From 8f2c0f8c2dd22cee413861b0827698deffd2ab58 Mon Sep 17 00:00:00 2001
From: Bruno Raoult <braoult@gmail.com>
Date: Sat, 4 Dec 2021 16:14:12 +0100
Subject: [PATCH] day 4 init

---
 2021/day04/EXAMPLE.txt |  19 ++
 2021/day04/INPUT.txt   | 601 +++++++++++++++++++++++++++++++++++++++++
 2021/day04/Makefile    |  56 ++++
 2021/day04/README.txt  |  59 ++++
 4 files changed, 735 insertions(+)
 create mode 100644 2021/day04/EXAMPLE.txt
 create mode 100644 2021/day04/INPUT.txt
 create mode 100644 2021/day04/Makefile
 create mode 100644 2021/day04/README.txt

diff --git a/2021/day04/EXAMPLE.txt b/2021/day04/EXAMPLE.txt
new file mode 100644
index 0000000..669a51d
--- /dev/null
+++ b/2021/day04/EXAMPLE.txt
@@ -0,0 +1,19 @@
+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
+ 8  2 23  4 24
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+ 1 12 20 15 19
+
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+14 21 16 12  6
+
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+22 11 13  6  5
+ 2  0 12  3  7
diff --git a/2021/day04/INPUT.txt b/2021/day04/INPUT.txt
new file mode 100644
index 0000000..6f02da3
--- /dev/null
+++ b/2021/day04/INPUT.txt
@@ -0,0 +1,601 @@
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+
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diff --git a/2021/day04/Makefile b/2021/day04/Makefile
new file mode 100644
index 0000000..88f5c4e
--- /dev/null
+++ b/2021/day04/Makefile
@@ -0,0 +1,56 @@
+# AOC daily Makefile - GNU make only.
+#
+# Copyright (C) 2021 Bruno Raoult ("br")
+# Licensed under the GNU General Public License v3.0 or later.
+# Some rights reserved. See COPYING.
+#  * You should have received a copy of the GNU General Public License along with this
+# program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.htmlL>.
+#
+# SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+#
+
+INPUT   := INPUT.txt
+SHELL   := /bin/bash
+
+CC      := gcc
+
+LIB     := aoc_$(shell uname -m)
+INCDIR  := ../include
+LIBDIR  := ../lib
+LDFLAGS := -L$(LIBDIR)
+LDLIB   := -l$(LIB)
+
+export LD_LIBRARY_PATH = $(LIBDIR)
+
+CFLAGS += -std=gnu99
+CFLAGS += -O2
+CFLAGS += -g
+CFLAGS += -Wall
+CFLAGS += -Wextra
+CFLAGS += -march=native
+CFLAGS += -Wmissing-declarations
+CFLAGS += -Wno-unused-result
+
+CFLAGS += -DDEBUG_POOL              # memory pools management
+
+TIME   := \time -f "\ttime: %E real, %U user, %S sys\n\tcontext-switch:\t%c+%w, page-faults: %F+%R\n"
+export PATH := .:$(PATH)
+
+.PHONY: clean all compile deploy ex1 ex2
+
+all: ex1 ex2
+
+compile: aoc-c
+
+ex1: aoc-c
+	@$(TIME) aoc-c -d 5 -p 1 < $(INPUT)
+
+ex2: aoc-c
+	@$(TIME) aoc-c -d 5 -p 2 < $(INPUT)
+
+clean:
+	@rm -f aoc-c core*
+
+.c:
+	@echo compiling $<
+	@$(CC) $(CFLAGS) $(LDFLAGS) -I $(INCDIR) $< $(LDLIB) -o $@
diff --git a/2021/day04/README.txt b/2021/day04/README.txt
new file mode 100644
index 0000000..ca7754c
--- /dev/null
+++ b/2021/day04/README.txt
@@ -0,0 +1,59 @@
+--- Day 4: Giant Squid ---
+
+You're already almost 1.5km (almost a mile) below the surface of the ocean, already so deep that you can't see any sunlight. What you can see, however, is a giant squid that has attached itself to the outside of your submarine.
+
+Maybe it wants to play bingo?
+
+Bingo is played on a set of boards each consisting of a 5x5 grid of numbers. Numbers are chosen at random, and the chosen number is marked on all boards on which it appears. (Numbers may not appear on all boards.) If all numbers in any row or any column of a board are marked, that board wins. (Diagonals don't count.)
+
+The submarine has a bingo subsystem to help passengers (currently, you and the giant squid) pass the time. It automatically generates a random order in which to draw numbers and a random set of boards (your puzzle input). For example:
+
+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
+ 8  2 23  4 24
+21  9 14 16  7
+ 6 10  3 18  5
+ 1 12 20 15 19
+
+ 3 15  0  2 22
+ 9 18 13 17  5
+19  8  7 25 23
+20 11 10 24  4
+14 21 16 12  6
+
+14 21 17 24  4
+10 16 15  9 19
+18  8 23 26 20
+22 11 13  6  5
+ 2  0 12  3  7
+
+After the first five numbers are drawn (7, 4, 9, 5, and 11), there are no winners, but the boards are marked as follows (shown here adjacent to each other to save space):
+
+22 13 17 11  0         3 15  0  2 22        14 21 17 24  4
+ 8  2 23  4 24         9 18 13 17  5        10 16 15  9 19
+21  9 14 16  7        19  8  7 25 23        18  8 23 26 20
+ 6 10  3 18  5        20 11 10 24  4        22 11 13  6  5
+ 1 12 20 15 19        14 21 16 12  6         2  0 12  3  7
+
+After the next six numbers are drawn (17, 23, 2, 0, 14, and 21), there are still no winners:
+
+22 13 17 11  0         3 15  0  2 22        14 21 17 24  4
+ 8  2 23  4 24         9 18 13 17  5        10 16 15  9 19
+21  9 14 16  7        19  8  7 25 23        18  8 23 26 20
+ 6 10  3 18  5        20 11 10 24  4        22 11 13  6  5
+ 1 12 20 15 19        14 21 16 12  6         2  0 12  3  7
+
+Finally, 24 is drawn:
+
+22 13 17 11  0         3 15  0  2 22        14 21 17 24  4
+ 8  2 23  4 24         9 18 13 17  5        10 16 15  9 19
+21  9 14 16  7        19  8  7 25 23        18  8 23 26 20
+ 6 10  3 18  5        20 11 10 24  4        22 11 13  6  5
+ 1 12 20 15 19        14 21 16 12  6         2  0 12  3  7
+
+At this point, the third board wins because it has at least one complete row or column of marked numbers (in this case, the entire top row is marked: 14 21 17 24 4).
+
+The score of the winning board can now be calculated. Start by finding the sum of all unmarked numbers on that board; in this case, the sum is 188. Then, multiply that sum by the number that was just called when the board won, 24, to get the final score, 188 * 24 = 4512.
+
+To guarantee victory against the giant squid, figure out which board will win first. What will your final score be if you choose that board?