Method getScoreNormalChart

src/statisticsbrowser.cpp:36–103

void StatisticsBrowser::setContest(Contest *contest) { curContest = contest; }

auto StatisticsBrowser::getScoreNormalChart(const QMap<int, int> &scoreCount, int listSize,
                                            int totalScore) -> QString {
	QString buffer = "";
	long long overallScoreSum = 0;
	double scoreDiscrim = 0;
	double scoreStandardDevia = 0;
	int scoreTierPrefix = 0;
	int lastScoreTier = -1;
	int lastScoreTierNum = -1;

	for (auto i = scoreCount.constEnd(); i != scoreCount.constBegin();) {
		i--;
		int curScoreTier = i.key();
		int curScoreTierNum = i.value();

		if (curScoreTier < 0)
			continue;

		overallScoreSum += 1LL * curScoreTier * curScoreTierNum;

		if (lastScoreTier >= 0)
			scoreDiscrim += qLn(1 + 10.00 * (lastScoreTier - curScoreTier) / totalScore) *
			                (1.00 - 1.00 * lastScoreTierNum * curScoreTierNum / listSize / listSize);

		lastScoreTier = curScoreTier;
		lastScoreTierNum = curScoreTierNum;
	}

	double scoreAverage = 1.00 * overallScoreSum / listSize;
	buffer += "<table border=\"-1\">";
	buffer +=
	    QString(R"(<tr><th>%1</th><th>%2</th><th>%3</th><th colspan="2">%4</th><th colspan="2">%5</th></tr>)")
	        .arg(tr("Score"))
	        .arg(tr("Count"))
	        .arg(tr("Ratio"))
	        .arg(tr("Prefix"))
	        .arg(tr("Suffix"));

	for (auto i = scoreCount.constEnd(); i != scoreCount.constBegin();) {
		i--;
		int curScoreTier = i.key();
		int curScoreTierNum = i.value();
		scoreStandardDevia += qPow(curScoreTier - scoreAverage, 2) * curScoreTierNum;
		buffer += "<tr>";
		buffer += QString("<td align=\"right\"><nobr>%1 Pt</nobr></td>")
		              .arg(curScoreTier < 0 ? QString("N/A") : QString::number(curScoreTier));
		buffer += QString("<td align=\"right\"><nobr>%1</nobr></td>").arg(curScoreTierNum);
		buffer += QString("<td align=\"right\"><nobr>%1%</nobr></td>")
		              .arg(QString::number(100.00 * curScoreTierNum / listSize, 'f', 3));
		buffer += QString("<td align=\"right\"><nobr>%1</nobr></td>").arg(listSize - scoreTierPrefix);
		buffer += QString("<td align=\"right\"><nobr>%1%</nobr></td>")
		              .arg(QString::number(100.00 - 100.00 * scoreTierPrefix / listSize, 'f', 3));
		scoreTierPrefix += curScoreTierNum;
		buffer += QString("<td align=\"right\"><nobr>%1</nobr></td>").arg(scoreTierPrefix);
		buffer += QString("<td align=\"right\"><nobr>%1%</nobr></td>")
		              .arg(QString::number(100.00 * scoreTierPrefix / listSize, 'f', 3));
		buffer += "</tr>";
	}