TopCoder SRM582: SpaceWarDiv2

public class SpaceWarDiv2 {

    public int minimalFatigue(int[] magicalGirlStrength, int[] enemyStrength, int[] enemyCount) {
        int n = magicalGirlStrength.Length;
        magicalGirlStrength = magicalGirlStrength.OrderByDescending(s => s).ToArray();
        var enemies = Enumerable.Range(0, enemyStrength.Length)
            .SelectMany(i => Enumerable.Repeat(enemyStrength[i], enemyCount[i]))
            .OrderByDescending(s => s)
            .ToArray();

        int[] fatigue = new int[n];

        foreach (var s in enemies) {
            int index = -1;
            for (int i = 0; i < n; i++) {
                if (s <= magicalGirlStrength[i] &&
                    (index == -1 || fatigue[index] > fatigue[i])) {
                    index = i;
                }
            }
            if (index == -1) return -1;
            fatigue[index]++;
        }

        return fatigue.Max();
    }
}