Submission #1172549

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1172549	2025-03-23 23:01:26	versesrev	Arranging Shoes (IOI19_shoes)	C++20	0 / 100	0 ms	324 KiB

shoes

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// 22:48
#include <vector>
#include <unordered_map>
#include <queue>
long long count_swaps(std::vector<int> ss) {
  int n2 = ss.size();
  int n = n2 / 2;
  std::unordered_map<int, std::queue<int>> poss;
  for (int i = 0; i < n2; ++i) {
    poss[ss[i]].push(i);
  }
  
  std::vector<int> tree(n + 1, 0);
  auto update = [&](int pos, int val) {
    ++pos;
    for (; pos <= n; pos += (pos & -pos)) {
      tree[pos] += val;
    }
  };
  auto query = [&](int pos) {
    ++pos;
    int r = 0;
    for (; pos > 0; pos -= (pos & -pos)) {
      r += tree[pos];
    }
    return r;
  };
  auto range_query = [&](int le, int ri) {
    if (ri < le) return 0;
 
 
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