| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 739245 | nicolaev | Arranging Shoes (IOI19_shoes) | C++14 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define mod 1000000007
#define ll long long
#define all(v) v.begin(), v.end()
#define fr(n) for(ll i=0;i<n;++i)
#define ctz(x) __builtin_ctzll(x)
#define clz(x) __builtin_clzll(x)
#define pcount(x) __builtin_popcountll(x)
const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, 1, 0, -1};
// #define cin fin
// #define cout fout
// ifstream fin
// ofstream fout
//const ll maxn = 3e5 + 5;
//int f[maxn],nf[maxn],inv[maxn];
//const int M=998244353;
//void init(){
//inv[1]=1; for (int i=2;i<maxn;i++) inv[i]=M-1ll*(M/i)*inv[M%i]%M;
//f[0]=nf[0]=1; for (int i=1;i<maxn;i++) f[i]=1ll*f[i-1]*i%M,nf[i]=1ll*nf[i-1]*inv[i]%M;
//}
//int C(int x,int y){return 1ll*f[x]*nf[y]%M*nf[x-y]%M;}
ll count_swaps(vector<ll> s){
ll n=s.size();
vector< set<ll> > v(n+4);
for(ll i=0; i<n; i++){
if(s[i]<0){
v[abs(s[i])+n/2].insert(i);
}
else v[s[i]].insert(i);
}
ll ans=0;
for(ll i=0; i<n; i++){
if(s[i]<0){
if(v[abs(s[i])+n/2].empty()) continue;
v[abs(s[i])+n/2].erase(i);
set<ll> ::iterator it=v[abs(s[i])].begin();
ans+=*it-i+1;
v[abs(s[i])].erase(it);
}
else{
if(v[s[i]].empty()) continue;
v[s[i]].erase(i);
set<ll> ::iterator it=v[n/2+s[i]].begin();
ans+=*it-i;
v[n/2+s[i]].erase(it);
}
}
return ans;
}