Remove Duplicates
C
Hard
2 views
Problem Description
Remove duplicate characters from a string. Each character must appear only once in the resulting string. Maintain order.
Official Solution
#include <stdio.h>
int main() {
char str[200];
int seen[256] = {0};
int i, index = 0;
printf("Enter a string: ");
fgets(str, sizeof(str), stdin);
for (i = 0; str[i] != ' '; i++) {
unsigned char ch = str[i];
// Skip newline
if (ch == 'n')
continue;
if (seen[ch] == 0) {
seen[ch] = 1;
str[index] = ch;
index++;
}
}
str[index] = ' '; // terminate modified string
printf("String after removing duplicates: %sn", str);
return 0;
}
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