The numbers 11, 33, 66, 1010, 1515, 2121, 2828, 3636, 4545 and t_i=\frac{1}{2}i(i+1)ti=21i(i+1), are called half-consecutive. For given NN, find the smallest rr which is no smaller than NN
number number number Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Problem Description We define a sequence F : ⋅ F0=0,F1=1 ; ⋅ Fn=Fn