Luogu P1420 longest connection number and p1420 longest connection number

Luogu P1420 longest connection number and p1420 longest connection number
Description

Enter n positive integers (1 <= n <= 10000). The maximum length of the serial number is required. (Serial numbers refer to continuous natural numbers from small to large)

Input/Output Format

Input Format:

 

The first line is a number n;

The second line contains n positive integers separated by spaces.

 

Output Format:

 

The maximum number of connections.

 

Input and Output sample input sample #1:

103 5 6 2 3 4 5 6 8 9           

Output sample #1:

5

For the first time, I had to score 20 points ..
I feel that I need to think about 233333 of my life.

Do not forget to set now to 1 when the if statement is invalid.

 1 #include<iostream> 2 #include<cstdio> 3 #include<cstring> 4 #include<cmath> 5 #define ls k<<1 6 #define rs k<<1|1 7 using namespace std; 8 const int MAXN=400400; 9 inline void read(int &n)10 {11     char c=getchar();n=0;bool flag=0;12     while(c<'0'||c>'9')    c=='-'?flag=1,c=getchar():c=getchar();13     while(c>='0'&&c<='9')    n=n*10+c-48,c=getchar();flag==1?n=-n:n=n;14 }15 int a[MAXN];16 int main()17 {18     int n;19     read(n);20     for(int i=1;i<=n;i++)    read(a[i]);21     int now=1;22     int ans=1;23     for(int i=1;i<=n-1;i++)24     {25         if(a[i+1]-a[i]!=1)26             ans=max(ans,now),now=1;27         else now++;28     }29     printf("%d",ans);30     return 0;31 }