10943 - How do you add?

Difficulty : medium

Solution Description :

DP problem

set ways[1][1]=1, ways[1][2]=2, ways[1][3]=3, ......... ways[1][100]=100
set ways[1 to 100][1] = 1

and ways[i][j] = ways[i-1][j] + ways[i][j-1] (Here range of i & j [2,100])