oj.uz

Submission #911636

# Submission time Handle Problem Language Result Execution time Memory
911636 2024-01-19T04:23:16 Z The_Samurai Lamps (JOI19_lamps) C++17
4 / 100
 351 ms 14736 KB 
// I stand with PALESTINE




//#pragma GCC optimize("Ofast,O3")
//#pragma GCC target("avx,avx2")
#include "bits/stdc++.h"

using namespace std;
using ll = long long;

template<typename T> struct SegTree {
    vector<T> tree;
    int size;
    T neutral_element = 1e9; // sum - 0, mx - (-INF), mn - INF

    inline T merge(T a, T b) {
        return min(a, b);
    }

    void init(int n) {
        size = 1;
        while (size <= n) size *= 2;
        tree.assign(2 * size, neutral_element);
    }

    void build(vector<T> &a) {
        size = 1;
        while (size < a.size()) size *= 2;
        tree.assign(2 * size, neutral_element);
        for (int i = size; i < size + a.size(); i++) tree[i] = a[i - size];
        for (int i = size - 1; i > 0; i--) tree[i] = merge(tree[i << 1], tree[i << 1 | 1]);
    }

    void set(int p, T value) {  // set value at position p
        p += size;
        tree[p] = merge(value, tree[p]);
        for (; p > 1; p >>= 1) tree[p >> 1] = merge(tree[p], tree[p ^ 1]);
    }

    T get(int l, int r) {  // sum on interval [l, r]
        if (l > r) return neutral_element;
        T res = neutral_element;
        for (l += size, r += size + 1; l < r; l >>= 1, r >>= 1) {
            if (l & 1) res = merge(res, tree[l++]);
            if (r & 1) res = merge(res, tree[--r]);
        }
        return res;
    }
};


void solve() {
    int n;
    string s, t;
    cin >> n >> s >> t;
    s = "&" + s; t = "&" + t;
    auto find_ans = [&]() -> int {
        SegTree<int> sg; sg.init(n + 1);
        sg.set(0, 0);
        int l1 = 0, l2 = 0, eq = 0;
        for (int i = 1; i <= n; i++) {
            // teng emas
            if (s[i] != t[i]) l1++;
            else l1 = 0;
            if (l1) sg.set(i, sg.get(i - l1, i - l1) + 1);

            // hammasi teng
            if (s[i] == t[i]) eq++;
            else eq = 0;
            if (eq) sg.set(i, sg.get(i - eq, i - 1));

            // bir hil qib qo'yish
            if (t[i] == t[i - 1]) l2++;
            else l2 = 1;
            sg.set(i, sg.get(i - l2, i - l2) + 1);

//            cout << i << ' ' << sg.get(i, i) << endl;
        }
        return sg.get(n, n);
    };
    int ans = find_ans();
    for (int i = 1; i <= n; i++) s[i] ^= 1;
    ans = min(ans, find_ans() + 1);
    s = "&" + string(n, '0');
    ans = min(ans, find_ans() + 1);
    s = "&" + string(n, '1');
    ans = min(ans, find_ans() + 1);
    cout << ans;
}

int main() {
    cin.tie(0)->sync_with_stdio(false);
#ifdef sunnatov
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    int q = 1;
//    cin >> q;
    while (q--) {
        solve();
        cout << '\n';
    }
}

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Incorrect 0 ms 348 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #2
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Incorrect 0 ms 348 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #3
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 351 ms 14348 KB Output is correct
8 Correct 204 ms 14484 KB Output is correct
9 Correct 190 ms 14352 KB Output is correct
10 Correct 187 ms 14608 KB Output is correct
11 Correct 205 ms 14344 KB Output is correct
12 Correct 350 ms 14512 KB Output is correct
13 Correct 289 ms 14736 KB Output is correct
14 Correct 238 ms 14496 KB Output is correct

Subtask #4
0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Incorrect 0 ms 348 KB Output isn't correct
14 Halted 0 ms 0 KB -