Submission #673485

#	Time	Username	Problem	Language	Result	Execution time	Memory
673485		406	Bubble Sort 2 (JOI18_bubblesort2)	C++17	100 / 100	1820 ms	41940 KiB

bubblesort2

#include "bubblesort2.h"
#include <bits/stdc++.h>
using namespace std;

const int N = 1e6 + 50;
const int INF = 1 << 25;
int mx[4 * N], delta[4 * N];
vector<pair<int, int>> D;

void add(int v, int l, int r, int L, int R, int d) {
	if (R <= L || R <= l || r <= L) return;
	if (l >= L && r <= R) {
		mx[v] += d;
		delta[v] += d;
		return;
	}
	int m = l + r >> 1;
	add(v<<1, l, m, L, R, d);
	add(v<<1|1, m, r, L, R, d);
	mx[v] = max(mx[v<<1], mx[v<<1|1]) + delta[v];
}

vector<int> countScans(vector<int> A, vector<int> X, vector<int> V){
	int Q = X.size();
	int n = A.size();

	D.reserve(Q + n);
	for (int i = 0; i < n; i++)
		D.emplace_back(A[i], i);
	for (int i = 0; i < Q; i++)
		D.emplace_back(V[i], X[i]);
	sort(D.begin(), D.end());
	D.resize(unique(D.begin(), D.end()) - D.begin());

	for (int i = 0; i < A.size(); i++) {
		int ind = lower_bound(D.begin(), D.end(), make_pair(A[i], i)) - D.begin();
		add(1, 0, D.size(), ind, ind + 1, +i);
		add(1, 0, D.size(), ind + 1, D.size(), -1);
	}

	vector<int> answer(Q);
	for (int i = 0; i < Q; i++) {
		int ind = lower_bound(D.begin(), D.end(), make_pair(A[X[i]], X[i])) - D.begin();
		add(1, 0, D.size(), ind, ind + 1, -X[i]);	
		add(1, 0, D.size(), ind + 1, D.size(), +1);

		ind = lower_bound(D.begin(), D.end(), make_pair(V[i], X[i])) - D.begin();
		add(1, 0, D.size(), ind, ind + 1, +X[i]);
		add(1, 0, D.size(), ind + 1, D.size(), -1);

		A[X[i]] = V[i];
		answer[i] = max(mx[1], 0);
	}
	return answer;
}

Compilation message (stderr)

bubblesort2.cpp: In function 'void add(int, int, int, int, int, int)':
bubblesort2.cpp:17:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   17 |  int m = l + r >> 1;
      |          ~~^~~
bubblesort2.cpp: In function 'std::vector<int> countScans(std::vector<int>, std::vector<int>, std::vector<int>)':
bubblesort2.cpp:35:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |  for (int i = 0; i < A.size(); i++) {
      |                  ~~^~~~~~~~~~

• Subtask 1: 17 / 17
• Subtask 2: 21 / 21
• Subtask 3: 22 / 22
• Subtask 4: 40 / 40