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답안 #30008

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
30008 2017-07-21T11:59:32 Z PrOAhMeT 007 (CEOI14_007) C++14
30 / 100
 1000 ms 19932 KB 
#include <bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define pii pair<int,int>
#define LL long long
#define st first
#define nd second
#define endl '\n'
using namespace std;

const int MAXN=200005;
int n,m,dis[4][MAXN],s,d,a,b,t,tt,x,y,mx,aa,mx1;
bool vis[MAXN];
vector<int> v[MAXN];

inline void bfs(int start,int wait,int u) {

	memset(dis[u],-1,sizeof dis[u]);
	queue<int> q;
	dis[u][start]=0;
	q.push(start);
	while(!q.empty()) {
		x=q.front();
		q.pop();
		for(int i=0;i<v[x].size();++i) {
			y=v[x][i];
			if(dis[u][y]==-1) {
				dis[u][y]=dis[u][x]+1;
				q.push(y);
			}
		}
	}

}

inline void go(int x) {

	vis[x]=1;
	mx=max(mx,dis[aa][x]);
	for(int i=0;i<v[x].size();++i) {
		y=v[x][i];
		if(dis[2][y]<dis[2][x]&&dis[3][y]<dis[3][x])
			go(y);
	}

}

int main() {

	scanf("%d %d",&n,&m);
	scanf("%d %d %d %d",&s,&d,&a,&b);
	for(int i=0;i<m;++i) {
		scanf("%d %d",&t,&tt);
		v[t].pb(tt);
		v[tt].pb(t);
	}
	int l=0,r=n,ans=-1,md;
	bfs(d,0,1);
	bfs(s,0,0);
	bfs(a,0,2);
	bfs(b,0,3);
	if(dis[0][a]>dis[1][a]||dis[0][b]>dis[1][b])
		cout<<-1<<endl;
	else if(!((dis[1][a]-dis[0][a]==dis[1][b]-dis[0][b])&&dis[0][a]==dis[0][b])){
		cout<<min(dis[1][a]-dis[0][a],dis[1][b]-dis[0][b])<<endl;
	}
	else {
		aa=0;
		go(s);
		mx1=mx;
		if(vis[a]==0||vis[b]==0) {
			memset(vis,0,sizeof vis);
			mx=0;
			aa=1;
			go(d);
			if(mx<=dis[1][a]-dis[0][a]+mx1)
				cout<<dis[1][a]-dis[0][a]<<endl;
			else cout<<dis[1][a]-dis[0][a]-1<<endl;
		}
		else cout<<dis[1][a]-dis[0][a]<<endl;
	}

}

Compilation message

007.cpp: In function 'void bfs(int, int, int)':
007.cpp:25:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v[x].size();++i) {
                ^
007.cpp: In function 'void go(int)':
007.cpp:40:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<v[x].size();++i) {
               ^
007.cpp: In function 'int main()':
007.cpp:57:6: warning: unused variable 'l' [-Wunused-variable]
  int l=0,r=n,ans=-1,md;
      ^
007.cpp:57:10: warning: unused variable 'r' [-Wunused-variable]
  int l=0,r=n,ans=-1,md;
          ^
007.cpp:57:14: warning: unused variable 'ans' [-Wunused-variable]
  int l=0,r=n,ans=-1,md;
              ^
007.cpp:57:21: warning: unused variable 'md' [-Wunused-variable]
  int l=0,r=n,ans=-1,md;
                     ^
007.cpp:50:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&n,&m);
                      ^
007.cpp:51:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d %d",&s,&d,&a,&b);
                                  ^
007.cpp:53:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&t,&tt);
                        ^

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 10032 KB Output is correct
2 Correct 3 ms 10032 KB Output is correct
3 Correct 3 ms 10032 KB Output is correct
4 Correct 3 ms 10032 KB Output is correct
5 Correct 3 ms 10032 KB Output is correct
6 Correct 0 ms 10032 KB Output is correct
7 Correct 0 ms 10032 KB Output is correct
8 Correct 0 ms 10032 KB Output is correct
9 Correct 0 ms 10032 KB Output is correct
10 Correct 0 ms 10032 KB Output is correct
11 Correct 0 ms 10032 KB Output is correct
12 Correct 0 ms 10032 KB Output is correct
13 Correct 0 ms 10032 KB Output is correct
14 Correct 3 ms 10032 KB Output is correct
15 Correct 3 ms 10032 KB Output is correct
16 Correct 6 ms 10032 KB Output is correct
17 Correct 0 ms 10032 KB Output is correct
18 Correct 3 ms 10032 KB Output is correct
19 Correct 3 ms 10032 KB Output is correct
20 Correct 3 ms 10032 KB Output is correct
21 Correct 0 ms 10032 KB Output is correct
22 Correct 0 ms 10032 KB Output is correct
23 Correct 0 ms 10032 KB Output is correct
24 Correct 3 ms 10032 KB Output is correct

Subtask #2
0.0 / 70.0

# 결과 실행 시간 메모리 Grader output
1 Correct 29 ms 11352 KB Output is correct
2 Correct 39 ms 11880 KB Output is correct
3 Correct 39 ms 11352 KB Output is correct
4 Correct 49 ms 12012 KB Output is correct
5 Correct 26 ms 11220 KB Output is correct
6 Correct 33 ms 11484 KB Output is correct
7 Correct 33 ms 11616 KB Output is correct
8 Correct 33 ms 11616 KB Output is correct
9 Execution timed out 1000 ms 12012 KB Execution timed out
10 Execution timed out 1000 ms 16236 KB Execution timed out
11 Correct 96 ms 12936 KB Output is correct
12 Correct 129 ms 13596 KB Output is correct
13 Correct 83 ms 13068 KB Output is correct
14 Correct 76 ms 12672 KB Output is correct
15 Correct 96 ms 13728 KB Output is correct
16 Correct 119 ms 13860 KB Output is correct
17 Correct 113 ms 13464 KB Output is correct
18 Correct 103 ms 13464 KB Output is correct
19 Execution timed out 1000 ms 14652 KB Execution timed out
20 Execution timed out 1000 ms 17424 KB Execution timed out
21 Correct 86 ms 15256 KB Output is correct
22 Correct 139 ms 14388 KB Output is correct
23 Correct 136 ms 15048 KB Output is correct
24 Correct 139 ms 14996 KB Output is correct
25 Correct 159 ms 14652 KB Output is correct
26 Correct 166 ms 14388 KB Output is correct
27 Correct 106 ms 15048 KB Output is correct
28 Correct 116 ms 15048 KB Output is correct
29 Execution timed out 1000 ms 15840 KB Execution timed out
30 Execution timed out 1000 ms 17952 KB Execution timed out
31 Correct 109 ms 16104 KB Output is correct
32 Correct 106 ms 15048 KB Output is correct
33 Correct 153 ms 15180 KB Output is correct
34 Correct 126 ms 15444 KB Output is correct
35 Correct 179 ms 15432 KB Output is correct
36 Correct 209 ms 15712 KB Output is correct
37 Correct 123 ms 16104 KB Output is correct
38 Correct 226 ms 15972 KB Output is correct
39 Correct 186 ms 15972 KB Output is correct
40 Execution timed out 1000 ms 17688 KB Execution timed out
41 Execution timed out 1000 ms 19932 KB Execution timed out