static int minJobSpeed ( int [ ] A , int n , int H ) {
  if ( H < n ) return - 1 ;
  int max = findmax ( A ) ;
  int lo = 1 , hi = max ;
  while ( lo < hi ) {
    int mi = lo + ( hi - lo ) / 2 ;
    if ( ! isPossible ( A , n , H , mi ) ) lo = mi + 1 ;
    else hi = mi ;
  }
  return lo ;
}

static int minJobSpeed ( int [ ] A , int n , int H ) { if ( H < n ) return - 1 ; int max = findmax ( A ) ; int lo = 1 , hi = max ; while ( lo < hi ) { int mi = lo + ( hi - lo ) / 2 ; if ( ! isPossible ( A , n , H , mi ) ) lo = mi + 1 ; else hi = mi ; } return lo ; }
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