Submission #1077353

#TimeUsernameProblemLanguageResultExecution timeMemory
1077353IgnutArranging Shoes (IOI19_shoes)C++17
45 / 100
19 ms3264 KiB
// Ignut

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

ll count_swaps(vector<int> S) {
    ll res = 0;
    int n = S.size();
    // for (int i = 0; i < n; i ++) {
    //     if (i % 2 == 0) {
    //         int j;
    //         for (j = i; j < n; j ++)
    //             if (S[j] < 0) 
    //                 break;
    //         while (j > i) {
    //             swap(S[j - 1], S[j]);
    //             j --;
    //             res ++;
    //         }
    //     }
    //     else {
    //         int j;
    //         for (j = i; j < n; j ++)
    //             if (S[j] == -S[i - 1])
    //                 break;
    //         while (j > i) {
    //             swap(S[j - 1], S[j]);
    //             j --;
    //             res ++;
    //         }
    //     }
    // }
    
    // for (int sz = 1; sz <= n / 2; sz ++) {
    //     res += sz - 1;
    // }

    int pos = 0;
    for (int i = 0; i < n; i ++) {
        if (S[i] > 0) continue;
        res += abs(i - pos);
        pos += 2;
    }
    return res;
}
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