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c_cpp
4 years ago
612 B
3
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#include <iostream> #include <vector> using namespace std; int main(){ ios_base::sync_with_stdio(false); int k, n; cin >> k >> n; int a[n], b[n]; vector<int> cnt(105, 0); for(int i = 0; i < n; i++) { cin >> a[i]; } for(int j = 0; j < n; j++) { cin >> b[j]; cnt[b[j]] += 1; } long long result = 0; for(int i = 0; i < n; i++) { int fali = k - a[i]; if(fali < 0) { fali = 0; } for(int j = fali; j <= 100; j++) { result += cnt[j]; } } cout << result << endl; return 0; }
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