Submission #953942

#	Time	Username	Problem	Language	Result	Execution time	Memory
953942		AlphaMale06	Global Warming (CEOI18_glo)	C++17	0 / 100	19 ms	6236 KiB

glo

#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define int long long
#define F first
#define S second

const int N = 2e5+3;
int dp[N], ndp[N];
pair<int, int> mdp[N];

signed 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] = 2e9+1;
    int mx=0;
    for(int i = n-1; i>=0; i--){
        if(a[i]<dp[mx]){
            mx++;
            dp[mx]=a[i];
            continue;
        }
        int l = 1, r = mx;
        while(l<=r){
            int s = l+r>>1;
            if(dp[s]>a[i])l=s+1;
            else r=s-1;
        }
        dp[r]=max(dp[r], a[i]);
        mdp[i] = {mx, dp[mx]};
    }
    int ans=mx;
    if(d==0){
        cout << ans;
        return 0;
    }
    for(int i = 1; i<=n; i++)ndp[i]=1e9+i;
    ndp[0]=-1e9;
    int mxx=0;
    for(int i=0; i < n; i++){
        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 = n;
        while(l<=r){
            int s = l+r>>1;
            if(ndp[s]<mdp[i+1].S)l=s+1;
            else r=s-1;
        }
        ans=max(ans, mdp[i+1].F+r);
    }
    cout << ans;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:32:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   32 |             int s = l+r>>1;
      |                     ~^~
glo.cpp:55:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   55 |                 int s = l+r>>1;
      |                         ~^~
glo.cpp:63:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   63 |             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