Submission #143209

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
143209	2019-08-13 11:03:37	mlyean00	Arranging Shoes (IOI19_shoes)	C++14	100 / 100	291 ms	140196 KiB

shoes

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#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
#include "shoes.h"
using namespace std;
using ll = long long;
int sgn(int x) {
    if (x == 0) return 0;
    return x > 0 ? 1 : -1;
}
ll count_inversions(vector<int>& v, int l, int r) {
    if (r - l == 1) return 0;
    int mid = (l + r) / 2;
    ll ans = count_inversions(v, l, mid) + count_inversions(v, mid, r);
    int l_ptr = l, r_ptr = mid;
    vector<int> m;
    m.reserve(r - l);
    while (l_ptr < mid || r_ptr < r) {
        if (l_ptr == mid) {
            m.push_back(v[r_ptr++]);
        } else if (r_ptr == r) {
            ans += r_ptr - mid;
            m.push_back(v[l_ptr++]);
        } else if (v[l_ptr] <= v[r_ptr]) {
 
 
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• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 15 / 15