Day 10-q1 solution added

Author: Tech-neophyte

Day 10/Q1: Number of Laser Beams in a Bank/Tech-neophyte--c.md

@@ -0,0 +1,24 @@
+# Approach: 
+Number of beams=number of lasers in current row * number of beams in next non-empty row
+```
+class Solution {
+public:
+    int numberOfBeams(vector<string>& bank) {
+        int count=0;
+        int prev=0;
+        for(int i=0;i<bank.size();i++){
+            int curr=0;
+            for (char c:bank[i]){
+                if (c=='1'){
+                    curr+=1;
+                }
+            }
+            if (curr>0){
+                count+=curr*prev;
+                prev=curr;
+            }
+       }
+       return count;
+    }
+};
+```