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1. Fast I/O

    std::ios_base::sync_with_stdio(false);
   

Or use getchar_unlocked() and putchar_unlocked() (this should do it)

getchar_unlocked > scanf > cin

2. Use std::sort over qsort

1. Fast I/O

    std::ios_base::sync_with_stdio(false);
   

Or use getchar_unlocked() and putchar_unlocked() (this should do it)

getchar_unlocked > scanf > cin

2. Use std::sort over qsort

1. FAST IO

   std::ios_base::sync_with_stdio(false);

Or use getchar_unlocked() and putchar_unlocked() (This should do it)

getchar_unlocked > scanf > cin

2. Use std::sort over quick sort. (http://stackoverflow.com/questions/4708105/performance-of-qsort-vs-stdsort)

1. Fast I/O

    std::ios_base::sync_with_stdio(false);
   

Or use getchar_unlocked() and putchar_unlocked() (this should do it)

getchar_unlocked > scanf > cin

2. Use std::sort over qsort

1. FAST IO

std::ios_base::sync_with_stdio(false);

Or use getchar_unlocked() and putchar_unlocked() (This should do it)

2. Use std::sort over quick sort. (http://stackoverflow.com/questions/4708105/performance-of-qsort-vs-stdsort)

1. FAST IO

   std::ios_base::sync_with_stdio(false);

Or use getchar_unlocked() and putchar_unlocked() (This should do it)

getchar_unlocked > scanf > cin

2. Use std::sort over quick sort. (http://stackoverflow.com/questions/4708105/performance-of-qsort-vs-stdsort)