Submission #1278883

#	Time	Username	Problem	Language	Result	Execution time	Memory
1278883		wedonttalkanymore	Growing Trees (BOI11_grow)	C++20	10 / 100	112 ms	20292 KiB

grow

#include <bits/stdc++.h>
/*
    Wake up, I'm wake up
    Thu sang roi, em thay khong?
*/
using namespace std;
using ll = long long;

#define int long long
#define pii pair<ll, ll>
#define fi first
#define se second

const ll N = 2e5 + 5, inf = 1e18, mod = 1e9 + 7, block = 320, lim = 19;

int n, m;
int a[N];

struct ST {
    vector <int> st, lz, st1;
    ST (int _n) {
        st.assign(4 * (_n + 1), 0);
        lz.assign(4 * (_n + 1), 0);
        st1.assign(4 * (_n + 1), inf);
    }
    void lazy(int i, int l, int r) {
        if (lz[i]) {
            if (l < r) {
                st[2 * i] += lz[i];
                st[2 * i + 1] += lz[i];
                st1[2 * i] += lz[i];
                st1[2 * i + 1] += lz[i];
                lz[2 * i] += lz[i];
                lz[2 * i + 1] += lz[i];
            }
            lz[i] = 0;
        }
    }
    void build(int i, int l, int r) {
        if (l == r) {
            st[i] = a[l];
            st1[i] = a[l];
            return;
        }
        int mid = (l + r) / 2;
        build(2 * i, l, mid);
        build(2 * i + 1, mid + 1, r);
        st[i] = max(st[2 * i], st[2 * i + 1]);
        st1[i] = min(st1[2 * i], st1[2 * i + 1]);
    }
    void update(int i, int l, int r, int u, int v, int val) {
        if (u > r || v < l) return;
        if (u <= l && r <= v) {
            lz[i] += val;
            st[i] += val;
            st1[i] += val;
            return;
        }
        int mid = (l + r) / 2;
        lazy(i, l, r);
        update(2 * i, l, mid, u, v, val);
        update(2 * i + 1, mid + 1, r, u, v, val);
        st[i] = max(st[2 * i], st[2 * i + 1]);
        st1[i] = min(st1[2 * i], st1[2 * i + 1]);
    }
    int get(int i, int l, int r, int u, int v) {
        lazy(i, l, r);
        if (u > r || v < l) return 0;
        if (u <= l && r <= v) return st[i];
        int mid = (l + r) / 2;
        return max(get(2 * i, l, mid, u, v), get(2 * i + 1, mid + 1, r, u, v));
    }
    int findL(int i, int l, int r, int val) { // vi tri nho nhat >= val
        // cout << "now: " << i << ' ' << l << ' ' << r << ' ' << val << ' ' << st[2 * i] << ' ' << st[2 * i + 1] << '\n';
        lazy(i, l, r);
        if (st[i] < val) return -1;
        if (l == r) return l;
        int mid = (l + r) / 2;
        int ans = -1;
        if (st[2 * i] >= val) ans = findL(2 * i, l, mid, val);
        if (ans == -1) ans = findL(2 * i + 1, mid + 1, r, val);
        return ans;
    }
    int findR(int i, int l, int r, int val) { // vi tri lon nhat < val
        // cout << "now: " << i << ' ' << l << ' ' << r << ' ' << val << ' ' << st[2 * i] << ' ' << st[2 * i + 1] << '\n';
        lazy(i, l, r);
        if (st1[i] >= val) return -1;
        if (l == r) return l;
        int mid = (l + r) / 2;
        int ans = -1;
        if (st1[2 * i + 1] < val) ans = findR(2 * i + 1, mid + 1, r, val);
        if (ans == -1)  ans = findR(2 * i, l, mid, val);
        return ans;
    }
} st(N);

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    if (fopen(".inp", "r")) {
        freopen(".inp", "r", stdin);
        freopen(".out", "w", stdout);
    }
    cin >> n >> m;
    for (int i = 1; i <= n; i++) cin >> a[i];
    sort(a + 1, a + n + 1);
    st.build(1, 1, n);
    for (int i = 1; i <= m; i++) {
        char type;
        int x, y;
        cin >> type >> x >> y;
        if (type == 'F') {
            int L = st.findL(1, 1, n, y);
            if (L == -1) continue;
            int R = min(L + x - 1, n);
            int have = min(x, R - L + 1);
            // cout << "at: " << R - L + 1 << ' ' << a << '\n';
            // cout << L << ' ' << R << ' ' << have << '\n';
            int value = st.get(1, 1, n, R, R);
            // cout << "value: " << value << '\n';
            int belowR = st.findR(1, 1, n, value);
            // cout << "belowR: " << belowR << '\n';
            int remain = have - (belowR - L + 1);
            int last = st.findL(1, 1, n, value + 1);
            // cout << "last: " << last << '\n';
            if (last == -1) last = R + 1;
            last--;
            // cout << "remain: " << remain << '\n';
            st.update(1, 1, n, L, belowR, 1);
            st.update(1, 1, n, last - remain + 1, last, 1);
            // for (int i = 1; i <= n; i++) {
            //     int x = st.get(1, 1, n, i, i);
            //     cout << x << ' ';
            // }
            // cout << '\n';
        }
        else if (type == 'C') {
            int L = st.findL(1, 1, n, x);
            int R = st.findR(1, 1, n, y + 1);
            if (L == -1) L = n + 1;
            if (R == -1) R = n;
            // cout << L << ' ' << R << '\n';
            cout << R - L + 1 << '\n';
        }
    }
    return 0;
}

Compilation message (stderr)

grow.cpp: In function 'int main()':
grow.cpp:101:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  101 |         freopen(".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
grow.cpp:102:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  102 |         freopen(".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
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• Subtask 10: 10 / 10