C++ / NO MOD NO MULTI , ONLY ADD / simple solution
\nclass Solution {\npublic:\n    int smallestEqual(vector<int>& nums) {\n        int idx = 0;\n        for (int i = 0 ; i < nums.size(); ++i) {\n            if 
```\nclass Solution {\npublic:\n    int smallestEqual(vector<int>& nums) {\n        int idx = 0;\n        for (int i = 0 ; i < nums.size(); ++i) {\n            if (idx == nums[i]) {\n                return i;\n            }\n            if (++idx == 10) {\n                idx = 0;\n            }\n        }\n        return -1;\n    }\n};\n```
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