Submission #743972

#	Time	Username	Problem	Language	Result	Execution time	Memory
743972		drdilyor	Arranging Shoes (IOI19_shoes)	C++17	50 / 100	1069 ms	3520 KiB

shoes

#include <bits/stdc++.h>
#ifdef ONPC
    #include "t_debug.cpp"
#else
    #define debug(...) 42
#endif
using namespace std;
//namespace pbds = __gnu_pbds;
using ll = long long;
const int inf = 1e9;
const ll infl = 1e18;
const int RANDOM = chrono::high_resolution_clock::now().time_since_epoch().count();
mt19937 rng(RANDOM);
template<typename T, typename U> istream& operator>>(istream& is, pair<T, U>& p) { return is >> p.first >> p.second; }
template<typename Cont> int sz(const Cont& cont) { return int(cont.size()); }
const string fileio = "";
constexpr int tests = 1, nmax = 2e5, nlog = __lg(nmax), mod = 1e9+7;

long long count_swaps(std::vector<int> s) {
    int n = s.size();
    vector<int> pr(2*n,-1);
    for (int i = 0; i < n+n; i++) {
        if (s[i] > 0) continue;
        for (int j = 0; j < n+n; j++) {
            if (i == j) continue;
            if (~pr[j]) continue;
            if (-s[j] == s[i]) {
                pr[j] = i;
                pr[i] = j;
                break;
            }
        }
    }
    ll res = 0;
    for (int i = 0; i < n; i++) {
        if (s[i] > 0) continue;
        int a = i, b = pr[i];
        if (a > b) swap(a, b),res++;
        for (int j = a+1; j <= b-1; j++)
            if (pr[j] <= b)
                res++;
    }
    return res;
}

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