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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.  
  12.     cin >> target;
  13.     int first = -1, last = -1;
  14.     for(int l = 0, r = n - 1; l <= r; ) {
  15.         int mid = (l + r) / 2;
  16.         if(nums[mid] >= target){
  17.             if(nums[mid] == target) first = mid;
  18.             r = mid - 1;
  19.         } else {
  20.             l = mid + 1;
  21.         }
  22.     }
  23.     ans.push_back(first);
  24.     for(int l = 0, r = n - 1; l <= r; ) {
  25.         int mid = (l + r) / 2;
  26.         if(nums[mid] <= target){
  27.             if(nums[mid] == target) last = mid;
  28.             l = mid + 1;
  29.         } else {
  30.             r = mid - 1;
  31.         }
  32.     }
  33.     ans.push_back(last);
  34.     for(auto it : ans) cout << it << " ";
  35.     cout << endl;
  36. }
  37.  
  38.  
Success #stdin #stdout 0.01s 5312KB
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https://ideone.com/oV77tU
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language:
C++ (gcc 8.3)
created:
8 hours ago
visibility:
public

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