Submission #69174121

Source Code Expand

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#include <stdio.h>
#include <string.h>
#define MOD_BY 998244353
int mul(int a, int b) {
  return (int)((long long)a * b % MOD_BY);
}
char S[212345];
int main(void) {
  int len, i;
  int ans = 1;
  if (scanf("%212344s", S) != 1) return 1;
  len = (int)strlen(S);
  for (i = 0; i <= len - 1 - i; i++) {
    char a = S[i], b = S[len - 1 - i];
    if (a == '?' && b == '?') {
      ans = mul(ans, 26);
    } else if (a != '?' && b != '?' && a != b) {
 
 
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#include <stdio.h>
#include <string.h>

#define MOD_BY 998244353

int mul(int a, int b) {
	return (int)((long long)a * b % MOD_BY);
}

char S[212345];

int main(void) {
	int len, i;
	int ans = 1;
	if (scanf("%212344s", S) != 1) return 1;
	len = (int)strlen(S);
	for (i = 0; i <= len - 1 - i; i++) {
		char a = S[i], b = S[len - 1 - i];
		if (a == '?' && b == '?') {
			ans = mul(ans, 26);
		} else if (a != '?' && b != '?' && a != b) {
			puts("0");
			return 0;
		}
	}
	printf("%d\n", ans);
	return 0;
}

Submission Info

Judge Result