| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 70958 |
2018-08-23T20:33:39 Z |
spencercompton |
007 (CEOI14_007) |
C++17 |
|
409 ms |
103804 KB |
#include <bits/stdc++.h>
using namespace std;
vector<int> adj[200000];
int n, m;
vector<int> use1;
vector<int> use2;
vector<bool> v;
vector<int> bfs(int src){
vector<int> li;
vector<int> ret;
ret.resize(n);
for(int i = 0; i<n; i++){
ret[i] = -1;
}
li.push_back(src);
ret[src] = 0;
for(int i = 0; i<n; i++){
int now = li[i];
for(int j = 0; j<adj[now].size(); j++){
int to = adj[now][j];
if(ret[to]==-1){
ret[to] = ret[now]+1;
li.push_back(to);
}
}
}
return ret;
}
int dfs(int now){
int ret = 1;
v[now] = true;
for(int i = 0; i<adj[now].size(); i++){
int to = adj[now][i];
if(use1[now]-1==use1[to] && use2[to]==use1[to] && !v[to]){
ret = max(ret, 1 + dfs(to));
}
}
return ret;
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
cin >> n >> m;
int s, d, h1, h2;
cin >> s >> d >> h1 >> h2;
s--;
d--;
h1--;
h2--;
for(int i = 0; i<m; i++){
int a, b;
cin >> a >> b;
a--;
b--;
adj[a].push_back(b);
adj[b].push_back(a);
}
vector<int> d1 = bfs(h1);
vector<int> d2 = bfs(h2);
int dest = -1;
if(d1[d]!=d2[d]){
if(d1[d]<d2[d]){
dest = 1;
}
else{
dest = 2;
}
}
if(d1[s]!=d2[s]){
if(d1[s]<d2[s]){
dest = 2;
}
else{
dest = 1;
}
}
int dif1 = d1[d]-d1[s];
int dif2 = d2[d]-d2[s];
if(dest!=-1){
int z = min(dif1,dif2);
if(z<-1){
z = -1;
}
cout << z << endl;
return 0;
}
else{
int ans = -1;
use1 = d1;
use2 = d2;
v.clear();
v.resize(n);
int a = dfs(d);
v.clear();
v.resize(n);
int b = dfs(s);
for(int i = 0; i<=n; i++){
if(i+b<a){
if(i+d1[s]+1<=d1[d]){
ans = i;
}
}
else{
if(i+d1[s]<=d1[d]){
ans = i;
}
}
}
cout << ans << endl;
}
}
Compilation message
007.cpp: In function 'std::vector<int> bfs(int)':
007.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j = 0; j<adj[now].size(); j++){
~^~~~~~~~~~~~~~~~
007.cpp: In function 'int dfs(int)':
007.cpp:32:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i = 0; i<adj[now].size(); i++){
~^~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
4984 KB |
Output is correct |
| 2 |
Correct |
7 ms |
5232 KB |
Output is correct |
| 3 |
Correct |
7 ms |
5392 KB |
Output is correct |
| 4 |
Correct |
7 ms |
5392 KB |
Output is correct |
| 5 |
Correct |
6 ms |
5392 KB |
Output is correct |
| 6 |
Correct |
8 ms |
5392 KB |
Output is correct |
| 7 |
Correct |
6 ms |
5392 KB |
Output is correct |
| 8 |
Correct |
7 ms |
5392 KB |
Output is correct |
| 9 |
Correct |
7 ms |
5408 KB |
Output is correct |
| 10 |
Correct |
7 ms |
5408 KB |
Output is correct |
| 11 |
Correct |
7 ms |
5432 KB |
Output is correct |
| 12 |
Correct |
8 ms |
5432 KB |
Output is correct |
| 13 |
Correct |
8 ms |
5484 KB |
Output is correct |
| 14 |
Correct |
7 ms |
5484 KB |
Output is correct |
| 15 |
Correct |
7 ms |
5484 KB |
Output is correct |
| 16 |
Correct |
7 ms |
5504 KB |
Output is correct |
| 17 |
Correct |
7 ms |
5524 KB |
Output is correct |
| 18 |
Correct |
7 ms |
5532 KB |
Output is correct |
| 19 |
Correct |
8 ms |
5624 KB |
Output is correct |
| 20 |
Correct |
7 ms |
5624 KB |
Output is correct |
| 21 |
Correct |
7 ms |
5624 KB |
Output is correct |
| 22 |
Correct |
8 ms |
5740 KB |
Output is correct |
| 23 |
Correct |
7 ms |
5740 KB |
Output is correct |
| 24 |
Correct |
8 ms |
5740 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
29 ms |
8072 KB |
Output is correct |
| 2 |
Correct |
40 ms |
9652 KB |
Output is correct |
| 3 |
Correct |
43 ms |
9652 KB |
Output is correct |
| 4 |
Correct |
52 ms |
11080 KB |
Output is correct |
| 5 |
Correct |
39 ms |
11080 KB |
Output is correct |
| 6 |
Correct |
30 ms |
11176 KB |
Output is correct |
| 7 |
Correct |
34 ms |
11924 KB |
Output is correct |
| 8 |
Correct |
41 ms |
12488 KB |
Output is correct |
| 9 |
Correct |
50 ms |
13880 KB |
Output is correct |
| 10 |
Correct |
178 ms |
23504 KB |
Output is correct |
| 11 |
Correct |
82 ms |
23504 KB |
Output is correct |
| 12 |
Correct |
97 ms |
24276 KB |
Output is correct |
| 13 |
Correct |
65 ms |
24796 KB |
Output is correct |
| 14 |
Correct |
70 ms |
25044 KB |
Output is correct |
| 15 |
Correct |
140 ms |
27948 KB |
Output is correct |
| 16 |
Correct |
105 ms |
29636 KB |
Output is correct |
| 17 |
Correct |
73 ms |
30444 KB |
Output is correct |
| 18 |
Correct |
141 ms |
31744 KB |
Output is correct |
| 19 |
Correct |
163 ms |
35596 KB |
Output is correct |
| 20 |
Correct |
285 ms |
43784 KB |
Output is correct |
| 21 |
Correct |
130 ms |
44592 KB |
Output is correct |
| 22 |
Correct |
114 ms |
45216 KB |
Output is correct |
| 23 |
Correct |
127 ms |
48096 KB |
Output is correct |
| 24 |
Correct |
152 ms |
49900 KB |
Output is correct |
| 25 |
Correct |
137 ms |
51360 KB |
Output is correct |
| 26 |
Correct |
111 ms |
52852 KB |
Output is correct |
| 27 |
Correct |
138 ms |
55684 KB |
Output is correct |
| 28 |
Correct |
170 ms |
57692 KB |
Output is correct |
| 29 |
Correct |
213 ms |
61436 KB |
Output is correct |
| 30 |
Correct |
286 ms |
68996 KB |
Output is correct |
| 31 |
Correct |
161 ms |
70560 KB |
Output is correct |
| 32 |
Correct |
158 ms |
71032 KB |
Output is correct |
| 33 |
Correct |
124 ms |
73452 KB |
Output is correct |
| 34 |
Correct |
148 ms |
75900 KB |
Output is correct |
| 35 |
Correct |
126 ms |
77952 KB |
Output is correct |
| 36 |
Correct |
147 ms |
80428 KB |
Output is correct |
| 37 |
Correct |
167 ms |
83764 KB |
Output is correct |
| 38 |
Correct |
165 ms |
85816 KB |
Output is correct |
| 39 |
Correct |
192 ms |
88204 KB |
Output is correct |
| 40 |
Correct |
249 ms |
94492 KB |
Output is correct |
| 41 |
Correct |
409 ms |
103804 KB |
Output is correct |
