C++ | Leetcode C++题解之第560题和为K的子数组
题目：
题解：
class Solution {
public:
int subarraySum(vector<int>& nums, int k) {
unordered_map<int, int> mp;
mp[0] = 1;
int count = 0, pre = 0;
for (auto& x:nums) {
pre += x;
if (mp.find(pre - k) != mp.end()) {
count += mp[pre - k];
}
mp[pre]++;
}
return count;
}
};