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#include <iostream> #include <vector> #include <algorithm> #include <iomanip> #include <cstring> #include <queue> #include <set> #include <cmath> #define ll long long using namespace std; int main() { int t; cin >> t; while(t--) { int n; cin >> n; vector<int> v(n); for(int i = 0; i < n; i++) { cin >> v[i]; } sort(v.begin(), v.end()); v.resize(unique(v.begin(), v.end()) - v.begin()); int j = 0, res = 0; for(int i = 0; i < v.size(); i++) { while(j < v.size() and v[i] - v[j] >= n) { j++; } res = max(res, i - j + 1); } cout << res << endl; } }
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