Submission #1103266

#	Time	Username	Problem	Language	Result	Execution time	Memory
1103266		coolboy19521	Global Warming (CEOI18_glo)	C++17	100 / 100	79 ms	5456 KiB

glo

#include "bits/stdc++.h"

using namespace std;

const int inf = 1e9 + 7;

int main() {
    int n, x;
    cin >> n >> x;

    vector<int> t(n + 1);

    for (int i = 1; i <= n; i ++) {
        cin >> t[i];
    }

    vector<int> v(n, inf);
    vector<int> dp(n + 1);
    int r = 0;

    for (int i = 1; i <= n; i ++) {
        int j = lower_bound(begin(v),end(v),t[i]) - begin(v);
        v[j] = t[i];
        dp[i] = j + 1;
        r = max(r, dp[i]);
    }

    v = vector<int>(n, inf);

    for (int i = n; 0 < i; i --) {
        int j = lower_bound(begin(v),end(v),-t[i] + x) - begin(v);
        r = max(r, dp[i] + j);

        j = lower_bound(begin(v),end(v),-t[i]) - begin(v);
        v[j] = -t[i];
    }

    cout << r << '\n';
}

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