oj.uz

Submission #885386

# Submission time Handle Problem Language Result Execution time Memory
885386 2023-12-09T14:58:29 Z Koyote Fortune Telling 2 (JOI14_fortune_telling2) C++11
100 / 100
 318 ms 66004 KB 
#include <bits/stdc++.h>
using namespace std;

#define TASK "flip"
 
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()

// Segment Tree (iterative)
template<class S, S (*op)(S, S), S (*e)()> struct segtree {
    int _n, _size, _log;
    vector<S> d;
    void updateS(int k) { d[k] = op(d[k << 1], d[k << 1 | 1]); }
    segtree(const vector<S> &v) : _n((int)v.size()) {
        _log = 31 - __builtin_clz(_n) + ((_n & -_n) != _n), _size = 1 << _log;
        d = vector<S>(_size << 1, e());
        for (int i = 0; i < _n; ++i) d[_size + i] = v[i];
        for (int i = _size - 1; i > 0; --i) updateS(i);
    }
    S query(int l, int r) { // [l, r)
        S sml = e(), smr = e();
        for (l += _size, r += _size; l < r; l >>= 1, r >>= 1) {
            if (l & 1) sml = op(sml, d[l++]);
            if (r & 1) smr = op(d[--r], smr);
        }
        return op(sml, smr);
    }
};

int max_op(int x, int y) { return max(x, y); }
int max_e() { return 0; }
// End of Segment Tree (iterative)

// Merge Sort Tree
template<class T> struct merge_sort_tree {
    int _l, _r, _m;
    vector<T> v;
    merge_sort_tree *lt, *rt;
    merge_sort_tree(int l, int r, const vector<T> &e) : _l(l), _r(r), _m((l + r) >> 1), v(r - l + 1) {
        if (l == r) v[0] = e[l], lt = rt = nullptr;
        else {
            lt = new merge_sort_tree(_l, _m, e);
            rt = new merge_sort_tree(_m + 1, _r, e);
            vector<T> v1 = lt->v, v2 = rt->v;
            merge(all(v1), all(v2), v.begin());
        }
    }
    int count(int qs, int qe, T x, T y) {
        if (x > y || _r < qs || qe < _l) return 0;
        if (qs <= _l && _r <= qe) return upper_bound(all(v), y) - lower_bound(all(v), x);
        return lt->count(qs, qe, x, y) + rt->count(qs, qe, x, y);
        // return (qs >= lt->_r ? lt->count(qs, qe, x, y) : 0) + (qe >= rt->_l ? rt->count(qs, qe, x, y) : 0);
    }
};
// End of Merge Sort Tree
 
const int N = 2e5 + 2;
int a[N], b[N], t[N], t_idx[N * 3];
 
int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    if (fopen(TASK ".inp", "r")) {
        freopen(TASK ".inp", "r", stdin);
        freopen(TASK ".out", "w", stdout);
    }
    int n, k; cin >> n >> k;
    for (int i = 1; i <= n; i++) cin >> a[i] >> b[i];
    for (int i = 1; i <= k; i++) cin >> t[i];

    // Compressing values
    basic_string<int> cmpr; cmpr.reserve(2 * n + k + 1), cmpr += 0;
    for (int i = 1; i <= n; i++) cmpr += a[i], cmpr += b[i];
    for (int i = 1; i <= k; i++) cmpr += t[i];
    sort(all(cmpr)), cmpr.erase(unique(all(cmpr)), cmpr.end());

    auto search = [&](const int v) -> int { return lower_bound(all(cmpr), v) - cmpr.begin(); };
    for (int i = 1; i <= n; i++) a[i] = search(a[i]), b[i] = search(b[i]);
    for (int i = 1; i <= k; i++) t[i] = search(t[i]), t_idx[t[i]] = i;

    // Data Structures
    segtree<int, max_op, max_e> stree(vector<int>(t_idx, t_idx + sz(cmpr) + 1));
    auto query_max_t_idx = [&](int l, int r) -> int { return stree.query(l, r + 1); };

    merge_sort_tree<int> mst(0, k + 1, vector<int>(t, t + k + 1));
    // Number of i that (l <= i <= r) and (x <= a[i] <= y)
    auto cnt_on_range = [&](int l, int r, int x, int y) -> int {
        return mst.count(l, r, x, y);
    };

    // Solving
    basic_string<int> ans; ans.reserve(n);
    for (int i = 1; i <= n; i++) {
        if (a[i] == b[i]) { ans += cmpr[a[i]]; continue; }

        // Assuming a[i] < b[i], find the last query that flips into b[i]
        bool swapped = (a[i] > b[i] ? (swap(a[i], b[i]), true) : false);
        int last_query = query_max_t_idx(a[i], b[i] - 1);

        // Count number of queries that guanrantee to flip
        int cnt_flipped = cnt_on_range(last_query + 1, k, b[i], sz(cmpr));
 
        if (last_query != 0 || swapped) swap(a[i], b[i]);
        ans += cmpr[~cnt_flipped & 1 ? a[i] : b[i]];
    }

    // for (int i : ans) cout << i << ' ';
    cout << accumulate(ans.begin(), ans.end(), 0LL) << '\n';
}

Compilation message

fortune_telling2.cpp: In function 'int main()':
fortune_telling2.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen(TASK ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
fortune_telling2.cpp:64:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         freopen(TASK ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 2 ms 2648 KB Output is correct
6 Correct 2 ms 2652 KB Output is correct
7 Correct 2 ms 2652 KB Output is correct
8 Correct 2 ms 2648 KB Output is correct
9 Correct 2 ms 2652 KB Output is correct
10 Correct 1 ms 2652 KB Output is correct
11 Correct 2 ms 2652 KB Output is correct
12 Correct 2 ms 2652 KB Output is correct
13 Correct 2 ms 2652 KB Output is correct

Subtask #2
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 2 ms 2648 KB Output is correct
6 Correct 2 ms 2652 KB Output is correct
7 Correct 2 ms 2652 KB Output is correct
8 Correct 2 ms 2648 KB Output is correct
9 Correct 2 ms 2652 KB Output is correct
10 Correct 1 ms 2652 KB Output is correct
11 Correct 2 ms 2652 KB Output is correct
12 Correct 2 ms 2652 KB Output is correct
13 Correct 2 ms 2652 KB Output is correct
14 Correct 12 ms 5208 KB Output is correct
15 Correct 24 ms 10096 KB Output is correct
16 Correct 39 ms 13308 KB Output is correct
17 Correct 50 ms 15828 KB Output is correct
18 Correct 50 ms 15740 KB Output is correct
19 Correct 50 ms 15828 KB Output is correct
20 Correct 51 ms 15716 KB Output is correct
21 Correct 49 ms 15704 KB Output is correct
22 Correct 40 ms 16152 KB Output is correct
23 Correct 39 ms 15216 KB Output is correct
24 Correct 39 ms 15256 KB Output is correct
25 Correct 38 ms 15744 KB Output is correct
26 Correct 49 ms 15664 KB Output is correct
27 Correct 72 ms 15904 KB Output is correct
28 Correct 51 ms 15760 KB Output is correct
29 Correct 112 ms 15688 KB Output is correct

Subtask #3
65.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 2 ms 2648 KB Output is correct
6 Correct 2 ms 2652 KB Output is correct
7 Correct 2 ms 2652 KB Output is correct
8 Correct 2 ms 2648 KB Output is correct
9 Correct 2 ms 2652 KB Output is correct
10 Correct 1 ms 2652 KB Output is correct
11 Correct 2 ms 2652 KB Output is correct
12 Correct 2 ms 2652 KB Output is correct
13 Correct 2 ms 2652 KB Output is correct
14 Correct 12 ms 5208 KB Output is correct
15 Correct 24 ms 10096 KB Output is correct
16 Correct 39 ms 13308 KB Output is correct
17 Correct 50 ms 15828 KB Output is correct
18 Correct 50 ms 15740 KB Output is correct
19 Correct 50 ms 15828 KB Output is correct
20 Correct 51 ms 15716 KB Output is correct
21 Correct 49 ms 15704 KB Output is correct
22 Correct 40 ms 16152 KB Output is correct
23 Correct 39 ms 15216 KB Output is correct
24 Correct 39 ms 15256 KB Output is correct
25 Correct 38 ms 15744 KB Output is correct
26 Correct 49 ms 15664 KB Output is correct
27 Correct 72 ms 15904 KB Output is correct
28 Correct 51 ms 15760 KB Output is correct
29 Correct 112 ms 15688 KB Output is correct
30 Correct 119 ms 57992 KB Output is correct
31 Correct 171 ms 60364 KB Output is correct
32 Correct 192 ms 60576 KB Output is correct
33 Correct 296 ms 65972 KB Output is correct
34 Correct 109 ms 57716 KB Output is correct
35 Correct 294 ms 65952 KB Output is correct
36 Correct 282 ms 65956 KB Output is correct
37 Correct 286 ms 65836 KB Output is correct
38 Correct 277 ms 65836 KB Output is correct
39 Correct 301 ms 66004 KB Output is correct
40 Correct 276 ms 65892 KB Output is correct
41 Correct 285 ms 65908 KB Output is correct
42 Correct 291 ms 65836 KB Output is correct
43 Correct 206 ms 65836 KB Output is correct
44 Correct 206 ms 65912 KB Output is correct
45 Correct 210 ms 65992 KB Output is correct
46 Correct 216 ms 61892 KB Output is correct
47 Correct 236 ms 59716 KB Output is correct
48 Correct 318 ms 62008 KB Output is correct
49 Correct 311 ms 61772 KB Output is correct