6th day, 2nd challange done!!!!!

6th_day/2/main.cpp

@@ -0,0 +1,111 @@
+#include <fstream>
+#include <iostream>
+#include <string>
+#include <vector>
+
+using namespace std;
+
+vector<string> get_input(const string &FILE_NAME) {
+  ifstream file(FILE_NAME);
+
+  vector<string> result;
+  string s;
+  int longest = 0;
+  int last_lenght = 0;
+
+  while (getline(file, s)) {
+    longest = s.length() > longest ? s.length() : longest;
+    last_lenght = s.length();
+    result.push_back(s);
+  }
+  return result;
+}
+
+int count_rows(const vector<string> &input) {
+  int count = 0;
+  for (string row : input) {
+    count++;
+  }
+
+  return count;
+}
+
+vector<vector<string>> process_input(const vector<string> &input) {
+  string new_column = "";
+  vector<vector<string>> result;
+  vector<string> group;
+  char expresion = ' ';
+
+  // for every row from behind
+  for (int i = input[0].length() - 1; i >= 0; i--) {
+
+    // for every column
+    for (int j = 0; j < count_rows(input); j++) {
+
+      char symbol = input[j][i];
+      if (symbol == ' ') {
+        continue;
+      }
+
+      if (symbol != '+' && symbol != '*') {
+        new_column += symbol;
+      } else {
+        expresion = symbol;
+      }
+    }
+    if (new_column != "") {
+      group.push_back(new_column);
+      new_column = "";
+    }
+
+    if (expresion != ' ') {
+      group.push_back(string(1, expresion));
+      result.push_back(group);
+      expresion = ' ';
+      group.clear();
+    }
+  }
+  return result;
+}
+
+long long process_operation(vector<string> &input) {
+  char operation = input.back()[0];
+  input.pop_back();
+  long long sum;
+  switch (operation) {
+  case '+':
+    sum = 0;
+    cout << "Now we are adding numbers: ";
+    for (string value : input) {
+      cout << value << " ";
+      sum += stoll(value);
+    }
+    cout << endl;
+    break;
+  case '*':
+    sum = 1;
+    cout << "Now we are multiplying numbers: ";
+    for (string value : input) {
+      cout << value << " ";
+      sum *= stoll(value);
+    }
+    cout << endl;
+    break;
+  }
+  cout << "The sum is " << sum << endl;
+  return sum;
+}
+
+int main() {
+  const string FILE_NAME = "input.txt";
+  vector<string> input = get_input(FILE_NAME);
+  vector<vector<string>> processed_input = process_input(input);
+
+  long long sum = 0;
+
+  for (auto &row : processed_input) {
+    sum += process_operation(row);
+  }
+  cout << "Sum: " << sum << endl;
+  return 0;
+}