func_code_string: #include <bits/stdc++.h>   using namespace std;   pair<int, int> arr[200010];   int a, b, ans = 1;   int main() {     pair<int, int> arr[200010];     int n;     cin >> n;     for (int i = 0; i < n; i++)       cin >> a >> b, arr[i].first = a + b, arr[i].second = a - b;     sort(arr, arr + n);     int tmp = arr[0].first;     for (int i = 1; i < n; i++)       if (arr[i].second >= tmp) ans++, tmp = arr[i].first;     cout << ans;   }   