#include <bits/stdc++.h> using namespace std ; typedef long long ll ; typedef long double ld ; typedef pair<int, int> pii ; typedef pair<int, long long> pil ; typedef pair<long long, int> pli ; typedef pair<long long, long long> pll ; #define bitc(n) (__builtin_popcountll(n)) #define clz(n) (__builtin_clzll(n)) #define ctz(n) (__builtin_ctzll(n)) #define lgi(n) (31 - __builtin_clz(n)) #define lgl(n) (63 - __builtin_clzll(n)) #define MASK(k) (1ll << (k)) #define getbit(n, k) ((n) >> (k) & 1) #define flipbit(n, k) ((n) ^ (1ll << (k))) #define ton(n, k) ((n) | (1ll << (k))) #define toff(n, k) ((n) & ~(1ll << (k))) #define fi first #define se second #define mp make_pair #define eb emplace_back #define lwb lower_bound #define upb upper_bound #define sz(x) (int)(x.size()) #define all(x) x.begin(),x.end() #define taskname "input" template<class X, class Y> bool maximize(X &x, const Y &y) { if(x < y) { return x = y, true ; } return false ; } template<class X, class Y> bool minimize(X &x, const Y &y) { if(x > y) { return x = y, true ; } return false ; } template<class X> void removeDup(vector<X> &ve) { sort(ve.begin(), ve.end()) ; ve.resize(unique(ve.begin(), ve.end()) - ve.begin()) ; } const ll INF = 1e18 ; const int inf = 1e9 ; const int mod = 1e9 + 7 ; const int N = 1e5 + 5, LG = 17 ; /* Some Peach Tea Is Great ;-; */ /* Author : Tuandq */ int n ; vector<pii> lst ; void kittncool() { cin >> n ; for(int i = 1; i <= n; i ++) { int x, e ; cin >> x >> e ; lst.emplace_back(x, e) ; } removeDup(lst) ; sort(all(lst), [&](auto u, auto v) { if(u.se == v.se) return u.fi > v.fi ; return u.se > v.se ; }) ; int t = 0 ; for(int i = 0; i < sz(lst); i ++) { int cn = 0 ; for(int j = 0; j < sz(lst); j ++) if(i != j) { if(abs(lst[j].fi - lst[i].fi) <= lst[j].se - lst[i].se) ++ cn ; } if(!cn) ++ t ; // if(!cn) cerr << i << ' ' ; } cout << t ; return ; // cerr << endl ; int res = 0 ; ll add = -INF, sub = -INF ; for(auto [x, e] : lst) { bool f = maximize(add, 1ll * e + x) ; bool g = maximize(sub, 1ll * e - x) ; if(f || g) ++ res ; cerr << "-> " << x << ' ' << e << ' ' << " | " << add << ' ' << sub << ' ' << res << endl ; } cout << res ; } signed main() { ios_base::sync_with_stdio(0) ; cin.tie(0) ; cout.tie(0) ; if(fopen(taskname".inp", "r")) { freopen(taskname".inp", "r", stdin) ; freopen(taskname".out", "w", stdout) ; } int t = 1 ; //cin >> t ; while(t --) { kittncool() ; } }

Main.cpp: In function 'int main()':
Main.cpp:105:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  105 |         freopen(taskname".inp", "r", stdin) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:106:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  106 |         freopen(taskname".out", "w", stdout) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~