Add strong-pass-check-2

Author: anvouk

CMakeLists.txt

@@ -5,4 +5,5 @@ add_subdirectory(letter-comb)
 add_subdirectory(lgc)
 add_subdirectory(parentheses)
 add_subdirectory(remove-duplicates-from-sorted)
+add_subdirectory(strong-pass-check-2)
 add_subdirectory(validate-ip)

strong-pass-check-2/CMakeLists.txt

@@ -0,0 +1,3 @@
+set(CMAKE_C_STANDARD 99)
+
+add_executable(strong-pass-check-2 main.c)

strong-pass-check-2/main.c

@@ -0,0 +1,70 @@
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+static bool isPermittedSpecial(char ch)
+{
+    switch (ch) {
+    case '!':
+    case '@':
+    case '#':
+    case '$':
+    case '%':
+    case '^':
+    case '&':
+    case '*':
+    case '(':
+    case ')':
+    case '-':
+    case '+':
+        return true;
+    default:
+        return false;
+    }
+}
+
+bool strongPasswordCheckerII(char *password)
+{
+    if (strlen(password) < 8) {
+        return false;
+    }
+
+    char last_ch = '\0';
+
+    bool has_lower = false;
+    bool has_upper = false;
+    bool has_digit = false;
+    bool has_special = false;
+    for (const char *ch = password; *ch != '\0'; ++ch) {
+        if (*ch == last_ch) {
+            return false;
+        }
+        last_ch = *ch;
+        if (islower(*ch)) {
+            has_lower = true;
+            continue;
+        }
+        if (isupper(*ch)) {
+            has_upper = true;
+            continue;
+        }
+        if (isdigit(*ch)) {
+            has_digit = true;
+            continue;
+        }
+        if (isPermittedSpecial(*ch)) {
+            has_special = true;
+            continue;
+        }
+    }
+
+    return has_lower && has_upper && has_digit && has_special;
+}
+
+/* https://leetcode.com/problems/strong-password-checker-ii/ */
+int main(void)
+{
+    printf("d: %d\n", strongPasswordCheckerII("IloveLe3tcode!"));
+    return 0;
+}