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feat(be): implement contest statistics leaderboard #3345

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5b316d4
chore: append userId to get leaderboard
hjkim24 Jan 9, 2026
cbd2b7e
feat: impl get all submissions by contest
hjkim24 Jan 9, 2026
a3478cb
chore(be): add seed data for submissions
hjkim24 Jan 9, 2026
759380e
docs(be): add bruno
hjkim24 Jan 9, 2026
ac77a12
chore(be): processing error for undefined order
hjkim24 Jan 20, 2026
c434664
Merge branch 'main' into t2397-implement-leaderboard-statistics
hjkim24 Jan 20, 2026
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8 changes: 8 additions & 0 deletions apps/backend/apps/client/src/contest/contest.controller.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -199,6 +199,14 @@ export class ContestController {
problemId
)
}

@Get(':id/statistics/submissions')
async getAllSubmissionsByContest(
@Param('id', IDValidationPipe) contestId: number
) {
return await this.contestService.getAllSubmissionsByContest(contestId)
}

@Get(':id/problem/:problemId/statistics/graph')
@UserNullWhenAuthFailedIfPublic()
async getContestProblemStatistics(
Expand Down
67 changes: 65 additions & 2 deletions apps/backend/apps/client/src/contest/contest.service.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,8 @@ import {
import {
ConflictFoundException,
EntityNotExistException,
ForbiddenAccessException
ForbiddenAccessException,
UnprocessableDataException
} from '@libs/exception'
import { PrismaService } from '@libs/prisma'
import {
Expand Down Expand Up @@ -569,6 +570,7 @@ export class ContestService {

return {
username: user!.username,
userId,
totalScore: isFrozen ? score : finalScore,
totalPenalty: isFrozen ? totalPenalty : finalTotalPenalty,
problemRecords,
Expand Down Expand Up @@ -1225,7 +1227,7 @@ export class ContestService {
throw new EntityNotExistException('Contest')
}
const now = new Date()
if (contest.endTime <= now) {
if (contest.endTime > now) {
throw new ForbiddenAccessException(
'You can access to statistics after contest ends.'
)
Expand Down Expand Up @@ -1418,6 +1420,67 @@ export class ContestService {
}

/**
* 실시간 리더보드를 위해 대회의 모든 Submission을 반환합니다.
* @param contestId - 조회할 대회의 ID
* @returns submissionsWithOrder - 실시간 리더보드 구현에 필요한 형태의 Submission 리스트
*/
async getAllSubmissionsByContest(contestId: number) {
await this.checkIsContestExistsAndEnded(contestId)

const [contestProblems, submissions] = await Promise.all([
this.prisma.contestProblem.findMany({
where: {
contestId
},
select: {
problemId: true,
order: true
}
}),
this.prisma.submission.findMany({
where: { contestId },
select: {
problemId: true,
problem: {
select: {
title: true
}
},
userId: true,
user: {
select: {
username: true
}
},
result: true,
language: true,
codeSize: true,
id: true,
createTime: true
}
})
])

const problemOrderMap = new Map(
contestProblems.map((cp) => [cp.problemId, cp.order])
)

return submissions.map((submission) => {
const { user, problem, ...rest } = submission
const order = problemOrderMap.get(submission.problemId)
if (order === undefined) {
throw new UnprocessableDataException(
`Problem ${submission.problemId} is not found in contest ${contestId}`
)
}
return {
...rest,
username: user!.username,
title: problem!.title,
order
}
})
/**
* 대회 statistics 페이지의 문제별 통계 그래프를 조회합니다.
* 대회 종료 후에만 조회할 수 있습니다.
*
Expand Down
271 changes: 271 additions & 0 deletions apps/backend/prisma/seed.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -2733,6 +2733,277 @@ int main(void) {
data: { result: ResultStatus.OutputLimitExceeded }
})

submissions.push(
await prisma.submission.create({
data: {
userId: users[0].id,
problemId: problems[4].id,
contestId: contests[5].id,
code: [
{
id: 1,
locked: false,
text: `#include <stdio.h>
int main(void) {
int n;
scanf("%d", &n);
printf("%d\\n", n * 2);
return 0;
}`
}
],
language: Language.C,
result: ResultStatus.Judging
}
})
)
await prisma.submissionResult.create({
data: {
submissionId: submissions[submissions.length - 1].id,
problemTestcaseId: problemTestcases[4].id,
result: ResultStatus.Accepted,
output: '10\n',
cpuTime: 1234,
memoryUsage: 5120
}
})
await prisma.submission.update({
where: {
id: submissions[submissions.length - 1].id
},
data: { result: ResultStatus.Accepted }
})

submissions.push(
await prisma.submission.create({
data: {
userId: users[1].id,
problemId: problems[4].id,
contestId: contests[5].id,
code: [
{
id: 1,
locked: false,
text: `#include <iostream>
using namespace std;
int main() {
int n;
cin >> n;
cout << n + 1 << endl;
return 0;
}`
}
],
language: Language.Cpp,
result: ResultStatus.Judging
}
})
)
await prisma.submissionResult.create({
data: {
submissionId: submissions[submissions.length - 1].id,
problemTestcaseId: problemTestcases[4].id,
result: ResultStatus.WrongAnswer,
output: '6\n',
cpuTime: 2345,
memoryUsage: 6144
}
})
await prisma.submission.update({
where: {
id: submissions[submissions.length - 1].id
},
data: { result: ResultStatus.WrongAnswer }
})

submissions.push(
await prisma.submission.create({
data: {
userId: users[2].id,
problemId: problems[5].id,
contestId: contests[5].id,
code: [
{
id: 1,
locked: false,
text: `class Main {
public static void main(String[] args) {
java.util.Scanner sc = new java.util.Scanner(System.in);
int n = sc.nextInt();
System.out.println(n * n);
}
}`
}
],
language: Language.Java,
result: ResultStatus.Judging
}
})
)
await prisma.submissionResult.create({
data: {
submissionId: submissions[submissions.length - 1].id,
problemTestcaseId: problemTestcases[5].id,
result: ResultStatus.Accepted,
output: '25\n',
cpuTime: 3456,
memoryUsage: 8192
}
})
await prisma.submission.update({
where: {
id: submissions[submissions.length - 1].id
},
data: { result: ResultStatus.Accepted }
})

submissions.push(
await prisma.submission.create({
data: {
userId: users[3].id,
problemId: problems[4].id,
contestId: contests[5].id,
code: [
{
id: 1,
locked: false,
text: `while True:
pass`
}
],
language: Language.Python3,
result: ResultStatus.Judging
}
})
)
await prisma.submissionResult.create({
data: {
submissionId: submissions[submissions.length - 1].id,
problemTestcaseId: problemTestcases[4].id,
result: ResultStatus.TimeLimitExceeded,
output: null,
cpuTime: 5000,
memoryUsage: 4096
}
})
await prisma.submission.update({
where: {
id: submissions[submissions.length - 1].id
},
data: { result: ResultStatus.TimeLimitExceeded }
})

submissions.push(
await prisma.submission.create({
data: {
userId: users[4].id,
problemId: problems[5].id,
contestId: contests[5].id,
code: [
{
id: 1,
locked: false,
text: `#include <stdio.h>
int main(void) {
int arr[10];
printf("%d\\n", arr[100]);
return 0;
}`
}
],
language: Language.C,
result: ResultStatus.Judging
}
})
)
await prisma.submissionResult.create({
data: {
submissionId: submissions[submissions.length - 1].id,
problemTestcaseId: problemTestcases[5].id,
result: ResultStatus.RuntimeError,
output: null,
cpuTime: 123,
memoryUsage: 2048
}
})
await prisma.submission.update({
where: {
id: submissions[submissions.length - 1].id
},
data: { result: ResultStatus.RuntimeError }
})

submissions.push(
await prisma.submission.create({
data: {
userId: users[0].id,
problemId: problems[5].id,
contestId: contests[5].id,
code: [
{
id: 1,
locked: false,
text: `print(int(input()) ** 2)`
}
],
language: Language.Python3,
result: ResultStatus.Judging
}
})
)
await prisma.submissionResult.create({
data: {
submissionId: submissions[submissions.length - 1].id,
problemTestcaseId: problemTestcases[5].id,
result: ResultStatus.Accepted,
output: '25\n',
cpuTime: 456,
memoryUsage: 3072
}
})
await prisma.submission.update({
where: {
id: submissions[submissions.length - 1].id
},
data: { result: ResultStatus.Accepted }
})

submissions.push(
await prisma.submission.create({
data: {
userId: users[5].id,
problemId: problems[4].id,
contestId: contests[5].id,
code: [
{
id: 1,
locked: false,
text: `#include <stdio.h>
int main(void) {
printf("Hello World"
return 0;
}`
}
],
language: Language.C,
result: ResultStatus.Judging
}
})
)
await prisma.submissionResult.create({
data: {
submissionId: submissions[submissions.length - 1].id,
problemTestcaseId: problemTestcases[4].id,
result: ResultStatus.CompileError
}
})
await prisma.submission.update({
where: {
id: submissions[submissions.length - 1].id
},
data: { result: ResultStatus.CompileError }
})

const checkSeeds = users.map(async (user) => {
const newSubmission = await prisma.submission.create({
data: {
Expand Down
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