Submission #1205251

#	Time	Username	Problem	Language	Result	Execution time	Memory
1205251		lrnnz	Arranging Shoes (IOI19_shoes)	C++20	10 / 100	0 ms	328 KiB

shoes

#include <bits/stdc++.h>
#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include "shoes.h"
using namespace std;
 
#define all(a) (a).begin(), (a).end()
#define sz(a) (int)(a).size()
#define ll long long
#define ld long double
#define ui uint64_t
#define cont(set, element) ((set).find(element) != (set).end())
 
/********* DEBUG *********/
 
template <typename T>
void outvec(const vector<T>& Z){
    for (const T& x : Z)
    cout << x << ' ';
    cout << "\n";
}
void printVariable(const any& var) {
    if (!var.has_value()) {
        cout << "null";
        return;
    }

    if (var.type() == typeid(int)) {
        cout << any_cast<int>(var);
    } else if (var.type() == typeid(double)) {
        cout << any_cast<double>(var);
    } else if (var.type() == typeid(float)) {
        cout << any_cast<float>(var);
    } else if (var.type() == typeid(char)) {
        cout << any_cast<char>(var);
    } else if (var.type() == typeid(bool)) {
        cout << (any_cast<bool>(var) ? "true" : "false");
    } else if (var.type() == typeid(string)) {
        cout << any_cast<string>(var);
    } else if (var.type() == typeid(const char*)) {
        cout << any_cast<const char*>(var);
    } else if (var.type() == typeid(long long)) {
        cout << any_cast<long long>(var);
    } else {
        cout << "[unknown type]";
    }
}

template<typename... Args>
void outval(Args... args) {
    vector<any> variables = {args...};
    
    for (size_t i = 0; i < variables.size(); ++i) {
        printVariable(variables[i]);
        if (i != variables.size() - 1) {
            cout << " ";
        }
    }
    cout << "\n";
}

#define nl "\n"
#define sp << " " <<

/********* DEBUG *********/

const ll MOD = 1000000007;
const ll inf = 1e18;
const ll mxN = 100005;

struct fenwick {
    vector<ll> bit;
    ll n;

    fenwick(ll sz){
        n = sz;
        bit.assign(n, 0);
    }

    fenwick(vector<ll> const &a) : fenwick(a.size()) {
        for (size_t i = 0; i < a.size(); i++){
            add(i, a[i]);
        }
    };

    ll sum(ll r){
        ll ans = 0;
        for (; r >= 0; r = (r & (r + 1)) - 1)
            ans += bit[r];
        return ans;
    }

    ll rangesum(ll l, ll r){
        return sum(r) - sum(l-1);
    }

    void add(ll idx, ll delta){
        for (; idx < n; idx = idx | (idx + 1))
            bit[idx] += delta;
    }
}; 



long long count_swaps(vector<int> s) {
    ll ans = 0, need = 0, n = s.size();

    fenwick bit(n);

    vector<vector<ll>> l(n/2+1), r(n/2+1);
    vector<ll> ptrs(n/2+1, 0);
    vector<bool> dn(n);

    for (int i = 0; i < n; i++){
        if (s[i] < 0){
            l[abs(s[i])].push_back(i);
        }
        else{
            r[s[i]].push_back(i);
        }
    }

    for (int i = 0; i < n; i++){
        if (dn[i])
            continue;

        ll ptr = ptrs[abs(s[i])];
        ptrs[abs(s[i])]++;

        if (s[i] < 0){
            s[i] *= -1;
            
            ll idl = l[s[i]][ptr], idr = r[s[i]][ptr];
            dn[idr] = true;

            ll xl = bit.sum(n-idl-1);
            ll xr = bit.sum(n-idr-1);

            bit.add(idl, 1);
            idl += xl;
            idr += xr;
            
            ans += idr-idl-1;
        }
        else{
            ll idl = l[s[i]][ptr], idr = r[s[i]][ptr];
            dn[idl] = true;
            
            ll xl = bit.sum(n-idl-1);
            ll xr = bit.sum(n-idr-1);
            
            bit.add(idr, 1);
            idl += xl;
            idr += xr;

            ans += idl-idr;
        }
    }

	return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15