之前用python处理数据输入错了，误以为python大整数比较会超时，写了c++这种类型的的解法😭

ps: python终于能渲染出来了😋

from math import sqrt,ceil,gcd,log;re=lambda:map(int,input().split())

while True:
    a, b = input().split()
    if a == '0' and b == '0':
        break
    else:
        if a[0] == '-' and b[0] != '-':
            print("a<b")
        elif a[0] != '-' and b[0] == '-':
            print("a>b")
        elif a[0] == '-' and b[0] == '-':
            aa = len(a)
            bb = len(b)
            if aa > bb:
                print("a<b")
            elif aa < bb:
                print("a>b")
            else:
                same = True
                for i in range(1, aa):
                    if a[i] > b[i]:
                        print("a<b")
                        same = False
                        break
                    elif a[i] < b[i]:
                        print("a>b")
                        same = False
                        break
                if same:
                    print("a==b")
        else:
            aa = len(a)
            bb = len(b)
            if aa > bb:
                print("a>b")
            elif aa < bb:
                print("a<b")
            else:
                same = True
                for i in range(aa):
                    if a[i] > b[i]:
                        print("a>b")
                        same = False
                        break
                    elif a[i] < b[i]:
                        print("a<b")
                        same = False
                        break
                if same:
                    print("a==b")

使用字符串比较，先判断正负号，再比较位数，注意两数都为负数时的比较；

#include<stdio.h>
#include<string.h>
int i,j,lennum1,lennum2;
char num1[10009],num2[10009];
int main(void){
	while(1){
		scanf("%s %s",num1,num2);
		if(strcmp(num1,"0")==0 && strcmp(num2,"0")==0){
			break;
		}
		if(strcmp(num1,num2)==0){
			printf("a==b\n");
		}else{
		lennum1=strlen(num1);
		lennum2=strlen(num2);
		if(num1[0]=='-' && num2[0]!='-'){
			printf("a<b\n");
		}
		if(num1[0]!='-' && num2[0]=='-'){
			printf("a>b\n");
		}
		if(num1[0]=='-' && num2[0]=='-'){
			if(lennum1>lennum2){
				printf("a<b\n");
			}
			if(lennum1<lennum2){
				printf("a>b\n");
			}
			if(lennum1==lennum2){
				for(i=lennum1-1;i>0;i--){
					if(num1[i]>num2[i]){
						printf("a<b\n");
						break;					
					}
					if(num1[i]<num2[i]){
						printf("a>b\n");
						break;
					}
				}
			}
		}
		if(num1[0]!='-' && num2[0]!='-'){
			if(lennum1>lennum2){
				printf("a>b\n");
			}
			if(lennum1<lennum2){
				printf("a<b\n");
			}
			if(lennum1==lennum2){
				for(i=lennum1-1;i>=0;i--){
					if(num1[i]>num2[i]){
						printf("a>b\n");
						break;					
					}
					if(num1[i]<num2[i]){
						printf("a<b\n");
						break;
					}
				}
			}
		}	
	}
	}
}

#include<stdio.h>
#include<string.h>
int main()
{
    char a[1000]= {0},b[1000]= {0};
    while(scanf("%s%s",a,b)!=EOF)
    {
        if(a[0]=='0'&&b[0]=='0')
            break;
        int i,j,k,l,max,t=2;
        k=strlen(a);
        l=strlen(b);
        if(a[0]=='-'&&b[0]!='-')
            t=1;
        else if(a[0]!='-'&&b[0]=='-')
            t=0;
        else if(a[0]!='-'&&b[0]!='-')
        {
            if(k>l)
                t=0;
            if(k<l)
                t=1;
            if(k==l)
            {
                for(i=0; i<l; i++)
                {
                    if(a[i]>b[i])
                    {
                        t=0;
                        break;
                    }
                    if(a[i]<b[i])
                    {
                        t=1;
                        break;
                    }
                }
            }
        }
        else
        {
            if(k>l)
                t=1;
            if(k<l)
                t=0;
            if(k==l)
            {
                for(i=0; i<l; i++)
                {
                    if(a[i]>b[i])
                    {
                        t=1;
                        break;
                    }
                    if(a[i]<b[i])
                    {
                        t=0;
                        break;
                    }
                }
            }
        }
        if(t==0)
            printf("a>b\n");
        if(t==1)
            printf("a<b\n");
        if(t==2)
            printf("a==b\n");
    }
}