Bridging signals pku1631

Bridging signals pku1631

#include < iostream >
using   namespace  std;

int  t;
int  n,a;
int  size;
int  c[ 40001 ];
int  cal( int  ai){
     int  l = 0 ,r = size - 1 ;
     while (l <= r){
         int  mid = (l + r) >> 1 ;
         if (a > c[mid - 1 ] && a <= c[mid])  return  mid;
         else   if (a > c[mid]) l = mid + 1 ;
         else  r = mid - 1 ;
    }
}
int  main()
{
    scanf( " %d " , & t);
     while (t -- ){
        scanf( " %d%d " , & n, & a); n -- ;
        c[ 0 ] = a; size = 1 ;
         while (n -- ){
            scanf( " %d " , & a);
             int  j;
             if (a <= c[ 0 ]) j = 0 ;
             else   if (a > c[size - 1 ]) j = size ++ ;
             else  j = cal(a);
            c[j] = a;
        }
        printf( " %d\n " ,size);
    }
     return   0 ;
}