#include "island.h"
#include <bits/stdc++.h>
using namespace std;
int cnt;
map<pair<int, int>, int> m;
void ae(int x, int y){
if(x>y) swap(x,y);
if(m[{x,y}]==0){
m[{x,y}]=1;
answer(x,y);
cnt++;
}
}
void solve(int N, int L) {
int fir[N+1]{};
int cur=N;
cnt=0;
set<int> s;
while(cnt<N-1){
for(int i=1; i<N; i++){
int las=fir[cur];
if(!(i==1 && fir[cur]!=0)) las=query(cur, i);
if(las>cur) break;
if(i==1 && fir[cur]==0){
fir[cur]=las;
ae(cur, las);
}
if(!fir[las]){
fir[las]=query(las, 1);
ae(las, fir[las]);
}
if(fir[las]==cur) continue;
if(s.find(las)!=s.end()) break;
ae(cur, las);
s.insert(fir[las]);
}
s.clear();
cur--;
}
}
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