| Task: | Tunnels |
| Sender: | Raivis |
| Submission time: | 2017-01-22 15:13:52 +0200 |
| Language: | C++ |
| Status: | READY |
| Result: | 100 |
| group | verdict | score |
|---|---|---|
| #1 | ACCEPTED | 16 |
| #2 | ACCEPTED | 31 |
| #3 | ACCEPTED | 53 |
| test | verdict | time | group | |
|---|---|---|---|---|
| #1 | ACCEPTED | 0.04 s | 1 | details |
| #2 | ACCEPTED | 0.04 s | 1 | details |
| #3 | ACCEPTED | 0.05 s | 1 | details |
| #4 | ACCEPTED | 0.05 s | 1 | details |
| #5 | ACCEPTED | 0.05 s | 1 | details |
| #6 | ACCEPTED | 0.04 s | 2 | details |
| #7 | ACCEPTED | 0.04 s | 2 | details |
| #8 | ACCEPTED | 0.03 s | 2 | details |
| #9 | ACCEPTED | 0.04 s | 2 | details |
| #10 | ACCEPTED | 0.04 s | 2 | details |
| #11 | ACCEPTED | 0.23 s | 3 | details |
| #12 | ACCEPTED | 0.15 s | 3 | details |
| #13 | ACCEPTED | 0.11 s | 3 | details |
| #14 | ACCEPTED | 0.07 s | 3 | details |
| #15 | ACCEPTED | 0.07 s | 3 | details |
Code
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll U[100005],A[100005];
ll root(ll x){
if(U[x]==x) return x;
ll r=root(U[x]);
U[x]=r;
return r;
}
void join(ll x,ll y){
ll nx=root(x);
ll ny=root(y);
U[ny]=nx;
}
ll V[100005];
ll V2[100005];
ll M[100005];
int main()
{
//ifstream cin("in.in");
ll n,k,x,y;
cin>>n>>k;
for(ll i=0;i<=n;i++)U[i]=i;
for(ll i=0;i<k;i++){
cin>>x>>y;
x--; y--;
V[x]++;
V2[y]++;
join(x,y);
}
ll r=0;
for(ll i=0;i<n;i++){
ll a=V[i]-V2[i];
if(a<0)a=0;
A[i]=a;
r=r+a;
}
//cout<<r<<"\n";
for(ll i=0;i<n;i++){
ll ro=root(i);
if(M[ro]==0)M[ro]=1;
if(A[i]>0)M[ro]=2;
//cout<<ro<<" "<<M[ro]<<"\n";
}
for(ll i=0;i<n;i++){
if(M[i]==1)r++;
if(V[i]==0 and V2[i]==0)r--;
}
cout<<r;
}
Test details
Test 1
Group: 1
Verdict: ACCEPTED
| input |
|---|
| 10 20 4 5 6 4 5 1 5 9 ... |
| correct output |
|---|
| 11 |
| user output |
|---|
| 11 |
Test 2
Group: 1
Verdict: ACCEPTED
| input |
|---|
| 10 10 7 3 5 2 9 7 1 5 ... |
| correct output |
|---|
| 5 |
| user output |
|---|
| 5 |
Test 3
Group: 1
Verdict: ACCEPTED
| input |
|---|
| 10 5 5 7 3 8 5 8 3 7 ... |
| correct output |
|---|
| 4 |
| user output |
|---|
| 4 |
Test 4
Group: 1
Verdict: ACCEPTED
| input |
|---|
| 10 4 9 1 6 8 7 1 5 7 |
| correct output |
|---|
| 3 |
| user output |
|---|
| 3 |
Test 5
Group: 1
Verdict: ACCEPTED
| input |
|---|
| 10 2 10 6 2 1 |
| correct output |
|---|
| 2 |
| user output |
|---|
| 2 |
Test 6
Group: 2
Verdict: ACCEPTED
| input |
|---|
| 100 200 24 40 25 6 36 93 92 90 ... |
| correct output |
|---|
| 97 |
| user output |
|---|
| 97 |
Test 7
Group: 2
Verdict: ACCEPTED
| input |
|---|
| 100 100 98 37 91 37 60 92 46 27 ... |
| correct output |
|---|
| 60 |
| user output |
|---|
| 60 |
Test 8
Group: 2
Verdict: ACCEPTED
| input |
|---|
| 100 50 74 95 53 72 69 85 14 13 ... |
| correct output |
|---|
| 34 |
| user output |
|---|
| 34 |
Test 9
Group: 2
Verdict: ACCEPTED
| input |
|---|
| 100 40 28 76 10 81 13 52 46 83 ... |
| correct output |
|---|
| 29 |
| user output |
|---|
| 29 |
Test 10
Group: 2
Verdict: ACCEPTED
| input |
|---|
| 100 20 27 35 72 92 56 4 64 80 ... |
| correct output |
|---|
| 18 |
| user output |
|---|
| 18 |
Test 11
Group: 3
Verdict: ACCEPTED
| input |
|---|
| 100000 200000 89244 59358 22943 56710 63331 89437 56581 38400 ... |
| correct output |
|---|
| 102510 |
| user output |
|---|
| 102510 |
Test 12
Group: 3
Verdict: ACCEPTED
| input |
|---|
| 100000 100000 21701 85599 61542 21474 38081 29362 46316 64038 ... |
| correct output |
|---|
| 60593 |
| user output |
|---|
| 60593 |
Test 13
Group: 3
Verdict: ACCEPTED
| input |
|---|
| 100000 50000 86469 4833 16351 35505 59315 33011 95464 16985 ... |
| correct output |
|---|
| 35933 |
| user output |
|---|
| 35933 |
Test 14
Group: 3
Verdict: ACCEPTED
| input |
|---|
| 100000 40000 5392 23534 63204 45619 74330 25925 59678 88427 ... |
| correct output |
|---|
| 30074 |
| user output |
|---|
| 30074 |
Test 15
Group: 3
Verdict: ACCEPTED
| input |
|---|
| 100000 20000 80156 16531 71753 77661 7028 33389 17168 646 ... |
| correct output |
|---|
| 16882 |
| user output |
|---|
| 16882 |