];fst[a]=M;vb[M]=b;vc[M]=c;}void adde(int a,int b,int c){ad_de(a,b,c);ad_de(b,a,c);}
#define es(x,e) (int e=fst[x];e;e=nxt[e])
#define esb(x,e,b) (int e=fst[x],b=vb[e];e;e=nxt[e],b=vb[e])
#define SZ 2000555
int n,t,m,fa[SZ],f[SZ]; Edg
vector<int> so[1000555];
void dfs(int x)
{
	for esb(x,e,b)
		if(b!=fa[x]) fa[b]=x,so[x].pb(b),dfs(b);
}
bool sp[SZ];
void dp(int x)
{
	if(x==m)
	{
		f[x]=0;
		return;
	}
	for esb(x,e,b)
		if(b!=fa[x]) dp(b);
	vector<ll> ss;
	for esb(x,e,b)
		if(b!=fa[x])
		{
			if(!sp[b])
				ss.pb(f[b]+1+so[x].size()-2-sp[x]); //???
			else
				ss.pb(f[b]);
		}
	sort(ss.begin(),ss.end(),greater<ll>());
	if(ss.size()==0) f[x]=0;
	else if(ss.size()==1) f[x]=!sp[x];
	else f[x]=ss[1]+1;
	if(sp[x]) f[x]-=so[x].size()-1;
//	cout<<x<<"w"<<f[x]<<"\n";
}
int main()
{
	scanf("%d%d%d",&n,&m,&t);
	for(int i=1;i<n;++i)
	{
		int a,b;
		scanf("%d%d",&a,&b);
		adde(a,b);
	}
	dfs(t);
	ll ans=0;
	if(t==m)
	{
		puts("0");
		return 0;
	}
	for(int j=m;;j=fa[j])
	{
		sp[j]=1;
		if(j!=m)
			ans+=so[j].size()-1;
		if(j==t) break;
	}
//	cerr<<"CA:"<<ans<<"\n";
	dp(t); ans+=f[t];
	printf("%lld\n",ans);
}

Compilation message

mousetrap.cpp: In function 'int main()':
mousetrap.cpp:69:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d",&n,&m,&t);
  ~~~~~^~~~~~~~~~~~~~~~~~~
mousetrap.cpp:73:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&a,&b);
   ~~~~~^~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 23808 KB Output is correct
2 Correct 26 ms 23844 KB Output is correct
3 Correct 23 ms 23936 KB Output is correct
4 Correct 24 ms 23936 KB Output is correct
5 Correct 28 ms 23936 KB Output is correct
6 Correct 24 ms 23988 KB Output is correct
7 Correct 26 ms 23928 KB Output is correct
8 Correct 25 ms 23900 KB Output is correct
9 Correct 24 ms 23932 KB Output is correct
10 Correct 23 ms 23904 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 500 ms 80348 KB Output is correct
2 Correct 375 ms 74692 KB Output is correct
3 Correct 1355 ms 80760 KB Output is correct
4 Correct 551 ms 52344 KB Output is correct
5 Correct 1511 ms 80800 KB Output is correct
6 Correct 1396 ms 80908 KB Output is correct

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 23808 KB Output is correct
2 Correct 26 ms 23844 KB Output is correct
3 Correct 23 ms 23936 KB Output is correct
4 Correct 24 ms 23936 KB Output is correct
5 Correct 28 ms 23936 KB Output is correct
6 Correct 24 ms 23988 KB Output is correct
7 Correct 26 ms 23928 KB Output is correct
8 Correct 25 ms 23900 KB Output is correct
9 Correct 24 ms 23932 KB Output is correct
10 Correct 23 ms 23904 KB Output is correct
11 Correct 25 ms 23928 KB Output is correct
12 Correct 24 ms 23936 KB Output is correct
13 Correct 23 ms 23936 KB Output is correct
14 Correct 22 ms 24192 KB Output is correct
15 Correct 22 ms 23936 KB Output is correct
16 Correct 23 ms 23936 KB Output is correct
17 Incorrect 28 ms 23928 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 23808 KB Output is correct
2 Correct 26 ms 23844 KB Output is correct
3 Correct 23 ms 23936 KB Output is correct
4 Correct 24 ms 23936 KB Output is correct
5 Correct 28 ms 23936 KB Output is correct
6 Correct 24 ms 23988 KB Output is correct
7 Correct 26 ms 23928 KB Output is correct
8 Correct 25 ms 23900 KB Output is correct
9 Correct 24 ms 23932 KB Output is correct
10 Correct 23 ms 23904 KB Output is correct
11 Correct 500 ms 80348 KB Output is correct
12 Correct 375 ms 74692 KB Output is correct
13 Correct 1355 ms 80760 KB Output is correct
14 Correct 551 ms 52344 KB Output is correct
15 Correct 1511 ms 80800 KB Output is correct
16 Correct 1396 ms 80908 KB Output is correct
17 Correct 25 ms 23928 KB Output is correct
18 Correct 24 ms 23936 KB Output is correct
19 Correct 23 ms 23936 KB Output is correct
20 Correct 22 ms 24192 KB Output is correct
21 Correct 22 ms 23936 KB Output is correct
22 Correct 23 ms 23936 KB Output is correct
23 Incorrect 28 ms 23928 KB Output isn't correct
24 Halted 0 ms 0 KB -