// Most asked problems at FAANG companies: https://docs.google.com/spreadsheets/d/1hzP8j7matoUiJ15N-RhsL5Dmig8_E3aP/edit#gid=1377915986 * You are climbing a staircase ...

//Similar to binary search in 1D array, here the search space is from (0,0) to (m-1,n-1) ...