public override IEnumerable <object> Solve(TextReader inputStream)
{
var hw = inputStream.ReadIntArray();
var height = hw[0];
var width = hw[1];
var states = new int[height][];
for (int row = 0; row < height; row++)
{
states[row] = inputStream.ReadIntArray();
}
var bitStates = GetBitState(states);
int max = 0;
var mask = BitSet.CreateMask(height);
for (BitSet flip = BitSet.Zero; flip < BitSet.At(height); flip++)
{
var count = 0;
for (int column = 0; column < width; column++)
{
var state = bitStates[column] ^ flip;
count += Math.Max(state.Count(), (~state & mask).Count());
}
max = Math.Max(max, count);
}
yield return(max);
}
public override IEnumerable <object> Solve(TextReader inputStream)
{
var dg = inputStream.ReadIntArray();
var maxDifficulty = dg[0];
var requiredScore = dg[1];
var problems = new int[maxDifficulty];
var bonuses = new int[maxDifficulty];
for (int difficulty = 0; difficulty < maxDifficulty; difficulty++)
{
var pc = inputStream.ReadIntArray();
problems[difficulty] = pc[0];
bonuses[difficulty] = pc[1];
}
var minSolved = int.MaxValue;
for (BitSet flag = BitSet.Zero; flag < BitSet.At(maxDifficulty); flag++)
{
var solved = 0;
var score = 0;
for (int difficulty = 0; difficulty < maxDifficulty; difficulty++)
{
if (flag[difficulty])
{
score += (difficulty + 1) * 100 * problems[difficulty] + bonuses[difficulty];
solved += problems[difficulty];
}
}
for (int difficulty = maxDifficulty - 1; difficulty >= 0; difficulty--)
{
if (score >= requiredScore)
{
break;
}
var scorePerQuestion = (difficulty + 1) * 100;
if (!flag[difficulty])
{
var toSolve = Math.Min((requiredScore - score + scorePerQuestion - 1) / scorePerQuestion, problems[difficulty] - 1);
solved += toSolve;
score += scorePerQuestion * toSolve;
}
}
if (score >= requiredScore)
{
minSolved = Math.Min(minSolved, solved);
}
}
yield return(minSolved);
}