# | TimeUTC-0 | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
999003 | huutuan | Teleporters (IOI08_teleporters) | C++14 | 575 ms | 65536 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
const int N=2e6+10;
int jump[N];
int n, m;
int32_t main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> m;
set<int> st;
for (int i=1; i<=n; ++i){
int u, v; cin >> u >> v;
jump[u]=v; jump[v]=u;
st.insert(u);
st.insert(v);
}
int cnt=0;
int ans=0;
while (st.size()){
int u=*st.begin(); st.erase(st.begin());
int v=jump[u];
st.erase(v);
++ans;
auto it=st.lower_bound(v);
if (it==st.end() || jump[*it]>=*it){
++cnt;
continue;
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