The most horrible onliner in C you even have seen :-) Use gcc -E to generate the code... This code just return true if a solution exist. This code solves the problem of the "count down number" http://en.wikipedia.org/wiki/Countdown_ 28game_show

背包问题(Knapsack problem)是一种组合优化的NP完全问题-used the c++ for parket problem