Help in a problem

Can some one help me with this problem

Just use a map of pairs. First store {0, 0} ({x, y}) in the map (initial position). Then for each character in the string, simulate the process.
Consider sample 2.
Start at {0, 0}. Then store {0, 1} (because we have ‘N’) in the map and add 5 seconds to the total time sice this pair didn’t exist in the map. Now we have ‘S’. {0, 1-1} = {0, 0} which already exists. Don’t add it again. Since it exists, add 1 second to the total time. Answer = 6.