Submission #583684

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
583684	2022-06-26 04:31:24	joelau	Arranging Shoes (IOI19_shoes)	C++14	100 / 100	116 ms	17800 KiB

shoes

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#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
long long N, ft[200005];
vector<long long> lst1[100005], lst2[100005];
priority_queue< pair<long long,long long>, vector< pair<long long,long long> >, greater< pair<long long,long long> > > pq;
void update (long long x, long long v) {
  x++;
  while (x <= N*2) ft[x] += v, x += x & -x;
}
long long query (long long x) {
  x++;
  long long ans = 0;
  while (x) ans += ft[x], x -= x & -x;
  return ans;
}
long long count_swaps(vector<int> s) {
  N = s.size()/2;
  memset(ft,0,sizeof(ft));
  for (long long i = 1; i < N*2; ++i) update(i,1);
  for (long long i = 0; i < N*2; ++i) {
    if (s[i] < 0) lst1[-s[i]-1].push_back(i);
    else lst2[s[i]-1].push_back(i);
  }
  for (long long i = 0; i < N; ++i) if (!lst1[i].empty() && !lst2[i].empty()) {
    reverse(lst1[i].begin(),lst1[i].end()), reverse(lst2[i].begin(),lst2[i].end());
 
 
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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