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Eliminate all ‘b’ and ‘ac’ in an array of characters, you have to replace them in-place, and you are only allowed to iterate over the char array once.
Examples:
abc -> ac
ac->''
rbact->rt
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
The key point is in-place and iteration once.
int eliminate( char* p)
{int deleted = 0;if (! p )return deleted;while (*p){if (*p == 'b')deleted++;else if ( ( *p == 'a' ) && ( *(p+1) == 'c')){deleted += 2;p++;} else if ( deleted > 0 )*(p-deleted) = *p;p++;}*(p-deleted) = '\0';return deleted;
}
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