int unsigned long
largestPalindrome(int unsigned long a, int unsigned long b, int unsigned long palin) {
if (a < 1) {
return palin;
}
if (b < 1) {
return largestPalindrome(a-1, a-2, palin);
}
int unsigned long temp = a*b;
if (temp < palin) {
if ((a-1)*(a-1) < palin) {
return palin;
} else {
return largestPalindrome(a-1, a-2, palin);
}
}
if (ispalindrome(temp)) {
if (temp > palin) {
palin = temp;
printf("New palindrome! %lu\n", palin);
if ((a-1)*(a-2) < palin) {
return palin;
} else {
return largestPalindrome(a-1, a-2, palin);
}
}
}
return largestPalindrome(a, b-1, palin);
}
int main() {
int cases, n;
testCases();
scanf("%d", &cases);
while (cases--) {
scanf("%d", &n);
printf("%d\n", largestPalindrome(n));
}
return 0;
}
int main(int argc, char *argv[]) {
int unsigned long num1 = 999;
int unsigned long num2 = 999;
int unsigned long palin = 1;
bool ispalindrome(int unsigned long);
int unsigned long largestPalindrome(int unsigned long, int unsigned long, int unsigned long);
if (argc > 1) {
num1 = strtol(argv[1], (char **)NULL, 10);
num2 = num1;
}
printf("%lu, %lu\n", num1, num2);
palin = largestPalindrome(num1, num2, palin);
printf("The number %lu is the largest palindrome\n", palin);
return 0;
}
int main()
{
std::cout << largestPalindrome() << std::endl;
return 0;
}
int main(int argc, const char * argv[])
{
int answer = largestPalindrome(3);
std::cout << "Project Euler - Problem 4: " << answer << std::endl;
return 0;
}
void testCases() {
int largest = largestPalindrome(800000);
largestPalindrome(101110) == 101101 ? printf("success\n") : printf("failed %d is incorrect\n", largest);
largest = largestPalindrome(800000);
largestPalindrome(800000) == 793397 ? printf("success\n") : printf("failed %d is incorrect\n", largest);
}
