day 5, part 1 (bad but working solution)

day05-easy/src/main.zig

@@ -21,8 +21,11 @@ fn StackList(comptime T: type, comptime capacity_type: type, comptime capacity:
             return false;
         }
 
-        fn getSlice(self: *const Self) []const T {
-            return self.mem[0..self.length];
+        fn getSlice(self: *Self) []T {
+            //var mem_full_slice = &self.mem;
+            //var mem_slice: []T = mem_full_slice[0..self.length];
+            //return mem_slice;
+            return (&self.mem)[0..self.length];
         }
 
         fn reset(self: *Self) void {
@@ -64,28 +67,34 @@ const State = struct {
     }
 
     fn addMapping(self: *State, destination_start: u64, source_start: u64, range_length: u64) void {
-        var current = self.getCurrent();
-        const previous = self.getPrevious().*;
         const source_end = source_start + range_length;
-        std.debug.print("processing mapping from {d}-{d} (length {d}) to {d}\n", .{ source_start, source_end, range_length, destination_start });
-        for (previous.getSlice()) |value| {
-            if (value >= source_start and value < source_end) {
-                const new_value = (value - source_start) + destination_start;
-                std.debug.print("adding new value {d}\n", .{new_value});
-                current.*.add(new_value);
+        //std.debug.print("processing mapping from {d}-{d} (length {d}) to {d}\n", .{ source_start, source_end, range_length, destination_start });
+        for (self.getPrevious().*.getSlice()) |*value| {
+            if (value.* >= source_start and value.* < source_end) {
+                const new_value = (value.* - source_start) + destination_start;
+                //std.debug.print("adding new value {d}\n", .{new_value});
+                self.add(new_value);
+                value.* = std.math.maxInt(u64);
             }
         }
     }
 
-    fn swap(self: *State) void {
+    fn finishMappings(self: *State) void {
+        //std.debug.print("previous values: {any}\n", .{self.getPrevious().*.getSlice()});
+        for (self.getPrevious().*.getSlice()) |value| {
+            if (value != std.math.maxInt(u64)) {
+                self.add(value);
+            }
+        }
+
         self.is_a_current = !self.is_a_current;
         self.getCurrent().*.reset();
     }
 
-    fn getMinCurrentValue(self: *State) u64 {
-        var current = self.getCurrent().*;
+    fn getMinPreviousValue(self: *State) u64 {
+        var previous = self.getPrevious().*;
         var result: u32 = std.math.maxInt(u32);
-        for (current.getSlice()) |value| {
+        for (previous.getSlice()) |value| {
             result = @min(result, value);
         }
 
@@ -93,7 +102,8 @@ const State = struct {
     }
 
     fn debug(self: *State) void {
-        std.debug.print("Current state: {any}, previous state: {any}\n", .{ self.getCurrent().*.getSlice(), self.getPrevious().*.getSlice() });
+        _ = self;
+        //std.debug.print("Current state: {any}, previous state: {any}\n", .{ self.getCurrent().*.getSlice(), self.getPrevious().*.getSlice() });
     }
 };
 
@@ -164,18 +174,19 @@ pub fn main() !void {
     state.debug();
     _ = try reader.readUntilDelimiterOrEof(&line_buffer, '\n');
     _ = try reader.readUntilDelimiterOrEof(&line_buffer, '\n');
-    state.swap();
+    state.finishMappings();
     state.debug();
     while (try reader.readUntilDelimiterOrEof(&line_buffer, '\n')) |line| {
         if (line.len != 0) {
             parseMappingLine(line, &state);
         } else {
-            state.debug();
             _ = try reader.readUntilDelimiterOrEof(&line_buffer, '\n');
-            state.swap();
+            state.finishMappings();
+            state.debug();
         }
     }
 
+    state.finishMappings();
     state.debug();
-    try stdout.print("{d}\n", .{state.getMinCurrentValue()});
+    try stdout.print("{d}\n", .{state.getMinPreviousValue()});
 }