Abstract: The change-making problem is to represent a given value with the fewest coins under a given coin system. As a variation of the knapsack problem, it is known to be NP-hard. Nevertheless, ...

To combat the flight of silver from the national stockpile at West Point, I.Y., I resident Johnson last week pro posed the first basic change in U.S. coin age since Alexander Hamilton adopted silver ...

Abstract: To assist Java programming learning of novice students, we have developed the web-based Java Programming Learning Assistant System (JPLAS). It provides various exercise problems to cultivate ...

New data compiled by the E.P.A. shows how global warming is making life harder for Americans in myriad ways that threaten their health, safety and homes. By Christopher Flavelle WASHINGTON — Wildfires ...