38 lines
680 B
C++
38 lines
680 B
C++
#include "s0704_binary_search.hpp"
|
|
|
|
// 闭区间写法
|
|
int S0704::binSearch1(vector<int>& nums, int target) {
|
|
int len = nums.size();
|
|
int l{0};
|
|
int r = len - 1;
|
|
while (l <= r) {
|
|
int m = (l + r) >> 1;
|
|
if (target < nums[m]) {
|
|
r = m - 1;
|
|
} else if (nums[m] < target) {
|
|
l = m + 1;
|
|
} else {
|
|
return m;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
// 开区间写法
|
|
int S0704::binSearch2(vector<int>& nums, int target) {
|
|
int len = nums.size();
|
|
int l{0};
|
|
int r = len;
|
|
while (l < r) {
|
|
int m = (l + r) >> 1;
|
|
if (target < nums[m]) {
|
|
r = m;
|
|
} else if (nums[m] < target) {
|
|
l = m + 1;
|
|
} else {
|
|
return m;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|