Submission #169989

#	Time	Username	Problem	Language	Result	Execution time	Memory
169989		mhy908	Global Warming (CEOI18_glo)	C++14	17 / 100	70 ms	5484 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;
LL x, arr[200010];
vector<LL> lis, lds;
int dplis[200010], dplds[200010], ans;
int main()
{
    scanf("%d %lld", &n, &x);
    for(int i=1; i<=n; i++)scanf("%lld", &arr[i]);
    for(int i=n; i>=1; i--){
        auto it=lower_bound(lds.begin(), lds.end(), -arr[i]);
        if(it==lds.end())lds.pb(-arr[i]);
        else *it=-arr[i];
        dplds[i]=lds.size();
    }
    for(int i=1; i<=n; i++){
        auto it=lower_bound(lis.begin(), lis.end(), arr[i]);
        if(it==lis.end())lis.pb(arr[i]);
        else *it=arr[i];
        dplis[i]=lower_bound(lis.begin(), lis.end(), dplds[i+1]+x)-lis.begin();
    }
    ans=dplds[1];
    for(int i=1; i<n; i++){
        ans=max(ans, dplis[i]+dplds[i+1]);
    }
    printf("%d", ans);
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:18:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %lld", &n, &x);
     ~~~~~^~~~~~~~~~~~~~~~~~~
glo.cpp:19:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i=1; i<=n; i++)scanf("%lld", &arr[i]);
                            ~~~~~^~~~~~~~~~~~~~~~~

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