Submission #1125780

#	Time	Username	Problem	Language	Result	Execution time	Memory
1125780		vladilius	Global Warming (CEOI18_glo)	C++20	0 / 100	2094 ms	6404 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 FT{
    vector<int> bit;
    int n;
    FT(int ns){
        n = ns;
        bit.resize(n + 1);
    }
    void upd(int v, int x){
        while (v <= n){
            bit[v] = max(bit[v], x);
            v |= (v + 1);
        }
    }
    int get(int v){
        int out = 0;
        while (v > 0){
            out = max(out, bit[v]);
            v = (v & (v + 1)) - 1;
        }
        return out;
    }
};

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){
        vector<pii> all;
        for (int i = 1; i <= n; i++){
            all.pb({x[i], i});
        }
        sort(all.begin(), all.end());
        vector<int> vv;
        int i = 0, cc = 1;
        while (i < n){
            int j = i;
            while (j < n && all[i] == all[j]){
                x[all[j].ss] = cc;
                j++;
            }
            
            vv.pb(all[i].ff);
            
            i = j; cc++;
        }
        
        
        vector<int> :: iterator it;
        
        FT T(n);
        vector<int> dp(n + 1);
        int ret = 0;
        for (int i = 1; i <= n; i++){
            it = lower_bound(vv.begin(), vv.end(), x[i]);
            int j = (int) (it - vv.begin());
            
            dp[i] = 1 + T.get(j);
            ret = max(ret, dp[i]);
            T.upd(j + 1, dp[i]);
        }
        
        return ret;
    };
    
    int out = lis(a);
    
    for (int i = 1; i <= n; i++){
        a[i] -= x;
        out = max(out, lis(a));
    }
    
    for (int i = 1; i <= n; i++) a[i] += x;
    
    for (int i = n; i > 0; i--){
        a[i] += x;
        out = max(out, lis(a));
    }
    
    cout<<out<<"\n";
}

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