#include <time.h
This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.，这一点在WPS官方版本下载中也有详细论述
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while (stack.length 0 && stack[stack.length - 1] <= cur) {
Twenty-five others were injured in the pre-dawn crash in the Himalayan foothills on Monday. The bus was carrying 44 people, including a number of tourists.