Question

How to find the largest substring between two equal characters in a string with C

Answer 1

#include <stdio.h>
#include <string.h>
#include <math.h>

void GetLongestSubstring(char str[], char result[]) {
    int start = 0, end = 0, max = 0;

    for (int i = 0; str[i] != '\0'; i++) {
        for (int j = i + 1; str[j] != '\0'; j++) {
            if (str[i] == str[j]) {
                int temp = abs(j - i - 1);
                if (temp > max) {
                    max = temp;
                    start = i + 1;
                    end = j;
                }
            }
        }
    }

    strncat(result, str + start, end - start);
}

int main()
{
    char str[] = "zXoDcprogrammingDkmq";
    char result[32] = "";

    GetLongestSubstring(str, result);

    puts(result);

    return 0;
}




/*
run:

cprogramming

*/

 

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