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#include <iostream> using namespace std; int main() { int k,a,n; long long I=0; cin>>k >>n; int niza1[n],niza2[n]; long long brojac[105]; for(int i = 0; i <= 100; i++) { brojac[i] = 0; } for(int i=0;i<n;i++) { cin>>niza1[i]; } for(int j=0;j<n;j++) { cin>>niza2[j]; brojac[niza2[j]]++; } for(int i = 0; i < n; i++) { int fali = k - niza1[i]; if(fali < 0) { fali = 0; } for(int j = fali; j <= 100; j++) { I += brojac[j]; } } cout << I << endl; return 0; } /* 4 5 7 5 3 4 2 4 3 2 2 1 2, 3, 4, 5, 7 1, 2, 2, 3, 4 4 + 5 + 5 + 5 + 5 = 24 */
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