Easy and Simple Solution (using istringstream)
 # Intuition  \n\n\n\n\n\n\n\n\n\n\n\n\n# Code\n\nclass Solution {\npublic:\n    int countSeniors(vector<string>& details) {\n        int  a,count=0;\n        f
<!-- # 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 {\npublic:\n    int countSeniors(vector<string>& details) {\n        int  a,count=0;\n        for(auto ch:details){\n            string s=ch.substr(11,2);\n            istringstream ss(s);\n            ss>>a;\n            if(a>60)count++;\n        }\n        return count;\n    }\n};\n```
['C++']