Submission #363942

#	Time	Username	Problem	Language	Result	Execution time	Memory
363942		Vladth11	Arranging Shoes (IOI19_shoes)	C++14	100 / 100	292 ms	207596 KiB

shoes

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define debug(x) cerr << #x << " " << x << "\n"
#define debug_with_space(x) cerr << #x << " " << x << " "
//#include "shoes.h"
 
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair <ll, ll> pii;
typedef pair <ll, pii> piii;
typedef tree <pii, null_type, less <pii>, rb_tree_tag, tree_order_statistics_node_update> OST;
 
const ll NMAX = 300001;
const ll INF = (1LL << 30);
const ll MOD = 1000000007;
const ll BLOCK = 101;
const ll nr_of_bits = 35;
 
queue <int> pz[NMAX];
int v[NMAX];
int aib[NMAX];
 
int n;
 
void update(int x, int v){
    for(int i = x; i <= n; i += i&(-i))
        aib[i] += v;
}
 
int query(int x){
    int v = 0;
    for(int i = x; i > 0; i -= i&(-i))
        v += aib[i];
    return v;
}
 
int cod(int x){
    if(x > 0)
        return x + n;
    else return -x;
}
 
long long count_swaps(vector<int> s) {
    n = s.size();
    for(int i = 0; i < s.size(); i++){
        v[i + 1] = s[i];
        pz[cod(v[i + 1])].push(i + 1);
        update(i + 1, 1);
    }
    ll sol = 0;
    for(int i = 1; i <= n; i++){
        if(pz[cod(v[i])].front() != i)
        continue;
        pz[cod(v[i])].pop();
        if(v[i] < 0)
            update(i, -1);
        int cn = pz[cod(-v[i])].front();
        pz[cod(-v[i])].pop();
        update(cn, -1);
        sol += 1LL * query(cn);
 
        if(v[i] > 0)
            update(i, -1);
    }
    return sol;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:47:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |     for(int i = 0; i < s.size(); i++){
      |                    ~~^~~~~~~~~~

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