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## Link of the question
https://leetcode.com/problems/find-the-duplicate-number/
## Coding platform
- [ ] Hackerrank
- [ ] HackerEarth
- [ ] Codechef
- [ ] Codeforces
- [x] Leetcode
- [ ] …
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## Link of the question
https://www.codechef.com/SEPT21B/problems/PALINT
## Coding platform
- [ ] Hackerrank
- [ ] HackerEarth
- [x] Codechef
- [ ] Codeforces
- [ ] Leetcode
- [ ] InterviewB…
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## Link of the question
https://leetcode.com/problems/trapping-rain-water/
## Coding platform
- [ ] Hackerrank
- [ ] HackerEarth
- [ ] Codechef
- [ ] Codeforces
- [X] Leetcode
- [ ] Interv…
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## Link of the question
https://codeforces.com/contest/1496/problem/B
## Coding platform
- [ ] Hackerrank
- [ ] HackerEarth
- [ ] Codechef
- [x] Codeforces
- [ ] Leetcode
- [ ] InterviewBi…
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## Link of the question
https://leetcode.com/problems/partition-equal-subset-sum/
## Coding platform
- [ ] Hackerrank
- [ ] HackerEarth
- [ ] Codechef
- [ ] Codeforces
- [x] Leetcode
- [ ]…
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## Link of the question
https://www.codechef.com/SEPT21B/problems/POINTMEE
## Coding platform
- [ ] Hackerrank
- [ ] HackerEarth
- [x] Codechef
- [ ] Codeforces
- [ ] Leetcode
- [ ] Intervie…
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## Link of the question
https://leetcode.com/problems/container-with-most-water/
## Coding platform
- [ ] Hackerrank
- [ ] HackerEarth
- [ ] Codechef
- [ ] Codeforces
- [x] Leetcode
- [ ] …
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## Link of the question
https://www.codechef.com/START13B/problems/SWAPGAME
## Coding platform
- [ ] Hackerrank
- [ ] HackerEarth
- [x] Codechef
- [ ] Codeforces
- [ ] Leetcode
- [ ] Intervi…
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## Link of the question
https://www.codechef.com/START13B/problems/DIVPAIRS
## Coding platform
- [ ] Hackerrank
- [ ] HackerEarth
- [x] Codechef
- [ ] Codeforces
- [ ] Leetcode
- [ ] Intervi…
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## Link of the question
https://leetcode.com/problems/remove-duplicate-letters/
## Coding platform
- [ ] Hackerrank
- [ ] HackerEarth
- [ ] Codechef
- [ ] Codeforces
- [x] Leetcode
- [ ] I…