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def NextSmallerNumber(a):
    if a is None:
        return None

    n = len(a)
    result = [-1] * n
    stack = []

    for i in range(n - 1, -1, -1):
        while stack and stack[-1] >= a[i]:
            stack.pop()

        if stack:
            result[i] = stack[-1]

        stack.append(a[i])

    return result



python

int LetteredNumberSum(char* str, int len) {
    if (str == nullptr) {
        return 0;
    }

    int sum = 0;
    for (int i = 0; i < len; i++) {
        char letter = str[i];
        int ans = 0;
//@ILOVEU_143
        switch (letter) {
            case 'A':
                ans = 1;
                break;
            case 'B':
                ans = 10;
                break;
            case 'C':
                ans = 100;
                break;
            case 'D':
                ans = 1000;
                break;
            case 'E':
                ans = 10000;
                break;
            case 'F':
                ans = 100000;
                break;
            case 'G':
                ans = 1000000;
                break;
            default:
                ans = 0;
                break;
        }

        sum += ans;
    }

    return sum;
}

C++

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16 D

15 B

17 C

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