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C++
#include<bits stdc++.h="">

using namespace std;

#define MAX_CHAR 256

int findRepeatFirst(char* s)
{

	int p = -1, i, k;

	int hash[MAX_CHAR] = { 0 };


	int pos[MAX_CHAR];

	for (i = 0; i < strlen(s); i++) {
		k = (int)s[i];
		if (hash[k] == 0) {
			hash[k]++;
			pos[k] = i;
		} else if (hash[k] == 1)
			hash[k]++;
	}

	for (i = 0; i < MAX_CHAR; i++) {
		if (hash[i] == 2) {
			if (p == -1)
				p = pos[i];
			else if (p > pos[i])
				p = pos[i];
		}
	}

	return p;
}


int main()
{
	char str[MAX_CHAR];
	cin>>str;
	int pos = findRepeatFirst(str);
	if (pos == -1)
		cout << "YES"<<endl;
 else
   cout << "no"<<endl;
 return="" 0;
}


What I have tried:

C++
#include<bits stdc++.h>

using namespace std;

#define MAX_CHAR 256

int findRepeatFirst(char* s)
{

	int p = -1, i, k;

	int hash[MAX_CHAR] = { 0 };


	int pos[MAX_CHAR];

	for (i = 0; i < strlen(s); i++) {
		k = (int)s[i];
		if (hash[k] == 0) {
			hash[k]++;
			pos[k] = i;
		} else if (hash[k] == 1)
			hash[k]++;
	}

	for (i = 0; i < MAX_CHAR; i++) {
		if (hash[i] == 2) {
			if (p == -1)
				p = pos[i];
			else if (p > pos[i])
				p = pos[i];
		}
	}

	return p;
}


int main()
{
	char str[MAX_CHAR];
	cin>>str;
	int pos = findRepeatFirst(str);
	if (pos == -1)
		cout << "YES"<
Posted
Updated 17-Mar-21 3:51am
v2
Comments
Rick York 17-Mar-21 12:08pm
   
NO!

1 solution

C doesn;t support streams: so cin and cout don't exist.
Use printf and scanf instead.

The logic we can't do anything about: we have no idea what you expect a change of logic to do, and there is little enough logic in that code to start with ...
   

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