oj.uz

답안 #309562

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
309562 2020-10-03T19:42:18 Z bigg Mousetrap (CEOI17_mousetrap) C++14
0 / 100
 44 ms 11512 KB 
#include<bits/stdc++.h>
using namespace std;
const int MAXN = 1e5 + 10;
vector<int> grafo[MAXN];
int dp[MAXN];

pair<int, int > inserts(int x, pair<int, int> p){
	if(x >= p.first) swap(p.first, p.second), p.first = x;
	else if(x > p.second) p.second = x;
	return p;
}

void dfs(int x, int p){
	pair<int, int> p_ = make_pair(-1, -1);
	for(int i = 0; i < grafo[x].size(); i++){
		int viz = grafo[x][i];
		if(viz == p) continue;
		dfs(viz, x);
		p_ = inserts(dp[viz], p_);
	}

	if(grafo[x].size() == 1) dp[x] = 0;
	else{
		dp[x] = grafo[x].size() == 2 ? 1 : p_.second + grafo[x].size() - 1;
	}
	printf("%d\n", dp[x]);
}
int n, t, m;
int main(){
	scanf("%d %d %d", &n, &t, &m);
	if(n == 1 || t == m){
		printf("0\n");
		return 0;
	}
	for(int i = 1; i < n; i++){
		int u, v;
		scanf("%d %d", &u, &v);
		grafo[u].push_back(v);
		grafo[v].push_back(u);
	}
	dfs(t, 0);
	printf("%d\n",dp[m] );
}

Compilation message

mousetrap.cpp: In function 'void dfs(int, int)':
mousetrap.cpp:15:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |  for(int i = 0; i < grafo[x].size(); i++){
      |                 ~~^~~~~~~~~~~~~~~~~
mousetrap.cpp: In function 'int main()':
mousetrap.cpp:30:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   30 |  scanf("%d %d %d", &n, &t, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
mousetrap.cpp:37:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   37 |   scanf("%d %d", &u, &v);
      |   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 2688 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 44 ms 11512 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 2688 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 2688 KB Output isn't correct
2 Halted 0 ms 0 KB -