Comments
-8

Hacking div1A solutions with test

200000 1 1 1 ... 1 1000000000 ... 1000000000

+1

printf is very slow in C11
+3

You have to choose the compiler yourself. Different compilers have different efficiencies (optimizations).
0

Very easy div2 contest.
-13

Why does it start so early?
0

Try: 

 2 2
 1 1
0

Line 61 in b.at(j)