Submission #1180737

#	Time	Username	Problem	Language	Result	Execution time	Memory
1180737		swishy123	Arranging Shoes (IOI19_shoes)	C++20	100 / 100	364 ms	147584 KiB

shoes

#include <iostream>
#include <algorithm>
#include <vector>
#include <random>
#include <chrono>
#include <set>
#include <map>
#include <stack>
#include <functional>
#include <iomanip>
#include <queue>
#include <cassert>
#include <complex>
#include <cstring>
#include <memory>
#include <bitset>
#include <sstream>
#include <cmath>
#include <numeric>
#include <numbers>
#include <fstream>
#include "shoes.h"

using namespace std;

#ifndef template
#ifndef define
 
#define ll long long
#define ld long double
#define pl pair<ll, ll>
#define pi pair<int, int>
#define nl cout << '\n';
#define x first
#define y second 
#define cbit(x) __builtin_popcountll(x)
#define uid(a, b) uniform_int_distribution<ll>(a, b)(rng) 
#define siz(x) (int)x.size()
 
#endif
 
#ifndef print
void print(size_t x) {cout << x << ' ';}
void print(int x) {cout << x << ' ';}
void print(long long x) {cout << x << ' ';}
void print(float x) {cout << x << ' ';}
void print(long double x) {cout << x << ' ';}
void print(char x) {cout << x << ' ';}
void print(const char* x) {cout << x << ' ';}
void print(bool x) {cout << x << ' ';}
void print(string &x) {cout << x << ' ';}
 
template<typename T, typename V>
void print(pair<T, V> &p) {print(p.x); print(p.y);}
template<typename T>
void print(vector<T> v) {for (int i = 0; i < v.size(); i++) print(v[i]);}
template<typename T>
void print(vector<vector<T>> v) {
    for (int i = 0; i < v.size(); i++){
        for (int j = 0; j < v[i].size(); j++)
            print(v[i][j]);
        nl;
    }
}
template <typename T, typename... V>
void print(T t, V&&... v) {print(t); print(v...);}
 
#endif
 
#ifndef read
void read(int &x) {cin >> x;}
void read(long long &x) {cin >> x;}
void read(unsigned &x) {cin >> x;}
void read(unsigned long long &x) {cin >> x;}
void read(float &x) {cin >> x;}
void read(long double &x) {cin >> x;}
void read(char &x) {cin >> x;}
void read(string &x) {cin >> x;}
void read(bool &x) {cin >> x;}
 
template<typename T> 
void read(vector<T> &v) {
    for (int i = 0; i < v.size(); i++)
        read(v[i]);
}
template <typename T, typename... V>
void read(T &t, V&... v) {read(t); read(v...);}
#endif
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<class T> bool maxi(T& a, const T& b) {
    return a < b ? a = b, 1 : 0;
}
template<class T> bool mini(T& a, const T& b) {
    return a > b ? a = b, 1 : 0;
}
template<class... Args>
auto vec(size_t n, Args&&... args) {
    if constexpr(sizeof...(args) == 1)
        return vector(n, args...);
    else
        return vector(n, vec(args...));
}

#endif

using namespace std;
const ll inf = 1e15;
const ll def = 2001;
const ll mod = 998244353;

template<typename T>
struct SegmentTreeFast{
    vector<T> a;
    T defv;
    int n;

    SegmentTreeFast(int n, T defv) : n(n), defv(defv){
        a = vector<T>(2 * n, defv);
    }

    T cmb(T a, T b){ //change if needed
        return a + b;
    }

    void build(){ //array is at i + n index
        for (int i = n - 1; i > 0; --i) 
            a[i] = cmb(a[i << 1], a[i << 1 | 1]);
    } 

    void update(int i, T v){
        for (a[i += n] = v; i > 1; i >>= 1)
            a[i >> 1] = cmb(a[i], a[i ^ 1]);
    }

    T get(int l, int r){
        r++;
        T res = defv;
        for (l += n, r += n; l < r; l >>= 1, r >>= 1){
            if (l&1) res = cmb(res, a[l++]);
            if (r&1) res = cmb(res, a[--r]);
        }

        return res;
    }
};

ll count_swaps(vector<int> S){
    int n = S.size();
    map<int, queue<int>> mp;

    for (int i = 0; i < n; i++)
        mp[S[i]].push(i);
    ll res = 0;
    
    SegmentTreeFast<int> st(n, 0);
    for (int i = 0; i < n; i++){
        if (st.get(i, i))
            continue;
        int u = mp[-S[i]].front(); mp[-S[i]].pop();
        mp[S[i]].pop();

        int dis = u - i - st.get(i, u);
        if (S[i] < 0)
            dis--;

        res += dis;
        st.update(i, 1);
        st.update(u, 1);
    }
    return res;
}

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