func_code_string: #include <bits/stdc++.h>   using namespace std;   using ll = long long;   using pii = pair<int, int>;   const int MOD = 1000000007;   vector<pii> ree;   signed main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     int n;     cin >> n;     for (int i = (0); i < (n); i++) {       int x, v;       cin >> x >> v;       ree.push_back({x + v, x - v});     }     sort(ree.begin(), ree.end());     int cl = -2e9, a = 0;     for (int i = (0); i < (n); i++)       if (cl <= ree[i].second) cl = ree[i].first, a++;     cout << a << endl;   }   