ACM Problem Solution

acm problem and solution :     100 : 3n+1 problem
acm problem and solution :     102 : Ecological bin packing 
acm problem and solution :     105 : The Skyline Problem
acm problem and solution :     111: History Grading 
acm problem and solution :     112: Tree Summing 
acm problem and solution :     113 - Power of Cryptography 
acm problem and solution :     119 - Greedy Gift Givers
acm problem and solution :     136: ugly number