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Submission #661144

# Submission time Handle Problem Language Result Execution time Memory
661144 2022-11-24T16:48:38 Z amsraman Arranging Shoes (IOI19_shoes) C++17
45 / 100
 43 ms 10544 KB 
#include <bits/stdc++.h>
typedef long long ll;

using namespace std;

template <typename T>
struct FenwickTree {
    size_t n;
    vector<T> bit;
    FenwickTree(size_t n): n(n), bit(n, 0) {};
    FenwickTree(vector<T> & init): n((int) init.size()), bit((int) init.size()) {
        copy(init.begin(), init.end(), bit.begin());
        for(int i = 1; i <= n; i++) {
            if(i + (i & -i) <= n) {
                bit[i + (i & -i) - 1] += bit[i - 1];
            }
        }
    }
    T qry(int k) {
        T ret = 0;
        for(k++; k > 0; k -= k & -k) {
            ret += bit[k - 1];
        }
        return ret;
    }
    T qry(int l, int r) {
        return qry(r) - qry(l - 1);
    }
    void upd(int k, T x) {
        for(k++; k <= n; k += k & -k) {
            bit[k - 1] += x;
        }
    }
};

ll count_swaps(vector<int> S) {
    int n = S.size();
    ll ans = 0;
    FenwickTree<ll> ft(n);
    vector<int> lefts;
    vector<vector<int>> rights(n / 2);
    for(int i = 0; i < n; i++) {
        ft.upd(i, 1);
        if(S[i] < 0) {
            lefts.push_back(i);
        } else {
            rights[S[i] - 1].push_back(i);
        }
    }
    for(int i = 0; i < n / 2; i++) {
        reverse(rights[i].begin(), rights[i].end());
    }
    for(int i = 0; i < n / 2; i++) {
        ft.upd(lefts[i], -1); ans += ft.qry(lefts[i]);
        int pos = -S[lefts[i]] - 1, right_back = rights[pos].back(); rights[pos].pop_back();
        ft.upd(right_back, -1); ans += ft.qry(right_back);
    }
    return ans;
}

Compilation message

shoes.cpp: In instantiation of 'void FenwickTree<T>::upd(int, T) [with T = long long int]':
shoes.cpp:43:20:   required from here
shoes.cpp:30:20: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   30 |         for(k++; k <= n; k += k & -k) {
      |                  ~~^~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 304 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 296 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Incorrect 1 ms 300 KB Output isn't correct
15 Halted 0 ms 0 KB -

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 296 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 1 ms 304 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 4 ms 1108 KB Output is correct
21 Correct 3 ms 1108 KB Output is correct
22 Correct 34 ms 7892 KB Output is correct
23 Correct 31 ms 7976 KB Output is correct
24 Correct 34 ms 7980 KB Output is correct
25 Correct 28 ms 7976 KB Output is correct
26 Correct 32 ms 7968 KB Output is correct
27 Correct 30 ms 7860 KB Output is correct
28 Correct 30 ms 8112 KB Output is correct
29 Correct 31 ms 8100 KB Output is correct
30 Correct 32 ms 8132 KB Output is correct
31 Correct 34 ms 7876 KB Output is correct
32 Correct 29 ms 8096 KB Output is correct
33 Correct 31 ms 7972 KB Output is correct
34 Correct 34 ms 8132 KB Output is correct
35 Correct 1 ms 212 KB Output is correct
36 Correct 1 ms 212 KB Output is correct
37 Correct 31 ms 8112 KB Output is correct
38 Correct 35 ms 8096 KB Output is correct
39 Correct 31 ms 8096 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 43 ms 10544 KB Output is correct
6 Correct 43 ms 8100 KB Output is correct
7 Correct 41 ms 10436 KB Output is correct
8 Correct 33 ms 8104 KB Output is correct
9 Correct 40 ms 10520 KB Output is correct
10 Correct 43 ms 8980 KB Output is correct

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 304 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 296 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Incorrect 1 ms 300 KB Output isn't correct
15 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 304 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 296 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Incorrect 1 ms 300 KB Output isn't correct
15 Halted 0 ms 0 KB -