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you forgot to mark visited[1][1]=1, i.e answer should be 0 in case 1x1 grid instead of level[n][m]==0 check for visited[n][m]==0
Hey you mean instead of checking for level[n][m] == 0, I'd check for visited[n][m] == 0 for n = 1,m = 1?
https://ideone.com/w3xJLM
see here what I meant then ask if its not clear.