Added day 4.

source/app.d

@@ -1,10 +1,7 @@
 import std.stdio;
 
-import day1.part1;
-import day1.part2;
-import day2.part1and2;
-import day3.part1;
+import day4.part1and2;
 
 void main() {
-	binaryDiagnostic2();
+	bingo();
 }

source/day4/input.txt

@@ -0,0 +1,601 @@
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source/day4/part1and2.d

@@ -0,0 +1,109 @@
+module day4.part1and2;
+
+import std.file;
+import std.stdio;
+import std.traits;
+import std.algorithm;
+import std.conv;
+import std.array;
+import std.string;
+import std.format;
+import std.range;
+
+struct BingoBoard {
+    uint[][] board = new uint[5][5];
+    bool[][] marks = new bool[5][5];
+
+    this(string s) {
+        auto rows = s.strip().split("\n");
+        foreach (i, row; rows) {
+            auto br = board[i];
+            formattedRead(row.strip(), "%d %d %d %d %d", br[0], br[1], br[2], br[3], br[4]);
+        }
+    }
+
+    void mark(uint value) {
+        foreach (r, row; board) {
+            foreach (c, col; row) {
+                if (col == value) marks[r][c] = true;
+            }
+        }
+    }
+
+    uint sumUnmarked() {
+        uint sum = 0;
+        foreach (r, row; board) {
+            foreach (c, col; row) {
+                if (!marks[r][c]) sum += col;
+            }
+        }
+        return sum;
+    }
+
+    bool isWinner() {
+        foreach (r; 0..5) {
+            bool rowMarked = true;
+            foreach (c; 0..5) {
+                if (!marks[r][c]) {
+                    rowMarked = false;
+                    break;
+                }
+            }
+            if (rowMarked) return true;
+        }
+        foreach (c; 0..5) {
+            bool colMarked = true;
+            foreach (r; 0..5) {
+                if (!marks[r][c]) {
+                    colMarked = false;
+                    break;
+                }
+            }
+            if (colMarked) return true;
+        }
+        return false;
+    }
+
+    public string toString() const {
+        string s = "";
+        foreach (r, row; board) {
+            foreach (c, col; row) {
+                s ~= format("%02d", col) ~ (marks[r][c] ? "*" : "-");
+                if (c < 4) s ~= " ";
+            }
+            s ~= "\n";
+        }
+        return s;
+    }
+}
+
+uint[] readSeparatedInts(S)(S str, string separator) if (isSomeString!S) {
+    return str.strip().split(separator).map!(s => to!uint(s)).array;
+}
+
+void bingo() {
+    auto f = File("source/day4/input.txt", "r");
+    uint[] chosenValues = readSeparatedInts(f.readln().strip(), ",");
+    string boardsText;
+    string line;
+    while ((line = f.readln()) !is null) {
+        boardsText ~= line;
+    }
+    BingoBoard[] boards = boardsText.split("\n\n")
+        .map!(t => BingoBoard(t))
+        .array;
+    uint[] winIndexes = [];
+    foreach (v; chosenValues) {
+        foreach (idx, b; boards) {
+            b.mark(v);
+            if (b.isWinner() && !winIndexes.canFind(idx)) {
+                winIndexes ~= cast(uint) idx;
+            }
+        }
+        if (boards.length == winIndexes.length) {
+            auto winningBoard = boards[winIndexes[winIndexes.length - 1]];
+            writefln("%d", winningBoard.sumUnmarked() * v);
+            return;
+        }
+    }
+}

source/day4/test_input.txt

@@ -0,0 +1,20 @@
+7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+
+22 13 17 11  0
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+
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+
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+ 2  0 12  3  7
+