Submission #1125797

#	Time	Username	Problem	Language	Result	Execution time	Memory
1125797		vladilius	Global Warming (CEOI18_glo)	C++20	15 / 100	2095 ms	5700 KiB

glo

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define pb push_back
#define ff first
#define ss second

struct ST{
    vector<int> t;
    int n;
    ST(int ns){
        n = ns;
        t.resize(4 * n);
    }
    void upd(int v, int tl, int tr, int& p, int& x){
        if (tl == tr){
            t[v] = max(t[v], x);
            return;
        }
        int tm = (tl + tr) / 2, vv = 2 * v;
        if (p <= tm){
            upd(vv, tl, tm, p, x);
        }
        else {
            upd(vv + 1, tm + 1, tr, p, x);
        }
        t[v] = max(t[vv], t[vv + 1]);
    }
    void upd(int p, int x){
        upd(1, 1, n, p, x);
    }
    int get(int v, int tl, int tr, int& p){
        if (tl > p) return 0;
        if (tr <= p){
            return t[v];
        }
        int tm = (tl + tr) / 2, vv = 2 * v;
        return max(get(vv, tl, tm, vv), get(vv + 1, tm + 1, tr, p));
    }
    int get(int p){
        if (!p) return 0;
        return get(1, 1, n, p);
    }
};

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int n, x; cin>>n>>x;
    vector<int> a(n + 1);
    for (int i = 1; i <= n; i++){
        cin>>a[i];
    }
    
    auto lis = [&](vector<int> x){
        ST T(n);
        vector<int> dp(n + 1);
        int ret = 0;
        for (int i = 1; i <= n; i++){
            dp[i] = 1;
            for (int j = 1; j < i; j++){
                if (x[j] < x[i]){
                    dp[i] = max(dp[i], dp[j] + 1);
                }
            }
            ret = max(ret, dp[i]);
        }
        
        return ret;
    };
    
    int out = 0;
    
    for (int l = 1; l <= n; l++){
        for (int r = l; r <= n; r++){
            for (int d = -x; d <= x; d++){
                for (int i = l; i <= r; i++){
                    a[i] += d;
                }
                out = max(out, lis(a));
                for (int i = l; i <= r; i++){
                    a[i] -= d;
                }
            }
        }
    }
    
    cout<<out<<"\n";
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 13
• Subtask 4: 0 / 10
• Subtask 5: 0 / 20
• Subtask 6: 0 / 17
• Subtask 7: 0 / 25