算法| Algorithmstd::upper_bound std::upper_bound Defined in header <algorithm> template< class ForwardIt, class T > ForwardIt upper_bound( ForwardIt first, ForwardIt last, const T& value ); (1) template< class ForwardIt, class T, class Compare > ForwardIt upper_bound( ...
如果是,你就可以通过binary_search、lower_bound、upper_bound和equal_range来加速(通常是对数时间——参见条款34) 搜索。如果迭代器并没有划分一个有序区间,你就只能用线性时间的算法count、count_if、find和find_if。在下文中,我会忽略掉 count和find是否有_if的不同,就像我会忽略掉binary_search、lower_bound...
在函数*upper_bound(nums.begin(), nums.end(), 3)的返回值中,指向了4也就是大于3的数,从upper_bound(nums.begin(), nums.end(), 3) - nums.begin()中可以看出返回来了3也就是第一个4的下标,因此upper_bound()函数可以理解为:大于目标元素的第一个数/位置。 翻出来源码验证一下: /** * 以下程...
#include <iostream>#include<algorithm>usingnamespacestd;intd[] = {1,2,3,3,4,5};intmain(){//第一个大于 3 的元素为 d[4] = 4 > 3, 故输出 4cout<< upper_bound(d, d+6,3) - d <<endl;//d 数组所有元素都小于 6, 故输出 last = 6cout<< upper_bound(d, d+6,6) - d <<...
总所周知:smile:,C++的upper_bound()函数是查找一个非减序列中位于指定元素后的第一个元素的函数。查找网上资料,发现该函数是通过二分查找实现的。但是,upper_bound()查找的元素集合还可以是链表(比如,下面代码是可以执行的): #include <iostream> #include <algorithm> #include <list> using namespace std; ...
upper_bound's return value is the iterator for the first element in the container that is greater than value, or, when the comparison operator is used, the first element that does NOT satisfy the comparison function. Because the algorithm is restricted to using the less than operator or the...
在C++语言标准库<algorithm><algorithm>中,提供了lower_boundlower_bound、upper_boundupper_bound、binary_searchbinary_search、equal_rangeequal_range四个用于在有序的序列容器中进行查找的函数。lower_boundlower_bound、upper_boundupper_bound算是这里面的“基本功能”,lower_boundlower_bound返回大于或等于(≥≥)指...
upper = upper_bound(v.begin(), v.end(), 7); if (upper != v.end()) cout <<"\nUpper bound of 7 in v = "<<*upper; upper = upper_bound(v.begin(), v.end(), 0); if (upper != v.end()) cout <<"\nUpper bound of 0 in v = "<<*upper; upper = upper_bound(v.beg...
An upper-bound algorithm for gate-level delay analysis dynamically updates path timing information. When conflicting logic value occurs, the algorithm switches to the most promising path according to the updated path delay. The execution time has been greatly shortened by reducing the number of paths...
最后说一点使用的注意事项，先看这么一句话“ The elements in the range shall already be sorted according to this same criterion (operator< or comp), or at least partitioned with respect to val”（引用自http://www.cplusplus.com/reference/algorithm/upper_bound/）。简单来说，如果你用...