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main.cpp
int binarySearch(vector<int>& arr, int target) {
  int lo = 0, hi = arr.size()-1;
  while (lo <= hi) {
    int mid = lo + (hi-lo)/2;
    if (arr[mid] == target) return mid;
    else if (arr[mid] < target) lo = mid+1;
    else hi = mid-1;
  }
  return -1;
}

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