求第五个点的数据，我把能想到的情况都想到了，还是90分

#include<bits/stdc++.h>
using namespace std;
int main(){
	string c;
	char s;
	int a,b,len=2,n,b0=0,d=1;
	cin>>n;
	for(int i=1;i<=n;i++){
		int x;
		cin>>c>>a;
		if(c[0]=='a'){
			s=c[0];
			cin>>b;
			x=a+b;
			cout<<a<<"+"<<b<<"="<<x<<endl;
		}else if(c[0]=='b'){
			s=c[0];
			cin>>b;
			x=a-b;
			cout<<a<<"-"<<b<<"="<<x<<endl;
			
		}else if(c[0]=='c'){
			s=c[0];
			cin>>b;
			x=a*b;
			cout<<a<<"*"<<b<<"="<<x<<endl;
		}else{
			int lens=c.length(),j=0;
			while(j<lens){
				for(int i=c.length()-1;i>j;i--) d*=10;
				b0=b0+(c[j]-'0')*d;
				d=1;
				j++;
			}
			b=b0;
			if(s=='a'){x=a+b;cout<<b<<"+"<<a<<"="<<x<<endl;}
			if(s=='b'){x=b-a;cout<<b<<"-"<<a<<"="<<x<<endl;}
			if(s=='c'){x=a*b;cout<<b<<"*"<<a<<"="<<x<<endl;}
		}
		if(x<0){len++;x=abs(x);}
		if(x==0){len++;}
		while(a!=0){len++;a/=10;}
		while(b!=0){len++;b/=10;}
		while(x!=0){len++;x/=10;}
		cout<<len<<endl;
		len=2;
		b0=0;
	}
	return 0;
}