Submission #365497

#	Time	Username	Problem	Language	Result	Execution time	Memory
365497		tfg	popa (BOI18_popa)	C++17	100 / 100	135 ms	556 KiB

popa

#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 query(int a, int b, int c, int d);

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;
		st.push_back(i);
	}
	assert(!st.empty());
	for(auto val : st) {
		limr[val] = n;
	}
	return solve(0, n, l, r);
}

/*int values[ms];
int ansL[ms], ansR[ms];

int query(int l, int r) {
	int ans = 0;
	for(int i = l; i <= r; i++) {
		int x = values[i];
		while(x != 0) {
			ans %= x;
			std::swap(ans, x);
		}
	}
	std::cout << "query(" << l << ", " << r << ") = " << ans << '\n';
	return ans;
}

int query(int a, int b, int c, int d) {
	int ans = query(a, b) == query(c, d);
	std::cout << "query(" << a << ", " << b << ", " << c << ", " << d << ") = " << ans << '\n';
	return ans;
}

int main() {
	std::ios_base::sync_with_stdio(false); std::cin.tie(NULL);
	int n;
	std::cin >> n;
	for(int i = 0; i < n; i++) {
		std::cin >> values[i];
	}
	std::cout << solve(n, ansL, ansR) << '\n';
	for(int i = 0; i < n; i++) {
		std::cout << ansL[i] << ", " << ansR[i] << "\n";
	}
}*/

• Subtask 1: 37 / 37
• Subtask 2: 24 / 24
• Subtask 3: 39 / 39