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/*
* Author : shora
*/
#include "shoes.h"
#include <bits/stdc++.h>
#define print(_v) for (auto &_ : _v) {cerr << _ << ' ';} cerr << endl;
using namespace std;
using ll = long long;
const int oo = 1e9;
struct BIT {
int n; vector<int> bit;
BIT(int n): n(n) {
bit.resize(n + 1);
}
void update(int i, int x) {
for (; i <= n; i += i & -i)
bit[i] += x;
}
int get(int i) {
int res = 0;
for (; i; i -= i & -i)
res += bit[i];
return res;
}
};
long long count_swaps(std::vector<int> a) {
int n = a.size() / 2;
vector<vector<pair<int, int>>> idx(n + 1);
for (int i = 0; i < a.size(); ++i)
idx[abs(a[i])].emplace_back(a[i], i);
for (int i = 1; i <= n; ++i)
sort(idx[i].begin(), idx[i].end());
ll res = 0;
vector<pair<int, int>> v;
for (auto& p : idx) {
for (int i = 0; i < p.size() / 2; ++i) {
int l = p[i].second, r = p[i + p.size() / 2].second;
if (l > r) swap(l, r), res++;
v.emplace_back(l+1, r+1);
}
}
BIT bit(n*2);
for (int i = 1; i <= n*2; ++i) bit.update(i, 1);
sort(v.begin(), v.end());
for (auto& p : v) {
res += bit.get(p.second-1) - bit.get(p.first);
bit.update(p.first, -1);
bit.update(p.second, -1);
}
return res;
}
컴파일 시 표준 에러 (stderr) 메시지
shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:31:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
31 | for (int i = 0; i < a.size(); ++i)
| ~~^~~~~~~~~~
shoes.cpp:38:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
38 | for (int i = 0; i < p.size() / 2; ++i) {
| ~~^~~~~~~~~~~~~~
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