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>
#include "highway.h"
using namespace std;
using ll = long long;
void find_pair(int N, vector<int> U, vector<int> V, int A, int B) {
int M = size(U), x = 0, u;
vector<int> w(M);
ll least = ask(w), d[2][N];
for(int b = 1<<17; b/=2; ) if(x + b < M) {
for(int i = 0; i < M; i++)
w[i] = i < x + b;
fill(begin(w), begin(w) + x + b, 1);
if(ask(w) == least) x |= b;
}
array<int, 2> S = {U[x], V[x]}, ans {};
vector<array<int, 2>> g[N];
vector<int> ord[2], a;
for(int i = x; i < M; i++) {
g[U[i]].push_back({V[i], i});
g[V[i]].push_back({U[i], i});
}
for(int k : {0, 1}) {
fill(d[k], d[k] + N, 1e18);
queue<int> q;
d[k][S[k]] = 0;
q.push(S[k]);
while(!empty(q)) {
ord[k].push_back(u = q.front()); q.pop();
for(auto &[v, e] : g[u]) if(d[k][v] > d[k][u] + 1)
d[k][v] = d[k][u] + 1, q.push(v);
}
}
for(int k : {0, 1}) {
a.clear();
for(int i : ord[k])
if(d[k][i] < d[!k][i]) a.push_back(i);
for(int b = 1<<17; b/=2; ) if(ans[k] + b < size(a)) {
for(int i = 0; i < M; i++)
w[i] = i < x;
for(int i = ans[k] + b; --i >= 0; )
for(auto &[v, e] : g[a[size(a)-1-i]])
w[e] = 1;
if(ask(w) == least) ans[k] |= b;
}
ans[k] = a[size(a)-1-ans[k]];
}
answer(ans[0], ans[1]);
}
Compilation message (stderr)
highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:46:44: warning: comparison of integer expressions of different signedness: 'std::array<int, 2>::value_type' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
46 | for(int b = 1<<17; b/=2; ) if(ans[k] + b < size(a)) {
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