Submission #785358

#	Time	Username	Problem	Language	Result	Execution time	Memory
785358		devariaota	Global Warming (CEOI18_glo)	C++17	25 / 100	2054 ms	262144 KiB

glo

#include<bits/stdc++.h>
using namespace std;
#define ioss ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define int long long
#define pii pair<int, int>
#define fi first
#define se second
#define pb push_back
int n, x;
int arr[200004], dp[200004];
signed main() {
    ioss;
    cin >> n >> x;
    for(int i = 0; i < n; i++) cin >> arr[i];
    if(x == 0) {
        vector<int> tmp;
        for(int i = 0; i < n; i++) {
            if(i == 0) {
                dp[i] = 1;
                tmp.pb(arr[i]);
                continue;
            }
            if(arr[i] > tmp.back()) dp[i] = dp[i-1]+1, tmp.pb(arr[i]);
            else {
                int cur = lower_bound(tmp.begin(), tmp.end(), arr[i])-tmp.begin();
                tmp[cur] = arr[i];
                dp[i] = dp[i-1];
                // for(auto x : tmp) cout << x << " ";
                // cout << endl;
            }
            // cout << " :: " << arr[i] << " " << tmp.back() << " " << dp[i] << endl;
        }
        cout << dp[n-1] << endl;
        return 0;
    }

    vector<pii> range;
    for(int j = 0; j < n; j++) {
        for(int k = j; k < n; k++) {
            range.pb({j, k});
        }
    }

    int ans = 0;
    for(auto [l, r] : range) {
        // cout << l << " " << r << endl;
        for(int k = -x; k <= x; k++) {
            vector<int> tmp;
            for(int i = 0; i < n; i++) dp[i] = 0;
            for(int i = 0; i < n; i++) {
                if(i == 0) {
                    dp[i] = 1;
                    tmp.pb(arr[i]);
                    continue;
                }
                if(i >= l && i <= r) arr[i] += k;
                if(arr[i] > tmp.back()) dp[i] = dp[i-1]+1, tmp.pb(arr[i]);
                else {
                    int cur = lower_bound(tmp.begin(), tmp.end(), arr[i])-tmp.begin();
                    tmp[cur] = arr[i];
                    dp[i] = dp[i-1];
                    // for(auto x : tmp) cout << x << " ";
                    // cout << endl;
                }
                // cout << " :: " << arr[i] << " " << tmp.back() << " " << dp[i] << endl;
                if(i >= l && i <= r) arr[i] -= k;
                ans = max(ans, dp[n-1]);
            }
        }
    }
    cout << ans << endl;
}

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