Submission #854078

#	Time	Username	Problem	Language	Result	Execution time	Memory
854078		The_Samurai	Money (IZhO17_money)	C++17	45 / 100	1545 ms	7000 KiB

money

#include "bits/stdc++.h"
using namespace std;
using ll = long long;
const int inf = 1e9;
const int N = 1e6 + 5;

struct SegTree {
    vector<int> tree;
    int size;

    void init(int n) {
        size = 1;
        while (size < n) size <<= 1;
        tree.assign(2 * size, 0);
    }

    void update(int i, int v, int x, int l, int r) {
        if (r - l == 1) {
            tree[x] += v;
            return;
        }
        int m = (l + r) >> 1;
        if (i < m) update(i, v, x << 1, l, m);
        else update(i, v, x << 1 | 1, m, r);
        tree[x] = tree[x << 1] + tree[x << 1 | 1];
    }

    void update(int i, int v) {
        assert(i < size);
        update(i, v, 1, 0, size);
    }

    int find_bigger(int k, int x, int l, int r) {
        if (r - l == 1) return l;
        int m = (l + r) >> 1;
        if (tree[x << 1] >= k) return find_bigger(k, x << 1, l, m);
        else return find_bigger(k - tree[x << 1], x << 1 | 1, m, r);
    }

    int find_bigger(int k) {
        return find_bigger(k, 1, 0, size);
    }
};

vector<int> add(vector<int> a, vector<int> b) {
    if (a.empty()) return b;
    if (b.back() <= a[0]) {
        for (int x: a) b.emplace_back(x);
        return b;
    }
    if (a.back() <= b[0]) {
        for (int x: b) a.emplace_back(x);
        return a;
    }
    for (int i = 1; i < a.size(); i++) {
        if (a[i - 1] <= b[0] and b.back() <= a[i]) {
            vector<int> v;
            for (int j = 0; j < i; j++) v.emplace_back(a[j]);
            for (int x: b) v.emplace_back(x);
            for (int j = i; j < a.size(); j++) v.emplace_back(a[j]);
            return v;
        }
    }
    return {};
}

int main() {
    cin.tie(0)->sync_with_stdio(false);
#ifdef sunnatov
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif

    int n;
    cin >> n;
    vector<int> a(n + 1);
    for (int i = 1; i <= n; i++) cin >> a[i];
//    SegTree sg; sg.init(N);
    vector<int> ans, now = {a[1]};
    int cnt = 1;
    for (int i = 2; i <= n; i++) {
        if (a[i] < now.back()) {
            ans = add(ans, now);
            cnt++;
            now = {a[i]};
            continue;
        }
        now.emplace_back(a[i]);
        auto v = add(ans, now);
        if (v.empty()) {
            now.pop_back();
            ans = add(ans, now);
            now = {a[i]};
            cnt++;
        }
    }
    cout << cnt;
}

Compilation message (stderr)

money.cpp: In function 'std::vector<int> add(std::vector<int>, std::vector<int>)':
money.cpp:55:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |     for (int i = 1; i < a.size(); i++) {
      |                     ~~^~~~~~~~~~
money.cpp:60:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |             for (int j = i; j < a.size(); j++) v.emplace_back(a[j]);
      |                             ~~^~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 0 / 55