Add day 17

Day15/Day15.py

@@ -14,7 +14,7 @@ class Elf:
         self.targeted = False
 
     def __repr__(self):
-        return "E"
+        return "\033[32mE\033[0m"
 
 
 class Goblin:
@@ -28,7 +28,7 @@ class Goblin:
         self.targeted = False
 
     def __repr__(self):
-        return "G"
+        return "\033[31mG\033[0m"
 
 
 Elf.enemy = Goblin
@@ -41,7 +41,7 @@ class Wall:
         self.targeted = False
 
     def __repr__(self):
-        return "#"
+        return "\u2588"
 
 
 class Empty:
@@ -51,7 +51,7 @@ class Empty:
         self.targeted = False
 
     def __repr__(self):
-        return "." if not self.targeted else "\033[33m?\033[0m"
+        return " " if not self.targeted else "\033[33m?\033[0m"
 
 
 NEIGHBORS = [(0, -1), (-1, 0), (1, 0), (0, 1)]
@@ -121,10 +121,6 @@ def find_closest(field, pos, targets):
 
 
 def move(field, x, y, value):
-    for row in field:
-        for col in row:
-            col.targeted = False
-
     targets = []
     for tx, ty in value.enemy.locations:
         targets.extend([(tx + dx, ty + dy) for dx, dy in NEIGHBORS])
@@ -132,9 +128,6 @@ def move(field, x, y, value):
     if not targets:
         raise StopIteration
 
-    for tx, ty in targets:
-        field[ty][tx].targeted = True
-
     closest = find_closest(field, (x, y), targets)
     # print_field(field, highlight=(x, y), path=closest)
     # time.sleep(0.3)
@@ -176,8 +169,9 @@ def attack(field, x, y, value):
 
 
 def print_field(field, steps=None, highlight=None, path=None):
-    if steps is not None:
-        print(f"round={steps}")
+    print("\033[2J\033[;HElf attack power:", Elf.power)
+    # if steps is not None:
+    #     print(f"round={steps}")
     for y, row in enumerate(field):
         units = []
         for x, value in enumerate(row):
@@ -194,10 +188,11 @@ def print_field(field, steps=None, highlight=None, path=None):
         etc = sorted(units, key=lambda unit: (str(unit), unit.health))
         print(" ", ", ".join(f"{x}({x.health})" for x in etc))
     print()
+    time.sleep(0.05)
 
 
 def step(field, steps):
-    # print_field(field, steps)
+    print_field(field, steps)
     seen_units = set()
     for y, row in enumerate(field):
         for x, value in enumerate(row):
@@ -235,8 +230,9 @@ def main():
 while True:
     main()
     if Elf.deaths == 0:
-        print("yay")
+        print("No elves died! :D")
         break
 
     Elf.power += 1
-    print("oh no :(, trying", Elf.power)
+    print(f"{Elf.deaths} elves died, trying power={Elf.power}")
+    time.sleep(4)

Day16/Day16B.c

@@ -16,44 +16,32 @@ typedef struct {
 } Sample;
 
 enum {
-    ADDR, ADDI, MULR, MULI,
-    BANR, BANI, BORR, BORI,
-    SETR, SETI, GTIR, GTRI,
-    GTRR, EQIR, EQRI, EQRR,
+    ADDR, ADDI, MULR, MULI, BANR, BANI, BORR, BORI,
+    SETR, SETI, GTIR, GTRI, GTRR, EQIR, EQRI, EQRR,
 };
 
+#ifdef DEBUG
 const char *names[] = {
-    "addr", "addi", "mulr", "muli",
-    "banr", "bani", "borr", "bori",
-    "setr", "seti", "gtir", "gtri",
-    "gtrr", "eqir", "eqri", "eqrr",
-};
-
-uint16_t table[16] = {
-    0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
-    0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
-    0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
-    0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
+    "addr", "addi", "mulr", "muli", "banr", "bani", "borr", "bori",
+    "setr", "seti", "gtir", "gtri", "gtrr", "eqir", "eqri", "eqrr",
 };
+#endif
 
 int opcodes[16];
 
 int sample_read(Sample *s, FILE *file) {
     int read = 0;
 
-    read =
-        fscanf(file, "Before: [%u, %u, %u, %u]\n",
-               &s->before[0], &s->before[1], &s->before[2], &s->before[3]);
+    read = fscanf(file, "Before: [%u, %u, %u, %u]\n",
+                  &s->before[0], &s->before[1], &s->before[2], &s->before[3]);
     if (read != 4) return 0;
 
     Instruction *i = &s->instruction;
-    read = fscanf(file, "%" SCNu8 " %u %u %u\n",
-                   &i->opcode, &i->a, &i->b, &i->c);
+    read = fscanf(file, "%" SCNu8 " %u %u %u\n", &i->opcode, &i->a, &i->b, &i->c);
     if (read != 4) return 0;
 
-    read =
-        fscanf(file, "After: [%u, %u, %u, %u]\n\n",
-               &s->after[0], &s->after[1], &s->after[2], &s->after[3]);
+    read = fscanf(file, "After: [%u, %u, %u, %u]\n\n",
+                  &s->after[0], &s->after[1], &s->after[2], &s->after[3]);
     if (read != 4) return 0;
 
     return 1;
@@ -63,25 +51,32 @@ uint16_t sample_possible_opcodes(const Sample s) {
     uint16_t possible_opcodes = 0;
 
     Instruction i = s.instruction;
+
     // Addition
     if (s.after[i.c] == s.before[i.a] + s.before[i.b])    possible_opcodes |= 1 << ADDR;
     if (s.after[i.c] == s.before[i.a] + i.b)              possible_opcodes |= 1 << ADDI;
+
     // Multiplication
     if (s.after[i.c] == s.before[i.a] * s.before[i.b])    possible_opcodes |= 1 << MULR;
     if (s.after[i.c] == s.before[i.a] * i.b)              possible_opcodes |= 1 << MULI;
+
     // Bitwise AND
     if (s.after[i.c] == (s.before[i.a] & s.before[i.b]))  possible_opcodes |= 1 << BANR;
     if (s.after[i.c] == (s.before[i.a] & i.b))            possible_opcodes |= 1 << BANI;
+
     // Bitwise OR
     if (s.after[i.c] == (s.before[i.a] | s.before[i.b]))  possible_opcodes |= 1 << BORR;
     if (s.after[i.c] == (s.before[i.a] | i.b))            possible_opcodes |= 1 << BORI;
+
     // Assignment
     if (s.after[i.c] == s.before[i.a])                    possible_opcodes |= 1 << SETR;
     if (s.after[i.c] == i.a)                              possible_opcodes |= 1 << SETI;
+
     // Greater-than testing
     if (s.after[i.c] == (i.a > s.before[i.b]))            possible_opcodes |= 1 << GTIR;
     if (s.after[i.c] == (s.before[i.a] > i.b))            possible_opcodes |= 1 << GTRI;
     if (s.after[i.c] == (s.before[i.a] > s.before[i.b]))  possible_opcodes |= 1 << GTRR;
+
     // Equality testing
     if (s.after[i.c] == (i.a == s.before[i.b]))           possible_opcodes |= 1 << EQIR;
     if (s.after[i.c] == (s.before[i.a] == i.b))           possible_opcodes |= 1 << EQRI;
@@ -101,8 +96,19 @@ int bits_set(uint16_t n) {
     return bit;
 }
 
-void find_opcodes() {
+void find_opcodes(FILE *file) {
     int unknown = 16;
+    uint16_t table[16] = {
+        0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
+        0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
+    };
+
+    Sample sample;
+    while (sample_read(&sample, file)) {
+        uint16_t possible_opcodes = sample_possible_opcodes(sample);
+        table[sample.instruction.opcode] &= possible_opcodes;
+    }
+
     while (unknown > 0) {
         for (int opcode = 0; opcode < 16; opcode++) {
             int bit = bits_set(table[opcode]);
@@ -117,9 +123,10 @@ void find_opcodes() {
         }
     }
 
-    for (int i = 0; i < 16; i++) {
+#ifdef DEBUG
+    for (int i = 0; i < 16; i++)
         printf("%d: %s\n", i, names[opcodes[i]]);
-    }
+#endif
 }
 
 int instruction_read(Instruction *i, FILE *file) {
@@ -170,25 +177,27 @@ int main(int argc, char **argv) {
     }
 
     FILE *file = fopen(argv[1], "r");
-    Sample sample = {0};
-
-    while (sample_read(&sample, file)) {
-        uint16_t possible_opcodes = sample_possible_opcodes(sample);
-        table[sample.instruction.opcode] &= possible_opcodes;
-    }
-    find_opcodes();
+    find_opcodes(file);
 
     uint32_t registers[4] = {0};
     Instruction instruction = {0};
     while (instruction_read(&instruction, file)) {
+#ifdef DEBUG
         const char *name = names[opcodes[instruction.opcode]];
         printf("opcode: %2d (%s), a: %d, b: %d, c: %d\n", instruction.opcode,
                name, instruction.a, instruction.b, instruction.c);
+#endif
+
         instruction_execute(&instruction, registers);
+
+#ifdef DEBUG
         printf("registers: %d %d %d %d\n", registers[0], registers[1],
                registers[2], registers[3]);
+#endif
     }
 
     fclose(file);
+
+    printf("%d\n", registers[0]);
     return EXIT_SUCCESS;
 }

Day17/Day17A.c

@@ -0,0 +1,197 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <assert.h>
+#include <string.h>
+
+#define AT(x, y) grid[(y) * x_max + (x)]
+
+void get_limits(FILE *file, int *x_min, int *x_max, int *y_min, int *y_max) {
+    char *line = NULL;
+    size_t len;
+
+    *x_min = INT_MAX;
+    *x_max = INT_MAX;
+    *x_max = 0;
+    *y_max = 0;
+
+    while (getline(&line, &len, file) != -1) {
+        int xa, xb, ya, yb;
+        if (sscanf(line, "x=%d, y=%d..%d", &xa, &ya, &yb) == 3) {
+            if (xa < *x_min) *x_min = xa;
+            if (xa + 1 > *x_max) *x_max = xa + 1;
+            if (ya < *y_min) *y_min = ya;
+            if (yb + 1 > *y_max) *y_max = yb + 1;
+        } else if (sscanf(line, "y=%d, x=%d..%d", &ya, &xa, &xb) == 3) {
+            if (xa < *x_min) *x_min = xa;
+            if (xb + 1 > *x_max) *x_max = xa + 1;
+            if (ya < *y_min) *y_min = ya;
+            if (ya + 1 > *y_max) *y_max = yb + 1;
+        } else {
+            break;
+        }
+    }
+
+    *x_max += 10;
+        *x_min -= 10;
+    printf("grid: x=%d..%d y=%d..%d\n", *x_min, *x_max, *y_min, *y_max);
+
+    rewind(file);
+}
+
+void build_grid(FILE *file, char *grid, int x_max) {
+    char *line = NULL;
+    size_t len;
+    while (getline(&line, &len, file) != -1) {
+        int xa, xb, ya, yb;
+        if (sscanf(line, "x=%d, y=%d..%d", &xa, &ya, &yb) == 3) {
+            printf("x=%d, y=%d..%d\n", xa, ya, yb);
+            for (int y = ya; y <= yb; y++)
+                AT(xa, y) = '#';
+        } else if (sscanf(line, "y=%d, x=%d..%d", &ya, &xa, &xb) == 3) {
+            printf("x=%d..%d, y=%d\n", xa, xb, ya);
+            for (int x = xa; x <= xb; x++)
+                AT(x, ya) = '#';
+        } else {
+            break;
+        }
+    }
+    grid[500] = '+';
+}
+
+void print_grid(char *grid, int x_min, int x_max, int y_min, int y_max) {
+    printf("\n");
+    printf("      "); for (int x = x_min; x < x_max; x++) printf("%d", x / 100 % 10);  printf("\n");
+    printf("      "); for (int x = x_min; x < x_max; x++) printf("%d", x / 10 % 10);   printf("\n");
+    printf("      "); for (int x = x_min; x < x_max; x++) printf("%d", x % 10);        printf("\n");
+
+    for (int y = 0; y < y_max + 3; y++) {
+        if (y < y_min || y >= y_max)
+            printf("\033[41m");
+        printf("%4d  \033[0m", y);
+        for (int x = x_min; x < x_max; x++) {
+            switch (grid[y * x_max + x]) {
+            case '.':
+                putchar(' ');
+                putchar(' ');
+                break;
+
+            case '|':
+                printf("\033[44m\u2551\u2551\033[0m");
+                break;
+
+            case '~':
+                printf("\033[44m\u2248\u2248\033[0m");
+                break;
+
+            case '#':
+                printf("\033[33m\u2588\u2588\033[0m");
+                break;
+
+            case '+':
+                printf("\033[41m\u256C\u256C\033[0m");
+                break;
+
+            default:
+                assert(0);
+            }
+        }
+        putchar('\n');
+    }
+}
+
+char *read_grid(FILE *file, int *x_min, int *x_max, int *y_min, int *y_max) {
+    get_limits(file, x_min, x_max, y_min, y_max);
+
+    size_t size = (*y_max + 50) * *x_max;
+    char *grid = malloc(size);
+    memset(grid, '.', size);
+
+    build_grid(file, grid, *x_max);
+    return grid;
+}
+
+
+void step(char *grid, int x_min, int x_max, int y_min, int y_max) {
+    for (int y = 0; y < y_max + 50; y++) {
+        for (int x = x_min; x < x_max; x++) {
+            if (AT(x, y) == '+' || AT(x, y) == '|') {
+                if (AT(x, y + 1) == '.') {
+                    AT(x, y + 1) = '|';
+                } else if (AT(x, y + 1) == '#' || AT(x, y + 1) == '~') {
+                    int is_still = 1;
+                    int left_wall = -1, right_wall = -1;
+
+                    for (int x_ = x; x_ >= x_min - 1; x_--) {
+                        if (AT(x_, y) == '#') {
+                            left_wall = x_ + 1;
+                            break;
+                        } else if (AT(x_, y + 1) == '.' || AT(x_, y + 1) == '|') {
+                            is_still = 0;
+                            left_wall = x_;
+                            break;
+                        }
+                    }
+
+                    for (int x_ = x; x_ <= x_max; x_++) {
+                        if (AT(x_, y) == '#') {
+                            right_wall = x_ - 1;
+                            break;
+                        } else if (AT(x_, y + 1) == '.' || AT(x_, y + 1) == '|') {
+                            is_still = 0;
+                            right_wall = x_;
+                            break;
+                        }
+                    }
+
+                    if (left_wall != -1 && right_wall != -1) {
+                        for (int x_ = left_wall; x_ <= right_wall; x_++) {
+                            assert(AT(x_, y) != '#');
+                            AT(x_, y) = is_still ? '~' : '|';
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+int count_water(char *grid, int x_min, int x_max, int y_min, int y_max) {
+    int water = 0;
+    for (int y = y_min; y < y_max; y++) {
+        for (int x = x_min; x < x_max; x++) {
+            water += (AT(x, y) == '~') ? 1 : 0;
+        }
+    }
+    return water;
+}
+
+int main(int argc, char **argv) {
+    if (argc != 2) {
+        printf("Usage: %s [input]\n", argv[0]);
+        return EXIT_FAILURE;
+    }
+    FILE *file = fopen(argv[1], "r");
+
+    int x_min, x_max, y_min, y_max;
+    char *grid = read_grid(file, &x_min, &x_max, &y_min, &y_max);
+
+    print_grid(grid, x_min, x_max, y_min, y_max);
+    int last_water = -1, water = -1;
+    int extra_steps = 0;
+    do {
+        step(grid, x_min, x_max, y_min, y_max);
+
+        last_water = water;
+        water = count_water(grid, x_min, x_max, y_min, y_max);
+        printf("Water: %d\r", water);
+
+        if (last_water == water)
+            extra_steps += 1;
+        else
+            extra_steps = 0;
+    } while (extra_steps < 200);
+
+    print_grid(grid, x_min, x_max, y_min, y_max);
+    printf("Water: %d\n", water);
+}