Added older advents

advent_of_code_2018/day11/main.cc

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+#include <iomanip>
+#include <iostream>
+#include <string>
+#include <vector>
+
+using namespace std;
+
+int evaluate_square(vector<vector<int>> const &grid, size_t topx, size_t lefty, size_t size = 3)
+{
+    int sum = 0;
+
+    for (size_t idx = 0; idx != size; ++idx)
+    {
+        for (size_t idy = 0; idy != size; ++idy)
+            sum += grid[topx + idx][lefty + idy];
+    }
+
+    return sum;
+}
+
+int main()
+{
+    size_t grid_width;
+    size_t grid_height;
+    int grid_serial_number;
+    
+    cin >> grid_serial_number;
+    cin >> grid_width;
+    cin >> grid_height;
+
+    vector<vector<int>> grid;
+    grid.resize(grid_width, vector<int>(grid_height, 0));
+
+    for (size_t idy = 0; idy < grid_height; ++idy)
+    {
+        for (size_t idx = 0; idx < grid_width; ++idx)
+        {
+            int rack_id = idx + 11;
+            int powerlevel = rack_id * (idy + 1);
+            
+            powerlevel += grid_serial_number;
+            powerlevel *= rack_id;
+            
+            string text = to_string(powerlevel);
+            powerlevel = text.size() >= 3 ? (text[text.size() - 3] - '0') : 0;
+            powerlevel -= 5;
+            
+            grid[idx][idy] = powerlevel;
+            // cout << setw(4) << powerlevel;
+        }
+        // cout << "\n";
+    }
+
+    int top_value = numeric_limits<int>::min();
+    size_t top_size;
+    size_t top_x;
+    size_t top_y;
+    for (size_t size = 0; size != 300; ++size)
+    {
+        cout << "Size " << setw(3) << size << "/300\r" << flush;
+        for (size_t idx = 1; idx != (grid_width - (size - 1)); ++idx)
+        {
+            for (size_t idy = 0; idy != (grid_width - (size - 1)); ++idy)
+            {
+                int value = evaluate_square(grid, idx, idy, size);
+                if (value > top_value)
+                {
+                    top_value = value;
+                    top_size = size;
+                    top_x = idx + 1;
+                    top_y = idy + 1;
+                }
+            }
+        }
+    }
+
+    cout << "Top x,y,size is " << top_x << "," << top_y << "," << top_size
+        << " with " << top_value << " power\n";
+
+}