Create 930. Binary Subarrays With Sum (#428)

Author: Chayandas07

930. Binary Subarrays With Sum

@@ -0,0 +1,31 @@
+class Solution {
+
+public:
+
+    int numSubarraysWithSum(vector<int>& nums, int goal) {
+
+        unordered_map<int,int> mpp;
+
+        int sum = 0;
+        int cnt = 0;
+
+        for(auto i:nums)
+        {
+            sum+=i;
+            if(sum==goal) cnt++;
+            if(mpp.find(sum-goal)!=mpp.end())
+
+            {
+
+                cnt+=mpp[sum-goal];
+
+            }
+           mpp[sum]++;
+
+        }
+
+        return cnt;
+
+    }
+
+};