Snakes and their coup against The mongoose

Snakeland is a well organised city. The houses of the city are organised in an orderly rectangular fashion with dimensions 2 * n, i.e. there are total two rows and n columns. The house in the i-th row and j-th column is also said to be the house at coordinates (i, j). Some of the houses are occupied by snakes, while the others are empty. You are given this information through an array s of dimensi