f338. 2. 后羿射日(Archer) -- TOI2020年8月新手同好會 | From: [203.72.178.1] | 發表日期 : 2024-04-11 17:52

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#include <bits/stdc++.h>

using namespace std;

 

int main()

{

int ax,ay,al,r;

cin>>ax>>ay>>al>>r;

int n;

cin>>n;

int sum=0;

for(int i=1; i<=n; i++){

int x,y,l,d;

cin>>x>>y>>l;

d=(ax-x)*(ax-x)+(ay-y)*(ay-y);

if((d<=r*r) && (al>=l)) sum+=1;

}

cout<<sum<<endl;

 

}