suggestion.java

// put your PRICE_START, etc. constants at the very top of your program

int findMaxValue( int start, int end ){
	int maxValue = 0; 
	for( int i = 0; i < lines.length; i++ ){
		if( lines[i].length() >= end ){
			maxValue = max( maxValue, int( lines[i].substring( start, end ) ) ); 
		}
	}
	
	return maxValue; 
}