one productive day throw away 1000 line code Ken ThompsonFibonacci addition operation array x integer parametrize indice l r Fibonacci addition increase x_l f_1 increase x_l 1 F_2 X_r increase F_r l 1f_i denote ith Fibonacci number f_1 1 f_2 1 f_i f_i 1 f_i 2 2 operation perform modulo MODYou give array a b length we ask perform Fibonacci addition array different parameter operation report array a b equal modulo MOD