Dot Product of Two Sparse Vectors
给一个spare vector的类, 求dot product
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class SparseVector { int[] nums; SparseVector(int[] nums) { this.nums = nums; } // Return the dotProduct of two sparse vectors public int dotProduct(SparseVector vec) { int sum = 0; for(int i = 0; i < nums.length; i++) { sum += nums[i] * vec.nums[i]; } return sum; } } // Your SparseVector object will be instantiated and called as such: // SparseVector v1 = new SparseVector(nums1); // SparseVector v2 = new SparseVector(nums2); // int ans = v1.dotProduct(v2); |