프로그래머스lv1 - 내적

https://programmers.co.kr/learn/courses/30/lessons/70128

class Solution {      
public int solution(int[] a, int[] b) { 
int answer = 0;        
for (int i = 0; i < a.length; i++) { 
answer += (a[i] * b[i]);             } 
return answer;      
} 
}

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