leetcode

Solution to some Leetcode problems written in C++

git clone git://git.dimitrijedobrota.com/leetcode.git

0454.cpp (607B)

0 class Solution { 1 public: 2 int fourSumCount(const vector<int> &nums1, const vector<int> &nums2, const vector<int> &nums3, 3 const vector<int> &nums4) const { 4 const int n = size(nums1); 5 unordered_map<int, int> um; 6 int res = 0; 7 8 for (int i = 0; i < n; i++) { 9 for (int j = 0; j < n; j++) { 10 um[nums1[i] + nums2[j]]++; 11 } 12 } 13 14 for (int i = 0; i < n; i++) { 15 for (int j = 0; j < n; j++) { 16 res += um[-(nums3[i] + nums4[j])]; 17 } 18 } 19 20 return res; 21 } 22 };