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#include <iostream> #include <algorithm> #include <vector> using namespace std; int main() { int k, n; cin >> k >> n; vector<int> a(n), b(n); for(int i = 0; i < n; i++) { cin >> a[i]; } for(int i = 0; i < n; i++) { cin >> b[i]; } sort(a.begin(), a.end()); sort(b.begin(), b.end()); long long result = 0; for(int i = 0; i < n; i++) { int x = k - a[i]; int L = 0, R = n; while(L < R) { int middle = L + (R - L) / 2; if(x <= b[middle]) { R = middle; } else { L = middle + 1; } } if(L < n and b[L] < x) { L++; } if(b[L] >= x) { result += (n - L); } } cout << result << endl; return 0; } // 2 2 3 3 4 4
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