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#include <fstream> using namespace std; ifstream cin("bomber.in"); ofstream cout("bomber.out"); int n , I; struct bomba{ int x, y, p; bool explodat = false; void citire() { cin>>x>>y>>p; } }v[10001]; int distP(int a, int b) { int x = v[a].x - v[b].x; int y = v[a].y - v[b].y; return (x*x + y*y); } void explode(int poz) { v[poz].explodat = true; for(int i = 1;i<=n;i++) { if(!v[i].explodat) { if(distP(poz,i) <= v[poz].p*v[poz].p) explode(i); } } } int main() { cin>>n>>I; for(int i = 1;i<=n;i++) v[i].citire(); explode(I); int cnt = 0; for(int i = 1;i<=n;i++) if(!v[i].explodat) cnt++; cout << cnt; return 0; }
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