Hello, I was trying to solve a problem 1615E - Purple Crayon from the latest Global round, and my solution is somehow failing at the first big test. I get RE with exit code 2147483647 (I assume it is -1, but fitted in unsigned int type). Can someone please tell what could be the reason of the error?

Here is my submission: 140965891

Sorry for a very specific question, but i've checked my code multple times and haven't found anything suspicious.