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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int n, target;
  6.     cin >> n;
  7.     vector<int> ans, nums(n);
  8.     for(int i = 0; i < n; i++){
  9.         cin >> nums[i];
  10.     }
  11.     cin >> target;
  12.     int first = -1, last = -1;
  13.     for(int l = 0, r = n - 1; l <= r; ) {
  14.         int mid = (l + r) / 2;
  15.         if(nums[mid] >= target){
  16.             if(nums[mid] == target) first = mid;
  17.             r = mid - 1;
  18.         } else {
  19.             l = mid + 1;
  20.         }
  21.     }
  22.     ans.push_back(first);
  23.     for(int l = 0, r = n - 1; l <= r; ) {
  24.         int mid = (l + r) / 2;
  25.         if(nums[mid] <= target){
  26.             if(nums[mid] == target) last = mid;
  27.             l = mid + 1;
  28.         } else {
  29.             r = mid - 1;
  30.         }
  31.     }
  32.     ans.push_back(last);
  33.     for(auto it : ans) cout << it << " ";
  34.     cout << endl;
  35. }
  36.  
  37.  
  38.  
  39.  
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/lA7cHj
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language:
C++ (gcc 8.3)
created:
8 hours ago
visibility:
public

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