Submission #971880

#	Time	Username	Problem	Language	Result	Execution time	Memory
971880		jadai007	Global Warming (CEOI18_glo)	C++17	10 / 100	2065 ms	3420 KiB

glo

#include<bits/stdc++.h>
#define int long long

using namespace std;

int n,x, arr[200200], p, dp[200200], ans;

signed main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> x;
    for(int i = 0; i<n; ++i) cin >> arr[i];
    if(x == 0){
        for(int i = 0; i<n; ++i){
            int idx = lower_bound(dp, dp+p, arr[i]) - dp;
            if(idx == p) ++p;
            dp[idx] = arr[i];
        }
        cout << p;
        return 0;
    }
    for(int d = -x; d<=x; ++d){
        for(int i = 0; i<n; ++i){
            for(int j = i+1; j<n; ++j){
                int a = arr[i];
                int b = arr[j];
                arr[i]+=d; arr[j]+=d;
                memset(dp, 0, sizeof(dp)); p = 0;
                for(int k = 0; k<n; ++k){
                    int idx = lower_bound(dp, dp+p, arr[k]) - dp;
                    if(idx == p) p++;
                    dp[idx] = arr[k];
                }
                ans = max(ans, p);
                arr[i] = a, arr[j] = b;
            }
        }
    }
    cout << ans;
}

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