Submission #645921

#	Time	Username	Problem	Language	Result	Execution time	Memory
645921		GaLz	Arranging Shoes (IOI19_shoes)	C++14	100 / 100	239 ms	274216 KiB

shoes

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
const ll mod=1e9+7;
const ll maxn=2e5+5;
#define ok ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define fi first
#define se second
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define endl '\n'
int n, fen[maxn], sm, pos, cnt;
queue<int> qul[maxn], qur[maxn];
bool use[maxn];
void add(int bit) {
    for(; bit<=n; bit+=bit&(-bit)) fen[bit]++;
}
int get(int bit) {
    int res=0;
    for(; bit>0; bit-=bit&(-bit)) res+=fen[bit];
    return res;
}
ll count_swaps(vector<int> v) {
    n=(int)v.size();
    ll ans=0;
    for(int i=0; i<n; i++) {
        if(v[i]<0) qul[-1*v[i]].push(i+1);
        else qur[v[i]].push(i+1);
    }
    for(int i=0; i<n; i++) {
        if(use[i+1]) continue;
        if(v[i]<0) {
            sm=-1*v[i];
            pos=qur[sm].front();
            cnt=get(pos)-get(i+1);
            qur[sm].pop();
            qul[sm].pop();
            int range=pos-(i+1)-1-cnt;
            ans+=range;
            add(pos);
            use[pos]=1;
        } else {
            pos=qul[v[i]].front();
            cnt=get(pos)-get(i+1);
            qur[v[i]].pop();
            qul[v[i]].pop();
            int range=pos-(i+1)-cnt;
            ans+=range;
            add(pos);
            use[pos]=1;
        }
    }
    return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 15 / 15