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								23/11/Q2342.h
									
									
									
									
									
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								23/11/Q2342.h
									
									
									
									
									
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#ifndef LEECODE_C_Q2342_H
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#define LEECODE_C_Q2342_H
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#include <vector>
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#include <map>
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using namespace std;
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int maximumSum(vector<int> &nums)
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{
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    int ans = -1;
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    int mx[82]{}; // 至多 9 个 9 相加
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    for (int num : nums)
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    {
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        int s = 0; // num 的数位和
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        for (int x = num; x; x /= 10)
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        { // 枚举 num 的每个数位
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            s += x % 10;
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        }
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        if (mx[s])
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        {                                // 说明左边也有数位和等于 s 的元素
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            ans = max(ans, mx[s] + num); // 更新答案的最大值
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        }
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        mx[s] = max(mx[s], num); // 维护数位和等于 s 的最大元素
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    }
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    return ans;
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}
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#endif LEECODE_C_Q2342_H
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