diff --git a/src/base/LemonUtils.hpp b/src/base/LemonUtils.hpp
index c4c60795..67d2c195 100644
--- a/src/base/LemonUtils.hpp
+++ b/src/base/LemonUtils.hpp
@@ -30,6 +30,13 @@ namespace Lemon::detail {
 		} else
 			return -1;
 	}
+	inline qint64 jsonReadHelper(qint64 &val, const QJsonValue &jval) {
+		if (jval.isDouble()) {
+			val = jval.toInteger();
+			return 0;
+		} else
+			return -1;
+	}
 	inline int jsonReadHelper(bool &val, const QJsonValue &jval) {
 		if (jval.isBool()) {
 			val = jval.toBool();
diff --git a/src/component/exportutil/exportutil.cpp b/src/component/exportutil/exportutil.cpp
index ae27ff87..3cb35652 100644
--- a/src/component/exportutil/exportutil.cpp
+++ b/src/component/exportutil/exportutil.cpp
@@ -126,7 +126,7 @@ auto ExportUtil::getContestantHtmlCode(Contest *contest, Contestant *contestant,
 		QList<QList<ResultState>> result = contestant->getResult(i);
 		QList<QStringList> message = contestant->getMessage(i);
 		QList<QList<int>> timeUsed = contestant->getTimeUsed(i);
-		QList<QList<int>> memoryUsed = contestant->getMemoryUsed(i);
+		QList<QList<qint64>> memoryUsed = contestant->getMemoryUsed(i);
 		QList<QList<int>> score = contestant->getScore(i);
 
 		for (int j = 0; j < inputFiles.size(); j++) {
@@ -493,7 +493,7 @@ auto ExportUtil::getSmallerContestantHtmlCode(Contest *contest, Contestant *cont
 		QList<QList<ResultState>> result = contestant->getResult(i);
 		QList<QStringList> message = contestant->getMessage(i);
 		QList<QList<int>> timeUsed = contestant->getTimeUsed(i);
-		QList<QList<int>> memoryUsed = contestant->getMemoryUsed(i);
+		QList<QList<qint64>> memoryUsed = contestant->getMemoryUsed(i);
 		QList<QList<int>> score = contestant->getScore(i);
 
 		for (int j = 0; j < inputFiles.size(); j++) {
diff --git a/src/core/contest.h b/src/core/contest.h
index 83a21942..1aabb6d4 100644
--- a/src/core/contest.h
+++ b/src/core/contest.h
@@ -71,7 +71,7 @@ class Contest : public QObject {
 	void taskDeletedForViewer(int);
 	void problemTitleChanged();
 	void dialogAlert(QString);
-	void singleCaseFinished(QString, int, int, int, int, int, int, int);
+	void singleCaseFinished(QString, int, int, int, int, int, int, qint64);
 	void singleSubtaskDependenceFinished(int, int, int);
 	void taskJudgingStarted(QString);
 	void taskJudgingFinished();
diff --git a/src/core/contestant.cpp b/src/core/contestant.cpp
index f9f0fb01..d6112716 100644
--- a/src/core/contestant.cpp
+++ b/src/core/contestant.cpp
@@ -36,7 +36,7 @@ auto Contestant::getScore(int index) const -> const QList<QList<int>> & { return
 
 auto Contestant::getTimeUsed(int index) const -> const QList<QList<int>> & { return timeUsed[index]; }
 
-auto Contestant::getMemoryUsed(int index) const -> const QList<QList<int>> & { return memoryUsed[index]; }
+auto Contestant::getMemoryUsed(int index) const -> const QList<QList<qint64>> & { return memoryUsed[index]; }
 
 auto Contestant::getJudingTime() const -> QDateTime { return judgingTime; }
 
@@ -60,7 +60,7 @@ void Contestant::setScore(int index, const QList<QList<int>> &_score) { score[in
 
 void Contestant::setTimeUsed(int index, const QList<QList<int>> &_timeUsed) { timeUsed[index] = _timeUsed; }
 
-void Contestant::setMemoryUsed(int index, const QList<QList<int>> &_memoryUsed) {
+void Contestant::setMemoryUsed(int index, const QList<QList<qint64>> &_memoryUsed) {
 	memoryUsed[index] = _memoryUsed;
 }
 
@@ -76,7 +76,7 @@ void Contestant::addTask() {
 	message.append(QList<QStringList>());
 	score.append(QList<QList<int>>());
 	timeUsed.append(QList<QList<int>>());
-	memoryUsed.append(QList<QList<int>>());
+	memoryUsed.append(QList<QList<qint64>>());
 }
 
 void Contestant::deleteTask(int index) {
@@ -236,7 +236,20 @@ void Contestant::readFromStream(QDataStream &in) {
 	in >> message;
 	in >> score;
 	in >> timeUsed;
-	in >> memoryUsed;
+	// memoryUsed 之前存储为 int 三维数组，现在改为了 qint64，因此先读取旧结构，再逐层转换
+	QList<QList<QList<int>>> oldMemoryUsed;
+	in >> oldMemoryUsed;
+	for (const auto &l1 : oldMemoryUsed) {
+		QList<QList<qint64>> newL1;
+		for (const auto &l2 : l1) {
+			QList<qint64> newL2;
+			for (int v : l2) {
+				newL2.append(v);
+			}
+			newL1.append(newL2);
+		}
+		memoryUsed.append(newL1);
+	}
 	quint32 judgingTime_date = 0;
 	quint32 judgingTime_time = 0;
 	quint8 judgingTime_timespec = 0;
diff --git a/src/core/contestant.h b/src/core/contestant.h
index b9f693f7..2cd008ac 100644
--- a/src/core/contestant.h
+++ b/src/core/contestant.h
@@ -30,7 +30,7 @@ class Contestant : public QObject {
 	const QList<QStringList> &getMessage(int) const;
 	const QList<QList<int>> &getScore(int) const;
 	const QList<QList<int>> &getTimeUsed(int) const;
-	const QList<QList<int>> &getMemoryUsed(int) const;
+	const QList<QList<qint64>> &getMemoryUsed(int) const;
 	QDateTime getJudingTime() const;
 	int getTaskScore(int) const;
 	int getTotalScore() const;
@@ -46,7 +46,7 @@ class Contestant : public QObject {
 	void setMessage(int, const QList<QStringList> &);
 	void setScore(int, const QList<QList<int>> &);
 	void setTimeUsed(int, const QList<QList<int>> &);
-	void setMemoryUsed(int, const QList<QList<int>> &);
+	void setMemoryUsed(int, const QList<QList<qint64>> &);
 	void setJudgingTime(QDateTime);
 
 	int writeToJson(QJsonObject &);
@@ -64,7 +64,7 @@ class Contestant : public QObject {
 	QList<QList<QStringList>> message;
 	QList<QList<QList<int>>> score;
 	QList<QList<QList<int>>> timeUsed;
-	QList<QList<QList<int>>> memoryUsed;
+	QList<QList<QList<qint64>>> memoryUsed;
 	QDateTime judgingTime;
 
 	// QList<TaskResult> taskResults;
diff --git a/src/core/judgingthread.cpp b/src/core/judgingthread.cpp
index 310ae1df..b19af4d3 100644
--- a/src/core/judgingthread.cpp
+++ b/src/core/judgingthread.cpp
@@ -82,7 +82,7 @@ void JudgingThread::setInterpreterAsWatcher(bool use) { interpreterAsWatcher = u
 
 auto JudgingThread::getTimeUsed() const -> int { return timeUsed; }
 
-auto JudgingThread::getMemoryUsed() const -> int { return memoryUsed; }
+auto JudgingThread::getMemoryUsed() const -> qint64 { return memoryUsed; }
 
 auto JudgingThread::getScore() const -> int { return score; }
 
@@ -828,4 +828,4 @@ void JudgingThread::run() {
 			judgeAnswersOnlyTask();
 			break;
 	}
-}
+}
\ No newline at end of file
diff --git a/src/core/judgingthread.h b/src/core/judgingthread.h
index 0109d724..8e632452 100644
--- a/src/core/judgingthread.h
+++ b/src/core/judgingthread.h
@@ -41,7 +41,7 @@ class JudgingThread : public QThread {
 	void setRawMemoryLimit(int);
 	void setInterpreterAsWatcher(bool);
 	int getTimeUsed() const;
-	int getMemoryUsed() const;
+	qint64 getMemoryUsed() const;
 	int getScore() const;
 	int getFullScore() const;
 	int getJudgeTimes() const;
@@ -72,7 +72,7 @@ class JudgingThread : public QThread {
 	int memoryLimit{};
 	int rawMemoryLimit{};
 	int timeUsed;
-	int memoryUsed;
+	qint64 memoryUsed;
 	int score{};
 	int judgedTimes;
 	ResultState result;
diff --git a/src/core/processrunner.h b/src/core/processrunner.h
index a749cd4e..40d3ec1d 100644
--- a/src/core/processrunner.h
+++ b/src/core/processrunner.h
@@ -36,7 +36,7 @@ struct ProcessRunnerResult {
 	ResultState result = CorrectAnswer;
 	int score = 0;
 	int timeUsed = -1;
-	int memoryUsed = -1;
+	qint64 memoryUsed = -1;
 	QString message;
 };
 
diff --git a/src/core/processrunner_win.cpp b/src/core/processrunner_win.cpp
index a1090389..35ee2907 100644
--- a/src/core/processrunner_win.cpp
+++ b/src/core/processrunner_win.cpp
@@ -268,7 +268,8 @@ ProcessRunnerResult WinProcessRunner::run() {
 	if (config.memoryLimit != -1) {
 		GetProcessMemoryInfo(pi.hProcess, (PROCESS_MEMORY_COUNTERS *)&memoryInfo, sizeof(memoryInfo));
 
-		if (qMax(memoryInfo.PrivateUsage, memoryInfo.PeakWorkingSetSize) > config.memoryLimit * 1024 * 1024) {
+		if (qMax(memoryInfo.PrivateUsage, memoryInfo.PeakWorkingSetSize) >
+		    1ll * config.memoryLimit * 1024 * 1024) {
 			TerminateProcess(pi.hProcess, 0);
 
 			res.score = 0;
@@ -292,7 +293,7 @@ ProcessRunnerResult WinProcessRunner::run() {
 			GetProcessMemoryInfo(pi.hProcess, (PROCESS_MEMORY_COUNTERS *)&memoryInfo, sizeof(memoryInfo));
 
 			if (qMax(memoryInfo.PrivateUsage, memoryInfo.PeakWorkingSetSize) >
-			    config.memoryLimit * 1024U * 1024) {
+			    1ll * config.memoryLimit * 1024 * 1024) {
 				TerminateProcess(pi.hProcess, 0);
 				res.score = 0;
 				res.result = MemoryLimitExceeded;
diff --git a/src/core/taskjudger.cpp b/src/core/taskjudger.cpp
index e566c9c6..2b289f69 100644
--- a/src/core/taskjudger.cpp
+++ b/src/core/taskjudger.cpp
@@ -360,7 +360,7 @@ int TaskJudger::judge() {
 
 	for (int i = 0; i < task->getTestCaseList().size(); i++) {
 		timeUsed.append(QList<int>());
-		memoryUsed.append(QList<int>());
+		memoryUsed.append(QList<qint64>());
 		score.append(QList<int>());
 		result.append(QList<ResultState>());
 		overallStatus.append(maxDependValue);
diff --git a/src/core/taskjudger.h b/src/core/taskjudger.h
index c7cd0db9..4a8fd7a8 100644
--- a/src/core/taskjudger.h
+++ b/src/core/taskjudger.h
@@ -56,7 +56,7 @@ class TaskJudger : public QObject {
 	QProcessEnvironment environment;
 	QList<int> overallStatus;
 	QList<QList<int>> timeUsed;
-	QList<QList<int>> memoryUsed;
+	QList<QList<qint64>> memoryUsed;
 	QList<QList<int>> score;
 	QList<QList<ResultState>> result;
 	QList<QStringList> message;
@@ -81,7 +81,7 @@ class TaskJudger : public QObject {
 	void judgingStarted(QString);
 	void judgingFinished();
 	void dialogAlert(QString);
-	void singleCaseFinished(QString, int, int, int, int, int, int, int);
+	void singleCaseFinished(QString, int, int, int, int, int, int, qint64);
 	void singleSubtaskDependenceFinished(int, int, int);
 	void compileError(int, int);
 	void stopJudgingSignal();
diff --git a/src/detaildialog.cpp b/src/detaildialog.cpp
index 15533d96..e2d59d45 100644
--- a/src/detaildialog.cpp
+++ b/src/detaildialog.cpp
@@ -133,7 +133,7 @@ void DetailDialog::refreshViewer(Contest *_contest, Contestant *_contestant) {
 		QList<QList<ResultState>> result = contestant->getResult(i);
 		QList<QStringList> message = contestant->getMessage(i);
 		QList<QList<int>> timeUsed = contestant->getTimeUsed(i);
-		QList<QList<int>> memoryUsed = contestant->getMemoryUsed(i);
+		QList<QList<qint64>> memoryUsed = contestant->getMemoryUsed(i);
 		QList<QList<int>> score = contestant->getScore(i);
 
 		for (int j = 0; j < inputFiles.size(); j++) {
diff --git a/src/judgingdialog.cpp b/src/judgingdialog.cpp
index c703820b..38d64991 100644
--- a/src/judgingdialog.cpp
+++ b/src/judgingdialog.cpp
@@ -83,7 +83,7 @@ void JudgingDialog::judgeAll() {
 }
 
 void JudgingDialog::singleCaseFinished(QString contestantName, int progress, int x, int y, int result,
-                                       int scoreGot, int timeUsed, int memoryUsed) {
+                                       int scoreGot, int timeUsed, qint64 memoryUsed) {
 	bool isOnMaxValue =
 	    ui->logViewer->verticalScrollBar()->value() == ui->logViewer->verticalScrollBar()->maximum();
 	QTextBlockFormat blockFormat;
diff --git a/src/judgingdialog.h b/src/judgingdialog.h
index 66b9fdad..c41b39e7 100644
--- a/src/judgingdialog.h
+++ b/src/judgingdialog.h
@@ -43,7 +43,7 @@ class JudgingDialog : public QDialog {
 
   public slots:
 	void dialogAlert(const QString &);
-	void singleCaseFinished(QString, int, int, int, int, int, int, int);
+	void singleCaseFinished(QString, int, int, int, int, int, int, qint64);
 	void singleSubtaskDependenceFinished(int, int, int);
 	void taskJudgingStarted(const QString &);
 	void taskJudgedDisplay(const QString &, const QList<QList<int>> &, const int);