#include <bits/stdc++.h>
#include "highway.h"
using namespace std;
typedef long long ll;
const int MN = 150005;
ll m, st, lo, hi, mm, i, x, y, vis[MN], s, t, d[MN], u[MN]; vector<int> q;
map<pair<ll,ll>,ll> id;
vector<ll> adj[MN], tr[MN], ls;
queue<ll> qq;
void sett(ll l){
for(int i=0;i<q.size();i++)
q[i]=(i<=l);
}
void dfs(ll n){
for(auto v : tr[n]){
ls.push_back(id[{v, n}]);
d[v] = d[n]+1; dfs(v);
}
}
void find_pair(int N, vector<int> U, vector<int> V, int A, int B){
A = B = 0; m = U.size();
for(i=0;i<m;i++) q.push_back(0);
for(i=0;i<m;i++){
x = U[i], y = V[i];
id[{x,y}]=id[{y,x}]=i;
adj[x].push_back(y);
adj[y].push_back(x);
}
st = ask(q);
lo = 0, hi = m;
while(lo<hi){
ll m = lo+hi>>1;
sett(m);
bool heh = (ask(q)==st);
if(heh) lo=m+1;
else hi=m;
}
mm = lo-1; sett(mm);
x = U[mm+1], y = V[mm+1];
qq.push(x); qq.push(y); vis[x]=vis[y]=1;
while(qq.size()){
x = qq.front(); qq.pop();
for(auto v : adj[x]){
if(id[{x,v}]>mm&&!vis[v]){
vis[v] = 1;
qq.push(v);
tr[x].push_back(v);
u[id[{x,v}]]=1;
}
}
}
for (int i = 0; i <= n; i++) random_shuffle(tr[i].begin(), tr[i].end());
u[mm+1]=1;
x = U[mm+1], y = V[mm+1];
dfs(x);
lo = 0; hi = ls.size();
while(lo<hi){
ll mmm = lo+hi>>1;
for(i=0;i<m;i++) q[i]=!u[i];
for(i=mmm;i<ls.size();i++) q[ls[i]]=1;
bool heh = (ask(q)==st);
if(heh) hi=mmm;
else lo=mmm+1;
}
if(lo==0){
s = U[mm+1];
}
else{
x = U[ls[lo-1]], y = V[ls[lo-1]];
if(d[x]>d[y]) s = x;
else s = y;
}
ls.clear();
x = U[mm+1], y = V[mm+1];
dfs(y);
lo = 0; hi = ls.size();
while(lo<hi){
ll mmm = lo+hi>>1;
for(i=0;i<m;i++) q[i]=!u[i];
for(i=mmm;i<ls.size();i++) q[ls[i]]=1;
bool heh = (ask(q)==st);
if(heh) hi=mmm;
else lo=mmm+1;
}
if(lo==0){
t = V[mm+1];
}
else{
x = U[ls[lo-1]], y = V[ls[lo-1]];
if(d[x]>d[y]) t = x;
else t = y;
}
answer(s, t);
}
Compilation message
highway.cpp: In function 'void sett(ll)':
highway.cpp:12:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<q.size();i++)
~^~~~~~~~~
highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:33:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
ll m = lo+hi>>1;
~~^~~
highway.cpp:53:24: error: 'n' was not declared in this scope
for (int i = 0; i <= n; i++) random_shuffle(tr[i].begin(), tr[i].end());
^
highway.cpp:59:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
ll mmm = lo+hi>>1;
~~^~~
highway.cpp:61:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(i=mmm;i<ls.size();i++) q[ls[i]]=1;
~^~~~~~~~~~
highway.cpp:79:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
ll mmm = lo+hi>>1;
~~^~~
highway.cpp:81:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(i=mmm;i<ls.size();i++) q[ls[i]]=1;
~^~~~~~~~~~
