题解 | A+B

#include <stdio.h>
int main() {
    for (int a, b, v, c; scanf("%d%c", &a, &c) == 2; printf("%d\n", a + b)) {
        while (c == ',') scanf("%d%c", &v, &c), a = a * 1000 + (a >= 0 ? v : -v);
        scanf("%d%c", &b, &c);
        while (c == ',') scanf("%d%c", &v, &c), b = b * 1000 + (b >= 0 ? v : -v);
    }
}

scanf用%d%c，数字后是逗号就继续，否则下一个数字。

1000进制，考虑符号