把x-y换成y-x即可
by ZZX_6666 @ 2023-08-11 15:12:15
@[zym0325](/user/804115)
by ZZX_6666 @ 2023-08-11 15:12:37
```cpp
#include <bits/stdc++.h>
using namespace std;
stack <int> s;
int cnt;
char c;
int main() {
while((c = getchar()) != '@') {
if(c >= '0' && c <= '9') cnt = cnt * 10 + c - '0';
else if(c == '.') s.push(cnt), cnt = 0;
else {
int x = s.top(); s.pop();
int y = s.top(); s.pop();
switch(c) {
case '+': s.push(x + y); break;
case '-': s.push(y - x); break;
case '*': s.push(x * y); break;
case '/': s.push(y / x); break;
}
}
}
cout << s.top();
return 0;
}
```
@[zym0325](/user/804115)
by jasonshen_ @ 2023-08-11 15:27:32
@[ZZX_6666](/user/779786) thx
by zym0325 @ 2023-08-11 15:52:43