JAVA | 98.55 %
Intuition\n Describe your first thoughts on how to solve this problem. \n\n# Approach\n Describe your approach to solving the problem. \n\n# Complexity\n- Time 
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```\nclass Solution {\n    public int numberOfBeams(String[] bank) {\n        int x = 0, y = 0, sum = 0;\n        for(String s : bank){\n            if(x != 0)\n                y = x;\n            x = 0;\n            for(char c : s.toCharArray()){\n                x += c - \'0\';\n            }\n            sum += x*y;\n        }\n        return sum;\n    }\n}\n```
['Java']