C++ properly explained with comments
\n\n# Code\n\nclass Solution {\npublic:\n    vector<int> plusOne(vector<int>& digits) {\n      int n = digits.size() - 1;\n      \n      for (int i = n; i >= 0;
\n\n# Code\n```\nclass Solution {\npublic:\n    vector<int> plusOne(vector<int>& digits) {\n      int n = digits.size() - 1;\n      \n      for (int i = n; i >= 0; --i) { // traverse digits from the last element (least significant)\n        // since we begin with the last digit, increasing that digit by one\n        // results in overflow.  Therefore, all elements PRIOR to digits[0]\n        // need to be considered since there may be additional nines between\n        // digits[0], ... , digits[n].\n        if (digits[i] == 9) {  \n          digits[i] = 0;\n        } else {  // current digit is not 9 so we can safely increment by one\n          digits[i] += 1;\n          return digits;\n        }\n      }\n      // if the program runs to this point, each 9 is now a 0.\n      // to get a correct solution, we need to add one more element with \n      // a value of zero AND set digits[0] to 1 (in the most significant position)\n      // to account for the carry digit.\n      digits.push_back(0);\n      digits[0] = 1;\n      return digits;\n    }\n};\n\n```\n**Please upvote if it helped. Happy Coding**
['C++']