implement mining functionality in SortBot and add .gitignore

.idea/.gitignore

@@ -0,0 +1,10 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Ignored default folder with query files
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

include/SortBot.h

@@ -7,3 +7,4 @@ class SortBot : public BaseRobot {
     SortBot ( int startX, int startY );
     int mine ( World &world ) override;
 };
+

src/SortBot.cpp

@@ -4,4 +4,29 @@
 #include <algorithm>
 #include <vector>
 
-SortBot::SortBot ( int startX, int startY ) : BaseRobot ( "SortBot", startX, startY ) {}
+SortBot::SortBot ( const int startX, const int startY ) : BaseRobot ( "SortBot", startX, startY ) {}
+
+int SortBot::mine ( World &world ) {
+    // create ( value, z ) pairs for positive values ( exclude mined blocks and effects )
+    std::vector<std::pair<int, int>> values;
+    for ( int z = 0; z < world.getSizeZ(); ++z ) {
+        int v = world.getValue(x_, y_, z );
+        if ( v > 0 ) values.emplace_back(v, z );
+    }
+    if ( values.empty()) return 0;
+    // sort descending
+    std::sort ( values.begin(), values.end(), [] ( const auto& a, const auto& b ) { return a.first > b.first;} );
+
+for ( auto& [x,  z] : values ) {
+    world.setValue ( x_, y_, z, 0);
+}
+    for ( std::size_t i = 0; i < values.size(); ++i ) {
+        world.setValue( x_, y_, static_cast<int>(i), values[i].first );
+    }
+    int surface = world.getSurfaceLevel(x_, y_);
+    if ( surface < 0 ) return 0;
+    int mined = world.getValue ( x_, y_, surface );
+    world.setValue ( x_, y_, surface, 0 );
+    score_ += mined;
+    return mined;
+}