main.js

/*
 * Execute with node.js, and pass the input via stdin, like so:
 *     node main.js < input.txt
 */

var MESSAGE = 'HACKERCUP';

/**
 * The entry point, reads a number n then n datasets from stdin
 * and passes them into run()
 */
function main() {
	process.stdin.resume();
	process.stdin.setEncoding('utf8');
	
	process.stdin.on('data', function (chunk) {
	  var input = chunk.split('\n');
	  for(var i = 1; i <= input[0]; i++) {
	  	var line = input[i].split(' ');

	  	run(line, i);
	  }
	});
}

/**
 * Called when a line is read in by main
 */
function run(data, iteration) {
	var string = '',
		running = true,
		messages = 0;
	for(var i = 0; i < data.length; i++) string += data[i] + ' ';
	
	while(running) {
		for(var j = 0; j < MESSAGE.length; j++) {
			var charI = string.indexOf(MESSAGE.charAt(j));
			if(data.length > 0 && charI > -1) {
				string = string.substring(0, charI) + string.substring(charI + 1);
			} else {
				running = false;
				break;
			}
		}
		if(running) messages++;
	}
	
	console.log('Case #' + iteration + ': ' + messages);
}

main();