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3083-表达式树
#include <bits/stdc++.h> std::string s, a, b; int k; void solve(char flag) { if (isalpha(flag)) return; char c = s[s.size() - ++k]; solve(c); b = c + b; solve(c); a = c + a; } signed main() { std::cin >> s;3083-表达式树
#include <bits/stdc++.h> std::string s, a, b; int k; void solve(char flag) { if (isalpha(flag)) return; char c = s[s.size() - ++k]; solve(c); b = c + b; solve(c); a = c + a; } signed main() { std::cin >> s;