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#include <bits/stdc++.h> using namespace std; int main() { int n; cin >> n; pair<int, int> brod[n]; for (int i = 0; i < n; i++) { cin >> brod[i].second >> brod[i].first; } sort(brod,brod + n); int L = brod[0].first - brod[0].second; int R = brod[0].first; int res = 1; for(int i = 1; i < n;i++) { int l = brod[i].second; int p = brod[i].first; if (p >= R) { L = max(p - l, R); R = L + l; res++; } else { int x = max(p, L + l); if (x < R) { R = x; } } } cout << res << endl; return 0; }
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