Submission #953271

#	Time	Username	Problem	Language	Result	Execution time	Memory
953271		AlphaMale06	Global Warming (CEOI18_glo)	C++17	0 / 100	64 ms	11100 KiB

glo

#include <bits/stdc++.h>

using namespace std;

#define pb push_back

const int N = 2e5+3;
vector<int> dp[N];
int ndp[N];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, d;
    cin >> n >> d;
    int a[n];
    for(int i=0; i< n; i++)cin >> a[i];
    dp[0].pb(2e9+1);
    int mx=0;
    for(int i = n-1; i>=0; i--){
        if(a[i]<dp[mx].back()){
            mx++;
            dp[mx].pb(a[i]);
            continue;
        }
        int l = 1, r = mx;
        while(l<=r){
            int s = l+r>>1;
            if(dp[s].back()>=a[i])l=s+1;
            else r=s-1;
        }
        if(dp[l].back()<=a[i])dp[l].pb(a[i]);
    }
    int ans=mx;
    for(int i = 1; i<=n; i++)ndp[i]=1e9+i;
    ndp[0]=-1e9;
    int mxx=0;
    for(int i=0; i < n; i++){
        if(a[i]==dp[mx].back()){
            dp[mx].pop_back();
            if(!dp[mx].size())mx--;
        }
        else{
            int l = 1, r = mx;
            while(l<=r){
                int s = l+r>>1;
                if(dp[s].back()>=a[i])l=s+1;
                else r=s-1;
            }
            if(dp[r].back()==a[i])dp[r].pop_back();
        }
        int l = 0, r = n;
        if(a[i]-d>ndp[mxx]){
            mxx++;
            ndp[mxx]=a[i]-d;
        }
        else{
            while(l<=r){
                int s = l+r>>1;
                if(ndp[s]>a[i]-d)r=s-1;
                else l=s+1;
            }
            ndp[l]=min(ndp[l], a[i]-d);
        }
        l=0, r=mx;
        while(l<=r){
            int s = l+r>>1;
            if(dp[s].back()>ndp[mxx]){
                ans=max(ans, mxx+s);
                l=s+1;
            }
            else{
                r=s-1;
            }
        }
    }
    cout << ans << '\n';
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:29:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   29 |             int s = l+r>>1;
      |                     ~^~
glo.cpp:47:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   47 |                 int s = l+r>>1;
      |                         ~^~
glo.cpp:60:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   60 |                 int s = l+r>>1;
      |                         ~^~
glo.cpp:68:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   68 |             int s = l+r>>1;
      |                     ~^~

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