#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
const int MOD=1e9+7;
int n,k;
vector<int> adj[300001],rev[300001];
struct node{
node *l,*r;
//left node stores stuff which can reach m
//right node stores stuff which m can reach
int s,m,e;
unordered_set<int> stuff;
node(int ss,int ee){
s=ss;
e=ee;
m=(s+e)/2;
if (s<e){
l=new node(s,m);
r=new node(m+1,e);
for (int i=s;i<=m;i++) l->stuff.insert(i);
for (int i=m;i<=e;i++) r->stuff.insert(i);
}
if (s==e){
l=new node(s,-1);
r=new node(s,-1);
l->stuff.insert(s);
r->stuff.insert(s);
}
}
bool upd(int u,int v){
if (e==-1) return false;
/*
cout<<"update "<<s<<' '<<m<<' '<<e<<' '<<u<<' '<<v<<'\n';
cout<<"left: ";
for (auto i:l->stuff) cout<<i<<' ';
cout<<'\n';
cout<<"right: ";
for (auto i:r->stuff) cout<<i<<' ';
cout<<'\n';
*/
bool uleft=(l->stuff.find(u)!=l->stuff.end());
bool uright=(r->stuff.find(u)!=r->stuff.end());
bool vleft=(l->stuff.find(v)!=l->stuff.end());
bool vright=(r->stuff.find(v)!=r->stuff.end());
if (uright){
if (vleft) return true;
if (vright) return r->upd(u,v);
r->stuff.insert(v);
if (r->upd(u,v)) return true;
for (auto i:adj[v]){
if (upd(v,i)) return true;
}
}
if (vleft){
if (uleft) return l->upd(u,v);
l->stuff.insert(u);
if (l->upd(u,v)) return true;
for (auto i:rev[u]){
if (upd(i,u)) return true;
}
}
return false;
}
}*root;
void init(int N,int K){
n=N;
k=K;
for (int i=1;i<k;i++){
//adj[i].pb(i+1);
//rev[i+1].pb(i);
}
root=new node(1,k);
}
int add_teleporter(int u,int v){
u++;
v++;
adj[u].pb(v);
rev[v].pb(u);
if (u>=v && u<=k) return 1;
if (u==v) return 0;
return root->upd(u,v);
}
void runtc(){
int N,M,K;
cin>>N>>M>>K;
init(N,K);
for (int i=1;i<=M;i++){
int u,v;
cin>>u>>v;
//cout<<i<<' '<<add_teleporter(u,v)<<'\n';
if (add_teleporter(u,v)==1) cout<<i<<'\n';
}
}
int main(){
//ios_base::sync_with_stdio(false);
//cin.tie(NULL);
freopen("input1.in","r",stdin);
//freopen("output1.out","w",stdout);
int tc;
//cin>>tc;
tc=1;
for (int i=1;i<=tc;i++){
//cout<<"Case #"<<i<<": ";
runtc();
}
}
Compilation message
game.cpp: In function 'int main()':
game.cpp:99:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
99 | freopen("input1.in","r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccsLGEht.o: in function `main':
stub.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cce1v1ls.o:game.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status
