Submission #129014

#	Time	Username	Problem	Language	Result	Execution time	Memory
129014		arnold518	Global Warming (CEOI18_glo)	C++14	100 / 100	85 ms	5752 KiB

glo

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 2e5;
const int INF = numeric_limits<int>::max();

int N, X, A[MAXN+10];
int lis[MAXN+10], lds[MAXN+10], ans;
pii change[MAXN+10];

int main()
{
    int i, j;

    scanf("%d%d", &N, &X);
    for(i=1; i<=N; i++) scanf("%d", &A[i]);

    for(i=1; i<=N; i++) lis[i]=INF;
    for(i=1; i<=N; i++)
    {
        int it=lower_bound(lis+1, lis+N+1, A[i])-lis;
        change[i]={it, lis[it]};
        lis[it]=A[i];
        ans=max(ans, it);
    }

    for(i=N; i>=1; i--)
    {
        int it=lower_bound(lds+1, lds+N+1, A[i]+X, greater<int>())-lds;
        lds[it]=A[i]+X;
        lis[change[i].first]=change[i].second;
        int jt=lower_bound(lis+1, lis+N+1, A[i]+X)-lis-1;
        ans=max(ans, it+jt);
    }
    printf("%d", ans);
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:17:12: warning: unused variable 'j' [-Wunused-variable]
     int i, j;
            ^
glo.cpp:19:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &N, &X);
     ~~~~~^~~~~~~~~~~~~~~~
glo.cpp:20:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(i=1; i<=N; i++) scanf("%d", &A[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