SIGSEV in Chef and Cake

help
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1

My code is running successfully in Code Blocks, but CodeChef is showing Run time error(SIGSEGV). Why is it so?
Link to my code is CodeChef: Practical coding for everyone

2

You default construct std::string objects in your sample1 and sample2 arrays and then later write to

sample1[j][k]='R';
sample2[j][k]='G';

But you never made sure those strings can hold at least k characters. This is undefined behavior.