IT公司100题-14-排序数组中和为给定值的两个数字

 1 // 14.cc
 2 #include
 3 using namespace std;
 4 
 5 bool find_two(int* a, size_t size, int target, int& t1, int& t2) {
 6     bool flag = false;
 7     if (size < 2)
 8         return flag;
 9 
10     size_t low = 0;
11     size_t high = size - 1;
12 
13     while (low < high) {         int s = a[low] + a[high];         if (s > target)
14             high--;
15         else if (s < target)
16             low++;
17         else {
18             t1 = a[low];
19             t2 = a[high];
20             flag = true;
21             return flag;
22         }
23     }
24     return flag;
25 }
26 
27 int main() {
28     int a[] = {1, 3, 4, 5, 13, 17};
29     int size = sizeof(a) / sizeof(int);
30     int target = 20;
31     int t1, t2;
32     bool flag = find_two(a, size, target, t1, t2);
33     if (flag)
34         cout << t1 << " + " << t2 << " = " << target << endl;
35     else
36         cout << "can not find t1 and t2." << endl;
37     return 0;
38 }