Submission #1000084

#	Time	Username	Problem	Language	Result	Execution time	Memory
1000084		daffuwu	Global Warming (CEOI18_glo)	C++14	100 / 100	46 ms	3712 KiB

glo

#include <bits/stdc++.h>
using namespace std;
#define fr first
#define sc second
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

int n, x, t[200069], ans, r[200069];
vector<int> vc;

int main() 
{
    int i, j;
    scanf("%d%d", &n, &x);
    for (i=1; i<=n; i++)
    {
        scanf("%d", t+i);
    }
    for (i=n; i>=1; i--)
    {
        auto it = lower_bound(vc.begin(), vc.end(), -t[i]);
        if (it == vc.end()) 
        {
            vc.push_back(-t[i]);
            r[i] = vc.size();
        }  else 
        {
            *it = -t[i];
            r[i] = it-vc.begin()+1;
        }
    }
    vc.clear();
    for (i=1; i<=n; i++)
    {
        auto it = lower_bound(vc.begin(), vc.end(), t[i]);
        if (it == vc.end()) vc.push_back(t[i]);
        else *it = t[i];
        j = upper_bound(vc.begin(), vc.end(), t[i+1]+x-1)-vc.begin();
        ans = max(ans, j+r[i+1]);
    }
    printf("%d\n", ans);
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     scanf("%d%d", &n, &x);
      |     ~~~~~^~~~~~~~~~~~~~~~
glo.cpp:16:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |         scanf("%d", t+i);
      |         ~~~~~^~~~~~~~~~~

• 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