Submission #413564

#	Time	Username	Problem	Language	Result	Execution time	Memory
413564		nkato	Global Warming (CEOI18_glo)	C++17	100 / 100	66 ms	5328 KiB

glo

#include <bits/stdc++.h>

using namespace std;

const int nax = 2e5+10;
int pfx[nax];

void smx(int& a, int b) { a = max(a, b); }

int main() {


	// freopen(".in", "r", stdin);
	// freopen(".out", "w", stdout);

    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n, x; cin >> n >> x;
    vector<int> t(n);
    for(int i = 0; i < n; i++) cin >> t[i];

    int mx = 0;
	vector<int> dp(n, INT_MAX);
	for(int i = 0; i < n; i++) {
		int j = (int) (lower_bound(begin(dp), end(dp), t[i])-begin(dp));
		dp[j] = t[i];
		pfx[i] = j+1;
		smx(mx, pfx[i]);
	}

	dp = vector<int>(n, INT_MAX);

	for(int i = n-1; i >= 0; i--) {
		int pos = (int) (lower_bound(begin(dp), end(dp), -t[i]+x)-begin(dp));
		smx(mx, pfx[i]+pos);
		int j = (int) (lower_bound(begin(dp), end(dp), -t[i])-begin(dp));
		dp[j] = -t[i];
	}

	cout << mx << endl;
    
    return 0;
}

• 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