제출 #1261590

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1261590		am_aadvik	3개의 봉우리 (IOI25_triples)	C++20	54.05 / 100	2093 ms	243928 KiB

triples

#include <iostream>
#include <vector>
#include <algorithm>
#include <unordered_set>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
using namespace std;

int64_t pack(int i, int j, int k) {
	return ((int64_t)i << 40) | ((int64_t)j << 20) | ((int64_t)k);
}
void sort3(int &a0, int &a1, int &a2) {
	if (a0 > a1) swap(a0, a1);
	if (a1 > a2) swap(a1, a2);
	if (a0 > a1) swap(a0, a1);
}
void sort4(int& a0, int& a1, int& a2, int &a3) {
	if (a0 > a1) swap(a0, a1);
	if (a2 > a3) swap(a2, a3);
	if (a0 > a2) swap(a0, a2);
	if (a1 > a3) swap(a1, a3);
	if (a1 > a2) swap(a1, a2);
}
void check(int i, int j, int k, vector<int>&a  \
	, unordered_set<int64_t> &s) {
	vector<int> x = { j - i, k - i, k - j };
	vector<int> y = { a[i], a[j], a[k] };
	sort3(x[0], x[1], x[2]);
	sort3(y[0], y[1], y[2]);
	#pragma GCC unroll 3
	for (int i = 0; i < 3; ++i)
		if (x[i] != y[i]) return;
	s.insert(pack(i, j, k));
}
void findi(int j, int k, vector<int>&a  \
	, unordered_set<int64_t> &ms) {
	if ((k < 0) || ((k >= a.size()))) return;
	if ((j < 0) || ((j >= a.size()))) return;
	vector<int> op = { j - a[j],
		k - a[k], j - a[k], k - a[j] };
	sort4(op[0], op[1], op[2], op[3]);
	op.erase(unique(op.begin(), op.end()), op.end());
	for (auto i : op)
		if ((i >= 0) && (i < a.size()))
			if ((k + a[k]) == (j + a[j]))
				check(i, j, k, a, ms);
}
void findk(int i, int j, vector<int>& a  \
	, unordered_set<int64_t> &ms) {
	if ((j < 0) || ((j >= a.size()))) return;
	if ((i < 0) || ((i >= a.size()))) return;
	vector<int> op = { i + a[i],
		j + a[i], i + a[j], j + a[j] };
	sort4(op[0], op[1], op[2], op[3]);
	op.erase(unique(op.begin(), op.end()), op.end());
	for (auto k : op)
		if ((k >= 0) && (k < a.size()))
			if ((k + a[k]) == (j + a[j]))
				check(i, j, k, a, ms);
}
long long count_triples(vector<int> a) {
	unordered_set<int64_t> ans;
	int n = a.size();
	ans.reserve(max(1, n * 2));
	for (int x = 0; x < n; ++x)
		for (auto y : { x - a[x], x + a[x]})
			if (!((y < 0) || ((y >= a.size())))) {
				vector<int> op = { x - a[x], x + a[x], y + a[y], y - a[y],
					y + a[x], y - a[x], x + a[y], x - a[y] };
					sort(op.begin(), op.end());
					op.erase(unique(op.begin(), op.end()), op.end());
				for (auto z : op) {
					if ((z < 0) || ((z >= a.size()))) continue;
					vector<int> op = { x, y, z }; 
					sort3(op[0], op[1], op[2]);
					check(op[0], op[1], op[2], a, ans);
				}
			}
	vector<vector<int>> x(n + n), y(n + n);
	for (int i = 0; i < n; ++i)
		x[a[i] - i + n].push_back(i);
	for (int i = 0; i < n; ++i)
		y[a[i] + i].push_back(i);
	for (int j = 0; j < n; ++j) {
		if (x[a[j] - j + n].size() < y[a[j] + j].size())
			for (auto i : x[a[j] - j + n])
				findk(i, j, a, ans);
		else 
			for (auto k : y[a[j] + j])
				findi(j, k, a, ans);
	}
	return (int)ans.size();
}
vector<int> construct_range(int M, int K) {
	vector<int> a = { 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 }; return a;
}
//int main() { vector<int> a = { 4, 1, 4, 3, 2, 6, 1 }; cout << count_triples(a); }

• Subtask 0: 0 / 0
• Subtask 1: 8 / 8
• Subtask 2: 6 / 6
• Subtask 3: 10 / 10
• Subtask 4: 11 / 11
• Subtask 5: 16 / 16
• Subtask 6: 0 / 19
• Subtask 7: 3 / 5
• Subtask 8: 0.045 / 5
• Subtask 9: 0.0018 / 5
• Subtask 10: 0.0001 / 5
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• Subtask 12: 0 / 5