don't know how should i react knowing that I'm not alone :/ this thing cost me the entire round, I wasn't able to figure out how this could be wrong. I thought to move to other problems but B got my mind and i got stuck at it for long time. I tried many times changing the code lil bit but it didn't help and made me write a whole different code after wasting a amount of time in which i should've solved all the other problems i solved in the round. After the contest, I again came back to this, added few lines and got AC just to find out that it was all due to the uninitialized map............. Lesson learnt -> always initialize maps :)