This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define fs first
#define sc second
#define pb push_back
void solve() {
int n;
cin>>n;
pii a[n];
for(int i=0;i<n;i++)cin>>a[i].sc>>a[i].fs;
sort(a,a+n);
reverse(a,a+n);
bool vis[n];
memset(vis,0,sizeof(vis));
int ans=0;
for(int i=0;i<n;i++)if(!vis[i]){
ans++;
for(int j=i;j<n;j++){
if(a[i].fs-a[j].fs>=abs(a[i].sc-a[j].sc)){
vis[j]=1;
}
}
}
cout<<ans<<'\n';
}
int main() {
#ifdef FPO
freopen("in","r",stdin);
freopen("out","w",stdout);
#endif
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
solve();
}
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