Divisible subarray problem-pigeon hole principle code prooblem

#1

please tell why is my below code giving run error for the problem -https://hack.codingblocks.com/practice/p/364/266

solution-https://ide.codingblocks.com/s/78412

#2

RE because values of your sum is going negative . and you are making it index of the array presum.

#3

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