#include <iostream>
#include <vector>
#include <chrono>
#include <random>
#include <cassert>
#include "popa.h"
#include <stack>
std::mt19937 rng((int) std::chrono::steady_clock::now().time_since_epoch().count());
// query(a, b, c, d) gcd[a, b] == gcd[c, d]
const int ms = 1010;
int liml[ms], limr[ms];
int solve(int l, int r, int* Left, int* Right) {
if(l >= r) {
return -1;
}
for(int i = l; i < r; i++) {
if(liml[i] <= l && r <= limr[i]) {
Left[i] = solve(l, i, Left, Right);
Right[i] = solve(i+1, r, Left, Right);
return i;
}
}
assert(0);
}
int solve(int n, int *l, int *r) {
for(int i = 0; i < n; i++) {
l[i] = r[i] = -1;
}
std::vector<int> st;
for(int i = 0; i < n; i++) {
while(!st.empty() && query(st.back(), st.back(), st.back(), i) != 0) {
// [st.back(), i] isn't good for st.back
limr[st.back()] = i;
st.pop_back();
}
liml[i] = st.empty() ? 0 : st.back() + 1;
}
assert(!st.empty());
for(auto val : st) {
limr[i] = n;
}
solve(0, n, l, r);
}
int main() {
std::ios_base::sync_with_stdio(false); std::cin.tie(NULL);
}
Compilation message
popa.cpp: In function 'int solve(int, int*, int*)':
popa.cpp:46:8: error: 'i' was not declared in this scope
46 | limr[i] = n;
| ^
popa.cpp:45:11: warning: unused variable 'val' [-Wunused-variable]
45 | for(auto val : st) {
| ^~~
popa.cpp:35:19: warning: control reaches end of non-void function [-Wreturn-type]
35 | std::vector<int> st;
| ^~
