From 0ada48f859ab59acdbd67e67e887026cacc29e33 Mon Sep 17 00:00:00 2001
From: Stoycho Kyosev <stoycho.kk@gmail.com>
Date: Wed, 9 Nov 2022 22:56:24 +0200
Subject: add Seminar06

---
 Seminar06/task02.cpp | 110 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 Seminar06/task02.cpp

(limited to 'Seminar06/task02.cpp')

diff --git a/Seminar06/task02.cpp b/Seminar06/task02.cpp
new file mode 100644
index 0000000..5f8bf92
--- /dev/null
+++ b/Seminar06/task02.cpp
@@ -0,0 +1,110 @@
+#include<list>
+#include<iostream>
+#include<queue>
+#include<stack>
+
+bool isSymethric(const std::list<int>& ll) {
+    auto start = ll.begin();
+    auto end = --(ll.end());
+
+    while(start != end) {
+        if(*start != *end)
+            return false;
+        
+        ++start;
+        if(start == end)
+            break;
+        --end;
+    }
+
+    return true;
+}
+
+int evaluateExpr(char op, int fst, int snd) {
+    // assert(isOperator(op));
+    
+    switch (op) {
+        case '+':
+            return (fst + snd);
+        break;
+         case '-':
+            return (fst - snd);
+        break;
+         case '*':
+            return (fst * snd);
+        break;
+         case '/':
+            return (snd / fst);
+        break;
+    }
+}
+
+size_t evaluateQueue(std::queue<char> q) {
+    std::stack<int> nums;
+
+    while(!q.empty()) {
+        if(isdigit(q.front())) {
+            int cDigit = q.front() - '0';
+            q.pop();
+            nums.push(cDigit);
+        }
+        else {
+            int fst = nums.top();
+            nums.pop();
+            int snd = nums.top();
+            nums.pop();
+            char op = q.front();
+            q.pop();
+
+            nums.push(evaluateExpr(op, fst, snd));
+        }
+    }
+    return nums.top();
+}
+
+bool solution(const std::list<std::queue<char>>& ll) {
+    std::list<int> l;
+
+    for(auto elem : ll)
+        l.push_back(evaluateQueue(elem));
+    
+    return isSymethric(l);
+}
+
+int main() {
+    std::list<std::queue<char>> test(5);
+
+    auto it = test.begin();
+    (*it).push('4');
+    (*it).push('5');
+    (*it).push('+');
+
+    ++it;
+
+    (*it).push('1');
+    (*it).push('6');
+    (*it).push('+');
+    (*it).push('7');
+    (*it).push('*');
+    ++it;
+
+    (*it).push('8');
+    ++it;
+
+    (*it).push('1');
+    (*it).push('7');
+    (*it).push('7');
+    (*it).push('*');
+    (*it).push('*');
+
+    ++it;
+
+    (*it).push('2');
+    (*it).push('3');
+    (*it).push('*');
+    (*it).push('3');
+    (*it).push('+');
+
+
+    std::cout << solution(test);
+}
\ No newline at end of file
-- 
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