‮[@Lv1000](/space/show?uid=93249)
by 夏义博 @ 2018-10-31 19:59:57
^ _ ^
by 夏义博 @ 2018-10-31 20:00:21
@[Lv1000](/space/show?uid=116532)
```
#include<bits/stdc++.h>
using namespace std;
string s;
double lt,rt;
int u[3],n[3],k,t=0,alp;
void cal(bool kind)
{
int tmp=0;
bool flag=0;
while('0'<=s[k]&&s[k]<='9'){
flag=1;
tmp=tmp*10+s[k]-'0';
k++;
}
if(!flag)tmp=1;
if(kind)tmp=-tmp;
if('a'<=s[k]&&s[k]<='z'){
u[t]+=tmp;
alp=k;
k++;
}
else n[t]+=tmp;
}
int main()
{
cin>>s;
for(k=0;k<s.length();){
if(s[k]=='='){
t=1;
k++;
continue;
}
if(s[k]=='-'){
k++;
cal(1);
}
else{
if(s[k]=='+')k++;
cal(0);
}
}
lt=n[0]-n[1];
rt=u[1]-u[0];
printf("%c=%.3lf\n",s[alp],lt/rt);
return 0;
}
```
by 夏义博 @ 2018-10-31 20:39:02
47不到的代码。
by 夏义博 @ 2018-10-31 20:39:24