Submission #1135552

#	Time	Username	Problem	Language	Result	Execution time	Memory
1135552		kfhjad	Wall (IOI14_wall)	C++20	100 / 100	661 ms	78652 KiB

wall

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

struct LazySegTree
{
    int N;
    vector<int> add, rem;
    
    LazySegTree(int n) : N(n), add(4 * n), rem(4 * n, 2E9) {}
    
    void apply(int u, int h, bool flag) // flag = true if adding
    {
        if (flag)
            add[u] = max(add[u], h), rem[u] = max(rem[u], add[u]);
        else
            rem[u] = min(rem[u], h), add[u] = min(add[u], rem[u]);
    }
    
    void propagate(int u)
    {
        apply(u * 2, add[u], true);
        apply(u * 2, rem[u], false);
        apply(u * 2 + 1, add[u], true);
        apply(u * 2 + 1, rem[u], false);
        rem[u] = 2E9;
        add[u] = 0;
    }
    
    void update(int l, int r, int h, bool flag) { update(1, N, l, r, 1, h, flag); }
    
    void update(int l, int r, int L, int R, int u, int h, bool flag)
    {
        if (R < l || r < L)
            return;
        
        if (L <= l && r <= R)
            apply(u, h, flag);
        else
        {
            int m = (l + r) / 2;
            propagate(u);
            update(l, m, L, R, u * 2, h, flag);
            update(m + 1, r, L, R, u * 2 + 1, h, flag);
        }
    }
    
    int query(int at) { return query(at, 1, N, 1); }
    
    int query(int at, int l, int r, int u)
    {
        if (l == r)
            return add[u];
        
        int m = (l + r) / 2;
        propagate(u);
        
        if (at <= m)
            return query(at, l, m, u * 2);
        else
            return query(at, m + 1, r, u * 2 + 1);
    }
};

void buildWall(int n, int k, int op[], int left[], int right[], int height[], int finalHeight[])
{
    LazySegTree seg(n);
    
    for (int i = 0; i < k; ++i)
        seg.update(left[i] + 1, right[i] + 1, height[i], op[i] == 1);
    
    for (int i = 0; i < n; ++i)
        finalHeight[i] = seg.query(i + 1);
}
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• Subtask 1: 8 / 8
• Subtask 2: 24 / 24
• Subtask 3: 29 / 29
• Subtask 4: 39 / 39