1 files changed, 68 insertions, 0 deletions
diff --git a/03/part2.c b/03/part2.c
new file mode 100644
index 0000000..bd4bacd
--- /dev/null
+++ b/03/part2.c
@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+
+#include <algds/str.h>
+#include <algds/vec.h>
+
+
+void getlines(StringVector *lines) {
+    while (1) {
+        char *line = fgetline(stdin);
+        if (line == NULL) {
+            break;
+        }
+        char *nline = str_strip(line);
+        free(line);
+        StringVector_push_back(lines, nline);
+    }
+}
+
+void find_max_impl(const char *line, int len, int64_t *max, int d, int pos, int64_t res) {
+    if (d >= 12) {
+        if (res > *max) {
+            *max = res;
+        }
+        return;
+    }
+    int curmax = -1;
+    IntVector maxidx;
+    IntVector_init(&maxidx);
+    for (int i = pos + 1; i < len - (11-d); i++) {
+        int n = line[i] - '0';
+        if (n > curmax) {
+            IntVector_free(&maxidx);
+            IntVector_init(&maxidx);
+            curmax = n;
+            IntVector_push_back(&maxidx, i);
+        } else if (n == curmax) {
+            IntVector_push_back(&maxidx, i);
+        }
+    }
+    Int *it = IntVector_begin(&maxidx);
+    for (; it < IntVector_end(&maxidx); it++) {
+        int i = *it;
+        find_max_impl(line, len, max, d + 1, i, res * 10 + curmax);
+    }
+}
+
+int64_t find_max(const char *line) {
+    int64_t len = strlen(line);
+    int64_t max = 0;
+    find_max_impl(line, len, &max, 0, -1, 0);
+    return max;
+}
+
+
+int main() {
+    StringVector lines;
+    StringVector_init(&lines);
+    getlines(&lines);
+    String *it = StringVector_begin(&lines);
+    int64_t sum = 0;
+    for (; it != StringVector_end(&lines); it++) {
+        sum += find_max(*it);
+    }
+    printf("%"PRId64"\n", sum);
+    return 0;
+}
+\ No newline at end of file