Add files via upload

Author: black-shadows

Hashing/Contiguous Array.cpp

@@ -0,0 +1,20 @@
+int Solution::solve(vector<int> &A) {
+        int n=A.size();
+    if(n==0)
+        return 0;
+    unordered_map<int,int> mp;
+    int sum=0,ans=0;
+    mp[0]=-1;
+    for(int i=0; i<A.size(); ++i){
+        if(A[i]==0)
+            --sum;
+        else
+            ++sum;
+        if(mp.find(sum)==mp.end())
+            mp[sum]=i;
+        else
+            ans=max(ans,i-mp[sum]);
+    }
+    return ans;
+    
+}