1179: Sum Time Limit: 10 Sec Memory Limit: 128 MB SUBMIT: 773 Solved: 118 [SUBMIT] [STATUS] Description Here is an easy problem.It is so easy that you just need to solve a sum: ∑min(k,max(0,x-k)).The index k is an integer,sum from 0 to +inf. Give you real x,you should evaluate the sum.