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 "game.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define all(c) c.begin(), c.end()
#define endl "\n"
vector<vector<int>> adj,trans;
void dfs(vector<int>&order, int u,vector<bool>&visited){
visited[u] = 1;
for(int v : adj[u]){
if(!visited[v])dfs(order, v, visited);
}
order.pb(u);
}
void SCC(vector<int>&scc, int u, vector<bool>&visited){
visited[u] = 1;
scc.pb(u);
for(int v : trans[u]){
if(!visited[v])SCC(scc, v, visited);
}
}
int N;
int K;
void init(int n, int k) {
adj.resize(n);
trans.resize(n);
N = n;
K = k;
for(int i = 0;i<=k-2;++i){
adj[i].pb(i+1);
trans[i+1].pb(i);
}
}
int add_teleporter(int u, int v) {
adj[u].pb(v);
trans[v].pb(u);
vector<int>order;
vector<bool>visited(N);
for(int i = 0;i<N;++i){
if(!visited[i]){
dfs(order, i, visited);
}
}
visited.clear();
visited = vector<bool>(N);
for(int i = (int)(order.size()-1);i>=0;--i){
if(!visited[order[i]]){
vector<int>scc;
SCC(scc, order[i], visited);
if(scc.size() > 1){
for(auto x : scc){
if(x<K){
return 1;
}
}
}
}
}
return 0;
}
// int32_t main(){
// init(6,3);
// add_teleporter(3,4);
// add_teleporter(5, 0);
// add_teleporter(4, 5);
// add_teleporter(5, 3);
// add_teleporter(1, 4);
// // init(4,2);
// // add_teleporter(1,1);
// }
/*
edge case
init(6,3);
add_teleporter(5,4);
add_teleporter(4,3);
add_teleporter(3,2);
*/
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