Why I do often get Time limit exceeded?

Question

While running code here on an Android phone , and most of the time it's quite slow. Connectivity is good, either vdsl or Lte

Answer 1

@Maart could you elaborate why to prefer printf/scanf over cin/cou ?

Answer 2

It could be because you have too many loops in a loop.

Otherwise try:
If you work with C++, use scanf/printf instead of cin/cout. Use BufferedReader instead of Scanner in Java.