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| Problem ID | Title | Solution by | Most Popular Input by |
|---|---|---|---|
| R6PL | Harbinger vs Sciencepal |
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| RANDMOD | Random Modulo N |
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| RANDOMBINGOCARDS | Random Bingo Cards |
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| RANGESUM | Range Sum |
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| RAONE | Ra-One Numbers | ||
| RCB | Richest Beggar |
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| REAYZCODETST | Coding Test |
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| REDARR2 | Reduce the Array |
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| REVFIB | Revenge of Fibonacci |
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| RGBRED | Color Play |
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| RIOI_3_2 | Counting |
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| RIVALS | Rivals |
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| RKRCTAN | The Attack Titan |
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| RLM | Run-Length Mathematics |
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| RMID | Running Median |
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| RMQSQ | Range Minimum Query | ||
| ROOKS | Chess Part1 |
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| RPLA | Answer the Boss! |
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| RPLC | Coke Madness |
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| RPLN | Negative Score | ||
| RSHIFT | Right Shift |
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