Submission #894667

#	Time	Username	Problem	Language	Result	Execution time	Memory
894667		lunaTu	Bubble Sort 2 (JOI18_bubblesort2)	C++17	38 / 100	9067 ms	2060 KiB

bubblesort2

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ff first
#define ss second
#define all(x) x.begin(), x.end()
#include "bubblesort2.h"
typedef long long ll;
using namespace std;
using namespace __gnu_pbds;

typedef tree<
int,
null_type,
less<int>,
rb_tree_tag,
tree_order_statistics_node_update>
ordered_set;

const int N = 5e4 + 1;
int A[N];
int ans[N];

int add(int n, int i, int x) {
    int mx = 0;
    for (int j = i + 1; j < n; j++) {
        if (A[j] < A[i]) ans[j]--;
        if (A[j] < x) ans[j]++;

        mx = max(mx, ans[j]);
    }

    ans[i] = 0;
    for (int j = i - 1; j >= 0; j--) {
        if (A[j] > x) ans[i]++;

        mx = max(mx, ans[j]);
    }

    A[i] = x;
    return max(mx, ans[i]);
}

vector<int> countScans(vector<int> a, vector<int> x, vector<int> v){
    int n = a.size();
    for (int i = 0; i < n; i++) {
        int w = add(n, i, a[i]);
    }

	int q = x.size();

	vector<int> answer(q);

	for (int j = 0; j < q; j++) answer[j] = add(n, x[j], v[j]);

	return answer;
}

Compilation message (stderr)

bubblesort2.cpp: In function 'std::vector<int> countScans(std::vector<int>, std::vector<int>, std::vector<int>)':
bubblesort2.cpp:47:13: warning: unused variable 'w' [-Wunused-variable]
   47 |         int w = add(n, i, a[i]);
      |             ^

• Subtask 1: 17 / 17
• Subtask 2: 21 / 21
• Subtask 3: 0 / 22
• Subtask 4: 0 / 40