代码

#include <cstdio>
#include <cctype>

const int N = 30;

int top, stk[N];

void read(int &x) {
    x = 0;
    bool f = false;
    char ch = getchar();
    while(!isdigit(ch)) {
        if(ch == '-')
            f = true;
        ch = getchar();
    }
    while(isdigit(ch)) {
        x = x * 10 + ch - '0';
        ch = getchar();
    }
    if(f)
        x = -x;
}

void write(int x) {
    bool f = false;
    if(x < 0) {
        x = -x;
        f = true;
    }
    do {
        stk[++top] = x % 10;
        x /= 10;
    } while(x);
    if(f)
        putchar('-');
    while(top)
        putchar(stk[top--] + '0');
    putchar('\n');
}

int main() {
    int n;
    read(n);
    for(int i = 1, a, b; i <= n; ++i) {
        read(a), read(b);
        write(a + b);
    }
    return 0;
}

评测结果