全WA，IDE测了数据是没问题的

yzy0323 @ 2024-02-26 16:48:34

#include <iostream>
#include <algorithm>
using namespace std;
int cal(int num)
{
    int wei = 0;
    if (num == 0)
        return 1;
    while (num >= 1 || num <= -1)
    {
        num /= 10;
        wei++;
    }
    return wei;
}
int main()
{
    int n, a, b, c;
    char ch,cht;
    cin >> n;
    cin >> ch;
    for (int i = 0; i < n; i++)
    {
        cin >> cht;
        int wei;
        if (cht >= '0' && cht <= '9')
        {
            char tnum[10005];
            int j;
            cin.get(tnum+1,10004);
            tnum[0] = cht;
            a = b = 0;
            for (j = 0; tnum[j] != ' '; j++)
                a = a * 10 + tnum[j] - '0';
            while (tnum[++j] != '\0')
            {
                b = b * 10 + tnum[j] - '0';
            }
        }
        else
        {
            cin >> a >> b;
            ch = cht;
        }
        switch (ch)
        {
        case 'a':
            c = a + b;
            wei = cal(a) + cal(b) + cal(c) + 2;
            printf("%d+%d=%d\n%d\n", a, b, c, wei);
            break;
        case 'b':
            c = a - b;
            wei = cal(a) + cal(b) + cal(c) + 2;
            if (c < 0)
                wei++;
            printf("%d-%d=%d\n%d\n", a, b, c, wei);
            break;
        case 'c':
            c = a * b;
            wei = cal(a) + cal(b) + cal(c) + 2;
            printf("%d*%d=%d\n%d\n", a, b, c, wei);
            break;
        }
    }
    return 0;
}

by cpp_xhq @ 2024-03-16 09:57:44

我的代码

#include <bits/stdc++.h>
using namespace std;
int n,x,y;
string a;
int yx=0;
int longlong(int a)
{
    int z=0;
    if(a==0) z=1;
    if(a<=0) z=1;
    while(a)
    {
        a/=10;
        z++;
    }

    return z;
}
int strzint(string a)
{
    int n;
    for(int i=0;i<a.size();i++)
    {
        n=n*10+(a[i]-'0');
    }
    return n;
}
int main()
{
    cin>>n;
    for(int i=0;i<n;i++)
    {
        cin>>a;
        if (a.size()==1&&a[0]>='a'&&a[0]<='c')
        {
            yx=a[0]-'a';//a==0 b==1 c==2;
            cin>>x>>y;
            if (yx==0)
            {
                cout<<x<<"+"<<y<<"="<<(x+y)<<endl;
                cout<<(longlong(x)+longlong(y)+longlong(x+y)+2);
            }else if(yx==1)
            {
                cout<<x<<"-"<<y<<"="<<(x-y)<<endl;
                cout<<(longlong(x)+longlong(y)+longlong(x-y)+2);
            }else
            {
                cout<<x<<"*"<<y<<"="<<(x*y)<<endl;
                cout<<(longlong(x)+longlong(y)+longlong(x*y)+2);
            }
            cout<<endl;
        }else
        {
            x=strzint(a);
            cin>>y;
            if (yx==0)
            {
                cout<<x<<"+"<<y<<"="<<(x+y)<<endl;
                cout<<(longlong(x)+longlong(y)+longlong(x+y)+2);
            }else if(yx==1)
            {
                cout<<x<<"-"<<y<<"="<<(x-y)<<endl;
                cout<<(longlong(x)+longlong(y)+longlong(x-y)+2);
            }else
            {
                cout<<x<<"*"<<y<<"="<<(x*y)<<endl;
                cout<<(longlong(x)+longlong(y)+longlong(x*y)+2);
            }
            cout<<endl;
        }

    }

    return 0;
}

by yzy0323 @ 2024-03-16 09:59:31

@cpp_xhq ch表示当前的表示字符，就是算术的类型，从第二个测试样例开始，输入的第一个字符为cht，同时把后面的数字暂存，然后cht判断是字母还是数字，是字母就更改ch，数字就不用更改。

by cpp_xhq @ 2024-03-16 10:02:37

@yzy0323

if (cht >= '0' && cht <= '9')
第一次应该判断ch

by cpp_xhq @ 2024-03-16 10:04:01

@cpp_xhq 不对

by yzy0323 @ 2024-03-16 10:04:32

@cpp_xhq 谢谢，我也是这个思路

by NTLT60 @ 2024-03-18 14:42:48

@违规用户名971024 大佬牛逼