#include <bits/stdc++.h>
#define speed ios_base::sync_with_stdio(0); cin.tie(0)
#define all(x) (x).begin(),(x).end()
#define F first
#define S second
using namespace std;
typedef long long ll;
typedef double db;
typedef long double ldb;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
const ll MAX=1e5+10,P=998244353;
const ll INF=0x3f3f3f3f,oo=0x3f3f3f3f3f3f3f3f;
int n;
vector<pair<string,string> > eg;
int G[MAX];
int main() {
speed;
cin>>n;
vector<string> dct;
for (int i=0;i<n;i++) {
string a,b;
cin>>a>>b;
eg.emplace_back(a,b);
dct.push_back(a);
dct.push_back(b);
}
sort(all(dct));
dct.resize(unique(all(dct))-dct.begin());
for (int i=0;i<n;i++) {
auto [a,b]=eg[i];
int va=lower_bound(all(dct),a)-dct.begin();
int vb=lower_bound(all(dct),b)-dct.begin();
G[va]=vb;
}
if (n&1) {
cout<<"-1\n";
return 0;
}
// if (n<=20) {
// int ans=n;
// for (int st=0;st<(1<<n);st++) {
// bool flag=true;
// vector<int> cnt(n,0);
// for (int i=0;i<n;i++) {
// if (st&(1<<i)) continue;
// if (G[i]==i) {
// flag=false;
// break;
// }
// int tgt=G[i];
// if (G[tgt]==i) continue;
// if (st&(1<<tgt)) {
// if (cnt[tgt]==0) {
// cnt[tgt]++;
// continue;
// }
// }
// flag=false;
// break;
// }
// // if (flag) cout<<st<<"\n";
// if (flag) ans=min(ans,__builtin_popcount(st));
// }
// cout<<ans<<"\n";
// } else {
int ans=0;
for (int i=0;i<n;i++) {
int now=i;
int st=i;
int sz=1;
while (G[now]!=st) {
sz++;
now=G[now];
}
ans+=(sz+1)>>1;
}
cout<<ans<<"\n";
// }
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Execution timed out |
2092 ms |
344 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Execution timed out |
2016 ms |
14616 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Execution timed out |
2092 ms |
344 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |