Submission #170006

#	Time	Username	Problem	Language	Result	Execution time	Memory
170006		mhy908	Global Warming (CEOI18_glo)	C++14	100 / 100	89 ms	5880 KiB

glo

#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define F first
#define S second
using namespace std;
typedef long long LL;
typedef pair<int, int> pii;
typedef pair<LL, LL> pll;
const LL llinf=9000000000000000000;
const int inf=2000000000;
int n, x;
int lis[200010], lds[200010], ans, arr[200010];
pair<int, int> change[200010];
int main()
{
    scanf("%d %d", &n, &x);
    for(int i=1; i<=n; i++){
        scanf("%d", &arr[i]);
        lis[i]=inf;
    }
    for(int i=1; i<=n; i++){
        int it=lower_bound(lis+1, lis+n+1, arr[i])-lis;
        change[i]=mp(it, lis[it]);
        lis[it]=arr[i];
        ans=max(ans, it);
    }
    for(int i=n; i>=1; i--){
        int it=lower_bound(lds+1, lds+n+1, -arr[i])-lds;
        lds[it]=-arr[i];
        lis[change[i].F]=change[i].S;
        int jt=lower_bound(lis+1, lis+n+1, arr[i]+x)-lis-1;
        ans=max(ans, it+jt);
    }
    printf("%d", ans);
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &x);
     ~~~~~^~~~~~~~~~~~~~~~~
glo.cpp:19:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &arr[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