oj.uz

답안 #72641

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
72641 2018-08-26T13:04:02 Z bnahmad15 Mousetrap (CEOI17_mousetrap) C++17
20 / 100
 1439 ms 133692 KB 
#include <bits/stdc++.h>
#define forn(i,j,n) for(ll i = (ll)j;i<=(ll)n;i++)
#define nfor(i,j,n) for(ll i = (ll)j;i>=(ll)n;i--)
using namespace std;
typedef long long ll;
typedef pair<ll,ll> pii;
const ll N = 2000001,LOG = 17;
 
ll n,t,m,dep[N],d[N],src;
vector<pair<ll,pii> > g[N];
 
ll dfs1(ll u,ll prnt,ll depth){
	dep[u] = depth;
	d[u] = depth;
	ll ret = 0;
	forn(i,0,g[u].size() - 1){
		ll v = g[u][i].second.second;
		if(v == prnt)
			continue;
		ll tmp = dfs1(v,u,depth+1);
		ret = max(ret,tmp);
		dep[u] = max(dep[u],dep[v]);
		g[u][i].first = tmp;
		g[u][i].second.first = -dep[v];
	}
	if(u == t)
		return 1;
	return ret;
}
void dfs(ll node,ll prnt,ll &one,ll &two,ll in){
	if(node == t)
		return;
	ll id = 0;
	while(one <= two && id < g[node].size() && g[node][id].first != 1){
		if(g[node][id].second.second != prnt && g[node][id].first != -1)
			one++;
		g[node][id].first = -1;
		id++;
	}
	if(in == 1)
		src = node;
	id = 0;
	while(id < g[node].size() && g[node][id].first != 1){
		if(g[node][id].second.second != prnt && g[node][id].first != -1){
			++two;
			dfs(g[node][id].second.second,node,one,two,2);
		}
		id++;
	}
	if(in != 1){
		++one;
		++two;
		return;
	}
	while(id < g[node].size()){
		if(g[node][id].second.second != prnt && g[node][id].first == 1){
			++two;
			dfs(g[node][id].second.second,node,one,two,1);
		}
		id++;
	}
}
int main(){
 
	scanf("%lld%lld%lld",&n,&t,&m);
	forn(i,1,n-1){
		ll u,v;
		scanf("%lld%lld",&u,&v);
		g[u].push_back(make_pair(0,make_pair(0,v)));
		g[v].push_back(make_pair(0,make_pair(0,u)));
	}
	dfs1(m,0,0);
	forn(i,1,n){
		sort(g[i].begin(),g[i].end());
	}
	ll one = 0,two = 0;
	dfs(m,0,one,two,1);
	cout<<one;
	return 0;
}

Compilation message

mousetrap.cpp: In function 'void dfs(ll, ll, ll&, ll&, ll)':
mousetrap.cpp:34:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(one <= two && id < g[node].size() && g[node][id].first != 1){
                      ~~~^~~~~~~~~~~~~~~~
mousetrap.cpp:43:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(id < g[node].size() && g[node][id].first != 1){
        ~~~^~~~~~~~~~~~~~~~
mousetrap.cpp:55:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(id < g[node].size()){
        ~~~^~~~~~~~~~~~~~~~
mousetrap.cpp: In function 'int main()':
mousetrap.cpp:65:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld%lld",&n,&t,&m);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
mousetrap.cpp:68:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld%lld",&u,&v);
   ~~~~~^~~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 52 ms 47352 KB Output is correct
2 Correct 47 ms 47452 KB Output is correct
3 Correct 51 ms 47540 KB Output is correct
4 Correct 47 ms 47540 KB Output is correct
5 Correct 43 ms 47540 KB Output is correct
6 Correct 52 ms 47540 KB Output is correct
7 Correct 43 ms 47540 KB Output is correct
8 Correct 44 ms 47540 KB Output is correct
9 Correct 48 ms 47540 KB Output is correct
10 Correct 44 ms 47540 KB Output is correct

Subtask #2
0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 662 ms 133692 KB Output is correct
2 Correct 653 ms 133692 KB Output is correct
3 Incorrect 1439 ms 133692 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 52 ms 47352 KB Output is correct
2 Correct 47 ms 47452 KB Output is correct
3 Correct 51 ms 47540 KB Output is correct
4 Correct 47 ms 47540 KB Output is correct
5 Correct 43 ms 47540 KB Output is correct
6 Correct 52 ms 47540 KB Output is correct
7 Correct 43 ms 47540 KB Output is correct
8 Correct 44 ms 47540 KB Output is correct
9 Correct 48 ms 47540 KB Output is correct
10 Correct 44 ms 47540 KB Output is correct
11 Incorrect 46 ms 133692 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 52 ms 47352 KB Output is correct
2 Correct 47 ms 47452 KB Output is correct
3 Correct 51 ms 47540 KB Output is correct
4 Correct 47 ms 47540 KB Output is correct
5 Correct 43 ms 47540 KB Output is correct
6 Correct 52 ms 47540 KB Output is correct
7 Correct 43 ms 47540 KB Output is correct
8 Correct 44 ms 47540 KB Output is correct
9 Correct 48 ms 47540 KB Output is correct
10 Correct 44 ms 47540 KB Output is correct
11 Correct 662 ms 133692 KB Output is correct
12 Correct 653 ms 133692 KB Output is correct
13 Incorrect 1439 ms 133692 KB Output isn't correct
14 Halted 0 ms 0 KB -