Solution:
#include <bits/stdc++.h> using namespace std; /* * * Prosen Ghosh * American International University - Bangladesh (AIUB) * */ #define IFOR for(int i = 0; i < n; i++) #define VMINPUT(){ cin >> a;v.push_back(a);m[a] = true;} int main() { int n,d,a,cnt = 0; cin >> n >> d; vector<int>v; map<int,bool>m; IFOR VMINPUT() IFOR if(m[v[i]+d] && m[v[i]+d+d])cnt++; cout << cnt << endl; return 0; }
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