题解 | #大数加法#

package main
import "strconv"

func solve( s string ,  t string ) string {
    tmp, n, m := 0, len(s)-1, len(t)-1
    result := ""
    
    for n >= 0 || m >= 0 || tmp != 0 {
        i, j := 0, 0
        if n >= 0 {
            i = int(s[n] - '0')
            n--
        }
        if m >= 0 {
            j = int(t[m] - '0')
            m--
        }
        tmp += i + j
        result = strconv.Itoa(tmp%10) + result
        tmp = tmp / 10
    }
    return result
}