Submission #824744

#	Time	Username	Problem	Language	Result	Execution time	Memory
824744		Koyote	Fortune Telling 2 (JOI14_fortune_telling2)	C++14	100 / 100	375 ms	115332 KiB

fortune_telling2

#include <bits/stdc++.h>
using namespace std;

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

template<class T> struct merge_sort_tree {
    int _l, _r, _m;
    vector<T> v;
    merge_sort_tree *left, *right;
    merge_sort_tree(int l, int r, vector<T> &e) {
        v.resize(r - l + 1);
        _l = l, _r = r, _m = (l + r) >> 1, v[0] = e[l];
        if (l == r) left = right = nullptr;
        else {
            left = new merge_sort_tree(_l, _m, e);
            right = new merge_sort_tree(_m + 1, _r, e);
            vector<T> v1 = left->v, v2 = right->v;
            v.clear();
            int s1 = sz(v1), s2 = sz(v2);
            v.reserve(s1 + s2);
            int i = 0, j = 0;
            while (i < s1 && j < s2) {
                if (v1[i] <= v2[j]) v.push_back(v1[i]), i++;
                else v.push_back(v2[j]), j++;
            }
            while (i < s1) v.push_back(v1[i]), i++;
            while (j < s2) v.push_back(v2[j]), j++;
        }
    }
    int count(int l, int r, T a, T b) {
        if (a > b) return 0;
        if (l > _r || r < _l) return 0;
        if (_l >= l && _r <= r) return upper_bound(all(v), b) - lower_bound(all(v), a);
        return left->count(l, r, a, b) + right->count(l, r, a, b);
    }
};

const int N = 2e5 + 7, N2 = 6e5 + 2, LG = 22;
int n, k, a[N], b[N], t[N], ti[N2];
int spt_max_ti[N2][LG];

int lg2(int x) { return x ? 31 - __builtin_clz(x) : -1; }

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> k;
    for (int i = 0; i < n; i++) cin >> a[i] >> b[i];
    for (int i = 0; i < k; i++) cin >> t[i];

    vector<int> compr; compr.reserve(2 * n + k);
    for (int i = 0; i < n; i++) compr.push_back(a[i]), compr.push_back(b[i]);
    for (int i = 0; i < k; i++) compr.push_back(t[i]);
    sort(compr.begin(), compr.end());
    compr.erase(unique(compr.begin(), compr.end()), compr.end());
    for (int i = 0; i < n; i++) {
        a[i] = lower_bound(compr.begin(), compr.end(), a[i]) - compr.begin();
        b[i] = lower_bound(compr.begin(), compr.end(), b[i]) - compr.begin();
    }
    for (int i = 0; i < k; i++)
        t[i] = lower_bound(compr.begin(), compr.end(), t[i]) - compr.begin();

    int max_ti = compr.size();
    for (int i = 0; i <= max_ti; i++) ti[i] = -1;
    for (int i = 0; i < k; i++) ti[t[i]] = i;
    for (int i = 0; i <= max_ti; i++)
        spt_max_ti[i][0] = ti[i];
    for (int j = 1; j < LG; j++)
        for (int i = 0; i + (1 << j) - 1 <= max_ti; i++)
            spt_max_ti[i][j] = max(spt_max_ti[i][j - 1], spt_max_ti[i + (1 << (j - 1))][j - 1]);
    
    auto query_max_ti = [&](int l, int r) {
        int len = lg2(r - l + 1);
        return max(spt_max_ti[l][len], spt_max_ti[r - (1 << len) + 1][len]);
    };

    vector<int> t_vector(k);
    for (int i = 0; i < k; i++) t_vector[i] = t[i];
    auto cnt_in_range_ab = merge_sort_tree<int>(0, k - 1, t_vector);

    long long ans = 0;
    for (int i = 0; i < n; i++) {
        if (a[i] == b[i]) { ans += compr[a[i]]; continue; }
        bool swapped = (a[i] > b[i]);
        if (a[i] > b[i]) swap(a[i], b[i]);
        auto last_pos = query_max_ti(a[i], b[i] - 1);
        int cnt_flipped = cnt_in_range_ab.count(last_pos + 1, k - 1, b[i], int(1e9));

        if (last_pos != -1 || swapped) swap(a[i], b[i]);
        if (cnt_flipped % 2 == 0) ans += compr[a[i]];
        else ans += compr[b[i]];
    }
    cout << ans << '\n';
}

• Subtask 1: 4 / 4
• Subtask 2: 31 / 31
• Subtask 3: 65 / 65