| Task: | Tunnels |
| Sender: | Wrinx |
| Submission time: | 2017-01-21 19:56:11 +0200 |
| Language: | C++ |
| Status: | READY |
| Result: | 0 |
| group | verdict | score |
|---|---|---|
| #1 | WRONG ANSWER | 0 |
| #2 | WRONG ANSWER | 0 |
| #3 | WRONG ANSWER | 0 |
| test | verdict | time | group | |
|---|---|---|---|---|
| #1 | WRONG ANSWER | 0.06 s | 1 | details |
| #2 | WRONG ANSWER | 0.05 s | 1 | details |
| #3 | WRONG ANSWER | 0.03 s | 1 | details |
| #4 | WRONG ANSWER | 0.05 s | 1 | details |
| #5 | ACCEPTED | 0.04 s | 1 | details |
| #6 | WRONG ANSWER | 0.04 s | 2 | details |
| #7 | WRONG ANSWER | 0.05 s | 2 | details |
| #8 | WRONG ANSWER | 0.03 s | 2 | details |
| #9 | WRONG ANSWER | 0.04 s | 2 | details |
| #10 | WRONG ANSWER | 0.04 s | 2 | details |
| #11 | WRONG ANSWER | 0.13 s | 3 | details |
| #12 | WRONG ANSWER | 0.08 s | 3 | details |
| #13 | WRONG ANSWER | 0.07 s | 3 | details |
| #14 | WRONG ANSWER | 0.05 s | 3 | details |
| #15 | WRONG ANSWER | 0.06 s | 3 | details |
Code
#include<bits/stdc++.h>
#define F first
#define S second
#define ll long long
#define ull unsigned long long
#define pb push_back
using namespace std;
vector < int > g[200000];
int ans, b[200000], used[200000];
set < int > s;
vector < int > k;
void dfs(int v)
{
used[v] = 1;
int t = 0;
for (auto u: g[v])
if (!used[u]){
dfs(u);
break;
}
for (auto u: g[v]){
b[u]--;
if (b[u] == 0) s.insert(u);
}
ans -= t;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int n, m;
cin >> n >> m;
for (int i = 0; i < m; i++){
int u, v;
cin >> u >> v;
g[u].pb(v);
b[v]++;
}
for (int i = 1; i <= n; i++) if (b[i] == 1) k.pb(i);
for (int i = 1; i <= n; i++){
for (auto u: k)
if (!used[u]){
ans++;
dfs(u);
}
k.clear();
for (int i: s)
k.pb(i);
s.clear();
}
cout << ans;
}
Test details
Test 1
Group: 1
Verdict: WRONG ANSWER
| input |
|---|
| 10 20 4 5 6 4 5 1 5 9 ... |
| correct output |
|---|
| 11 |
| user output |
|---|
| 0 |
Test 2
Group: 1
Verdict: WRONG ANSWER
| input |
|---|
| 10 10 7 3 5 2 9 7 1 5 ... |
| correct output |
|---|
| 5 |
| user output |
|---|
| 2 |
Test 3
Group: 1
Verdict: WRONG ANSWER
| input |
|---|
| 10 5 5 7 3 8 5 8 3 7 ... |
| correct output |
|---|
| 4 |
| user output |
|---|
| 1 |
Test 4
Group: 1
Verdict: WRONG ANSWER
| input |
|---|
| 10 4 9 1 6 8 7 1 5 7 |
| correct output |
|---|
| 3 |
| user output |
|---|
| 2 |
Test 5
Group: 1
Verdict: ACCEPTED
| input |
|---|
| 10 2 10 6 2 1 |
| correct output |
|---|
| 2 |
| user output |
|---|
| 2 |
Test 6
Group: 2
Verdict: WRONG ANSWER
| input |
|---|
| 100 200 24 40 25 6 36 93 92 90 ... |
| correct output |
|---|
| 97 |
| user output |
|---|
| 19 |
Test 7
Group: 2
Verdict: WRONG ANSWER
| input |
|---|
| 100 100 98 37 91 37 60 92 46 27 ... |
| correct output |
|---|
| 60 |
| user output |
|---|
| 28 |
Test 8
Group: 2
Verdict: WRONG ANSWER
| input |
|---|
| 100 50 74 95 53 72 69 85 14 13 ... |
| correct output |
|---|
| 34 |
| user output |
|---|
| 20 |
Test 9
Group: 2
Verdict: WRONG ANSWER
| input |
|---|
| 100 40 28 76 10 81 13 52 46 83 ... |
| correct output |
|---|
| 29 |
| user output |
|---|
| 19 |
Test 10
Group: 2
Verdict: WRONG ANSWER
| input |
|---|
| 100 20 27 35 72 92 56 4 64 80 ... |
| correct output |
|---|
| 18 |
| user output |
|---|
| 19 |
Test 11
Group: 3
Verdict: WRONG ANSWER
| input |
|---|
| 100000 200000 89244 59358 22943 56710 63331 89437 56581 38400 ... |
| correct output |
|---|
| 102510 |
| user output |
|---|
| 20837 |
Test 12
Group: 3
Verdict: WRONG ANSWER
| input |
|---|
| 100000 100000 21701 85599 61542 21474 38081 29362 46316 64038 ... |
| correct output |
|---|
| 60593 |
| user output |
|---|
| 22433 |
Test 13
Group: 3
Verdict: WRONG ANSWER
| input |
|---|
| 100000 50000 86469 4833 16351 35505 59315 33011 95464 16985 ... |
| correct output |
|---|
| 35933 |
| user output |
|---|
| 20182 |
Test 14
Group: 3
Verdict: WRONG ANSWER
| input |
|---|
| 100000 40000 5392 23534 63204 45619 74330 25925 59678 88427 ... |
| correct output |
|---|
| 30074 |
| user output |
|---|
| 18708 |
Test 15
Group: 3
Verdict: WRONG ANSWER
| input |
|---|
| 100000 20000 80156 16531 71753 77661 7028 33389 17168 646 ... |
| correct output |
|---|
| 16882 |
| user output |
|---|
| 13080 |