oj.uz

답안 #72637

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
72637 2018-08-26T12:59:52 Z bnahmad15 Mousetrap (CEOI17_mousetrap) C++17
20 / 100
 1330 ms 102268 KB 
#include <bits/stdc++.h>
#define forn(i,j,n) for(int i = (int)j;i<=(int)n;i++)
#define nfor(i,j,n) for(int i = (int)j;i>=(int)n;i--)
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
const int N = 2000001,LOG = 17;
 
int n,t,m,dep[N],d[N],src;
vector<pair<int,pii> > g[N];
 
int dfs1(int u,int prnt,int depth){
	dep[u] = depth;
	d[u] = depth;
	int ret = 0;
	forn(i,0,g[u].size() - 1){
		int v = g[u][i].second.second;
		if(v == prnt)
			continue;
		int 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(int node,int prnt,int &one,int &two,int in){
	if(node == t)
		return;
	int id = 0;
	while(one <= two && id < g[node].size() && g[node][id].first != 1){
		g[node][id].first = -1;
		if(g[node][id].second.second != prnt)
			one++;
		id++;
	}
	if(in == 1)
		src = node;
	while(id < g[node].size() && g[node][id].first != 1){
		if(g[node][id].second.second != prnt){
			++two;
			dfs(g[node][id].second.second,node,one,two,2);
		}
		id++;
	}
	if(in != 1){
		++one;
		++two;
		return;
	}
	if(id < g[node].size() && g[node][id].first == 1){
		if(g[node][id].second.second != prnt){
			++two;
			dfs(g[node][id].second.second,node,one,two,1);
		}
		id++;
	}
}
int main(){
 
	scanf("%d%d%d",&n,&t,&m);
	forn(i,1,n-1){
		int u,v;
		scanf("%d%d",&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());
	}
	int one = 0,two = 0;
	dfs(m,0,one,two,1);
	cout<<one;
	return 0;
}

Compilation message

mousetrap.cpp: In function 'void dfs(int, int, int&, int&, int)':
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:42:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(id < g[node].size() && g[node][id].first != 1){
        ~~~^~~~~~~~~~~~~~~~
mousetrap.cpp:54:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(id < g[node].size() && g[node][id].first == 1){
     ~~~^~~~~~~~~~~~~~~~
mousetrap.cpp: In function 'int main()':
mousetrap.cpp:64:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d",&n,&t,&m);
  ~~~~~^~~~~~~~~~~~~~~~~~~
mousetrap.cpp:67:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&u,&v);
   ~~~~~^~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 45 ms 47352 KB Output is correct
2 Correct 51 ms 47384 KB Output is correct
3 Correct 51 ms 47468 KB Output is correct
4 Correct 43 ms 47468 KB Output is correct
5 Correct 53 ms 47528 KB Output is correct
6 Correct 55 ms 47528 KB Output is correct
7 Correct 51 ms 47528 KB Output is correct
8 Correct 44 ms 47528 KB Output is correct
9 Correct 41 ms 47528 KB Output is correct
10 Correct 41 ms 47528 KB Output is correct

Subtask #2
0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 565 ms 102268 KB Output is correct
2 Correct 569 ms 102268 KB Output is correct
3 Incorrect 1330 ms 102268 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 45 ms 47352 KB Output is correct
2 Correct 51 ms 47384 KB Output is correct
3 Correct 51 ms 47468 KB Output is correct
4 Correct 43 ms 47468 KB Output is correct
5 Correct 53 ms 47528 KB Output is correct
6 Correct 55 ms 47528 KB Output is correct
7 Correct 51 ms 47528 KB Output is correct
8 Correct 44 ms 47528 KB Output is correct
9 Correct 41 ms 47528 KB Output is correct
10 Correct 41 ms 47528 KB Output is correct
11 Incorrect 46 ms 102268 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 45 ms 47352 KB Output is correct
2 Correct 51 ms 47384 KB Output is correct
3 Correct 51 ms 47468 KB Output is correct
4 Correct 43 ms 47468 KB Output is correct
5 Correct 53 ms 47528 KB Output is correct
6 Correct 55 ms 47528 KB Output is correct
7 Correct 51 ms 47528 KB Output is correct
8 Correct 44 ms 47528 KB Output is correct
9 Correct 41 ms 47528 KB Output is correct
10 Correct 41 ms 47528 KB Output is correct
11 Correct 565 ms 102268 KB Output is correct
12 Correct 569 ms 102268 KB Output is correct
13 Incorrect 1330 ms 102268 KB Output isn't correct
14 Halted 0 ms 0 KB -