具体描述忘了，大概是火星有两种运算符，#和$。
其中，
x#y = 2 * x + 3 * y + 4;
x$y = 3 * x + y + 2;
$优先级高于#
输入：1#2$3$4$5#8#9，
输出：1599
代码实现：
#include <cstdio>
#include <iostream>
#include <stack>using namespace std;// #
int xay(int x, int y) {return 2 * x + 3 * y + 4;
}// $
int xby(int x, int y) {return 3 * x + y + 2;
}int main()
{string s;cin >> s;stack<int> ds;string num;int first = -1;int second = -1;for (int i = 0; i < s.size(); i++) {if (s[i] >= '0' && s[i] <= '9') {num.push_back(s[i]);}else {if (!num.empty()) {ds.push(atoi(num.c_str()));num.erase(num.begin(), num.end());}if (first >= 0) {second = ds.top();ds.pop();ds.push(xby(first, second));first = -1;}if (s[i] == '$') {if (first < 0) {first = ds.top();ds.pop();}}}}if (!num.empty()) {ds.push(atoi(num.c_str()));if (first >= 0) {second = ds.top();ds.pop();ds.push(xby(first, second));first = -1;}}stack<int> dst;while (!ds.empty()) {dst.push(ds.top());ds.pop();}int t = -1;while (!dst.empty()) {if (t < 0) {t = dst.top();}else {t = xay(t, dst.top());}dst.pop();}cout << t;return 0;
}