17.9.6

leetcode 168

C语言

char* convertToTitle(int n) {
int count = 0, n1 = n;
char alpha[26] = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
while(n1 != 0) {
n1 = (n1 - 1) / 26;
++count;
}
char *result = (char *)malloc((count + 1) * sizeof(char));
result[count] = '\0';
while(n != 0) {
result[--count] = alpha[(n - 1) % 26];
n = (n - 1) / 26;
}
return result;
}