oj.uz

Submission #30011

# Submission time Handle Problem Language Result Execution time Memory
30011 2017-07-21T12:06:37 Z PrOAhMeT 007 (CEOI14_007) C++14
100 / 100
 586 ms 23276 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,dd[MAXN],tmp[MAXN];
bool vis[MAXN];
pii edge[600005];
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) {

	if(vis[x])
		return;
	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",&edge[i].st,&edge[i].nd);
		++dd[edge[i].st];
		++dd[edge[i].nd];
	}
	for(int i=1;i<=n;++i)
		v[i].resize(dd[i]);
	for(int i=0;i<m;++i) {
		x=edge[i].st;
		y=edge[i].nd;
		v[y][tmp[y]++]=x;
		v[x][tmp[x]++]=y;
	}
	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:26:16: 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:43:15: 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:68:6: warning: unused variable 'l' [-Wunused-variable]
  int l=0,r=n,ans=-1,md;
      ^
007.cpp:68:10: warning: unused variable 'r' [-Wunused-variable]
  int l=0,r=n,ans=-1,md;
          ^
007.cpp:68:14: warning: unused variable 'ans' [-Wunused-variable]
  int l=0,r=n,ans=-1,md;
              ^
007.cpp:68:21: warning: unused variable 'md' [-Wunused-variable]
  int l=0,r=n,ans=-1,md;
                     ^
007.cpp:53:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&n,&m);
                      ^
007.cpp:54:34: 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:56:41: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&edge[i].st,&edge[i].nd);
                                         ^

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 16280 KB Output is correct
2 Correct 0 ms 16280 KB Output is correct
3 Correct 0 ms 16280 KB Output is correct
4 Correct 0 ms 16280 KB Output is correct
5 Correct 0 ms 16280 KB Output is correct
6 Correct 0 ms 16280 KB Output is correct
7 Correct 0 ms 16280 KB Output is correct
8 Correct 3 ms 16280 KB Output is correct
9 Correct 0 ms 16280 KB Output is correct
10 Correct 0 ms 16280 KB Output is correct
11 Correct 0 ms 16280 KB Output is correct
12 Correct 3 ms 16280 KB Output is correct
13 Correct 0 ms 16280 KB Output is correct
14 Correct 3 ms 16280 KB Output is correct
15 Correct 0 ms 16280 KB Output is correct
16 Correct 0 ms 16280 KB Output is correct
17 Correct 0 ms 16280 KB Output is correct
18 Correct 0 ms 16280 KB Output is correct
19 Correct 3 ms 16280 KB Output is correct
20 Correct 0 ms 16280 KB Output is correct
21 Correct 0 ms 16280 KB Output is correct
22 Correct 0 ms 16280 KB Output is correct
23 Correct 0 ms 16280 KB Output is correct
24 Correct 3 ms 16280 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 17600 KB Output is correct
2 Correct 29 ms 18128 KB Output is correct
3 Correct 23 ms 17600 KB Output is correct
4 Correct 29 ms 18260 KB Output is correct
5 Correct 23 ms 17468 KB Output is correct
6 Correct 9 ms 17732 KB Output is correct
7 Correct 19 ms 17864 KB Output is correct
8 Correct 23 ms 17864 KB Output is correct
9 Correct 39 ms 17864 KB Output is correct
10 Correct 143 ms 20768 KB Output is correct
11 Correct 46 ms 19184 KB Output is correct
12 Correct 66 ms 19844 KB Output is correct
13 Correct 76 ms 19316 KB Output is correct
14 Correct 89 ms 18920 KB Output is correct
15 Correct 93 ms 19976 KB Output is correct
16 Correct 163 ms 20108 KB Output is correct
17 Correct 136 ms 19712 KB Output is correct
18 Correct 139 ms 19712 KB Output is correct
19 Correct 233 ms 19844 KB Output is correct
20 Correct 323 ms 21560 KB Output is correct
21 Correct 269 ms 21452 KB Output is correct
22 Correct 186 ms 20636 KB Output is correct
23 Correct 246 ms 21296 KB Output is correct
24 Correct 249 ms 21212 KB Output is correct
25 Correct 226 ms 20900 KB Output is correct
26 Correct 176 ms 20636 KB Output is correct
27 Correct 259 ms 21296 KB Output is correct
28 Correct 193 ms 21296 KB Output is correct
29 Correct 266 ms 20768 KB Output is correct
30 Correct 356 ms 21956 KB Output is correct
31 Correct 333 ms 22292 KB Output is correct
32 Correct 226 ms 21296 KB Output is correct
33 Correct 156 ms 21428 KB Output is correct
34 Correct 293 ms 21692 KB Output is correct
35 Correct 256 ms 21624 KB Output is correct
36 Correct 283 ms 21908 KB Output is correct
37 Correct 369 ms 22352 KB Output is correct
38 Correct 319 ms 22220 KB Output is correct
39 Correct 339 ms 22220 KB Output is correct
40 Correct 413 ms 22088 KB Output is correct
41 Correct 586 ms 23276 KB Output is correct