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  1. #include<bits/stdc++.h>
  2. #define int long long
  3. using namespace std;
  4. int solve(string s) {
  5.     stack<int> st;
  6.     int num = 0;
  7.     char ops = '+';
  8.     for(int i = 0; i < s.size(); i ++) {
  9.         char c = s[i];
  10.         if (isdigit(c)) num = num * 10 + (c - '0');
  11.         if ((!isdigit(c) and c != ' ') or i == s.size() - 1){
  12.             if (ops == '+') st.push(num);
  13.             else if (ops == '-') st.push(-num);
  14.             else if (ops == '*') {
  15.                 int top = st.top();
  16.                 st.pop();
  17.                 st.push(top * num);
  18.             }
  19.             else if (ops == '/') {
  20.                 int top = st.top();
  21.                 st.pop();
  22.                 st.push(top / num);
  23.             }
  24.             ops = c;
  25.             num = 0;
  26.         }
  27.     }
  28.     int ans = 0;
  29.     while (!st.empty()) {
  30.         ans += st.top();
  31.         st.pop();
  32.     }
  33.     return ans;
  34. }
  35.  
  36. signed main() {
  37.     string s;
  38.     getline(cin, s);
  39.     cout << solve(s);
  40.     return 0;
  41. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/yd6TM7
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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