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Handle edge case in LZ compression code and fix docs

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This commit is contained in:
Staszek Welsh 2022-04-28 19:50:17 +01:00
parent 9c805dabb8
commit 55d9810727
3 changed files with 38 additions and 30 deletions
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28
doc/source/basicgameplay/codingcontracts.rst
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@ -336,12 +336,12 @@ The list contains the name of (i.e. the value returned by
| | | |
| | | You are given an LZ-encoded string. Decode it and output the original string. |
| | | |
| | | Example: decoding '5aaabc340533bca' chunk-by-chunk |
| | | 5aaabc -> aaabc |
| | | 5aaabc34 -> aaabcaab |
| | | 5aaabc340 -> aaabcaab |
| | | 5aaabc34053 -> aaabcaabaabaa |
| | | 5aaabc340533bca -> aaabcaabaabaabca |
| | | Example: decoding '5aaabb450723abb' chunk-by-chunk |
| | | 5aaabb -> aaabb |
| | | 5aaabb45 -> aaabbaaab |
| | | 5aaabb450 -> aaabbaaab |
| | | 5aaabb45072 -> aaabbaaababababa |
| | | 5aaabb450723abb -> aaabbaaababababaabb |
+-----------------------------------------+------------------------------------------------------------------------------------------+
| Compression III: LZ Compression | | Lempel-Ziv (LZ) compression is a data compression technique which encodes data using |
| | | references to earlier parts of the data. In this variant of LZ, data is encoded in two |
@ -361,12 +361,12 @@ The list contains the name of (i.e. the value returned by
| | | possible output length. |
| | | |
| | | Examples (some have other possible encodings of minimal length): |
| | | abracadabra -> 7abracad47 |
| | | mississippi -> 4miss433ppi |
| | | aAAaAAaAaAA -> 3aAA53035 |
| | | 2718281828 -> 627182844 |
| | | abcdefghijk -> 9abcdefghi02jk |
| | | aaaaaaaaaaa -> 1a911a |
| | | aaaaaaaaaaaa -> 1a912aa |
| | | aaaaaaaaaaaaa -> 1a91031 |
| | | abracadabra -> 7abracad47 |
| | | mississippi -> 4miss433ppi |
| | | aAAaAAaAaAA -> 3aAA53035 |
| | | 2718281828 -> 627182844 |
| | | abcdefghijk -> 9abcdefghi02jk |
| | | aaaaaaaaaaaa -> 3aaa91 |
| | | aaaaaaaaaaaaa -> 1a91031 |
| | | aaaaaaaaaaaaaa -> 1a91041 |
+-----------------------------------------+------------------------------------------------------------------------------------------+

33
src/data/codingcontracttypes.ts
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@ -1532,7 +1532,8 @@ export const codingContractTypesMetadata: ICodingContractTypeMetadata[] = [
length += 2;
}
}
return ans.length === length;
return ans.length <= length;
},
},
{
@ -1555,12 +1556,12 @@ export const codingContractTypesMetadata: ICodingContractTypeMetadata[] = [
"You are given the following LZ-encoded string:\n",
`&nbsp; &nbsp; ${compressed}\n`,
"Decode it and output the original string.\n\n",
"Example: decoding '5aaabc340533bca' chunk-by-chunk\n",
"&nbsp; &nbsp; 5aaabc &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; -> &nbsp;aaabc\n",
"&nbsp; &nbsp; 5aaabc34 &nbsp; &nbsp; &nbsp; &nbsp; -> &nbsp;aaabcaab\n",
"&nbsp; &nbsp; 5aaabc340 &nbsp; &nbsp; &nbsp; &nbsp;-> &nbsp;aaabcaab\n",
"&nbsp; &nbsp; 5aaabc34053 &nbsp; &nbsp; &nbsp;-> &nbsp;aaabcaabaabaa\n",
"&nbsp; &nbsp; 5aaabc340533bca &nbsp;-> &nbsp;aaabcaabaabaabca",
"Example: decoding '5aaabb450723abb' chunk-by-chunk\n",
"&nbsp; &nbsp; 5aaabb &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; -> &nbsp;aaabb\n",
"&nbsp; &nbsp; 5aaabb45 &nbsp; &nbsp; &nbsp; &nbsp; -> &nbsp;aaabbaaab\n",
"&nbsp; &nbsp; 5aaabb450 &nbsp; &nbsp; &nbsp; &nbsp;-> &nbsp;aaabbaaab\n",
"&nbsp; &nbsp; 5aaabb45072 &nbsp; &nbsp; &nbsp;-> &nbsp;aaabbaaababababa\n",
"&nbsp; &nbsp; 5aaabb450723abb &nbsp;-> &nbsp;aaabbaaababababaabb",
].join(" ");
},
gen: (): string => {
@ -1591,21 +1592,21 @@ export const codingContractTypesMetadata: ICodingContractTypeMetadata[] = [
`&nbsp; &nbsp; ${plaintext}\n`,
"Encode it using Lempel-Ziv encoding with the minimum possible output length.\n\n",
"Examples (some have other possible encodings of minimal length):\n",
"&nbsp; &nbsp; abracadabra &nbsp; &nbsp;-> &nbsp;7abracad47\n",
"&nbsp; &nbsp; mississippi &nbsp; &nbsp;-> &nbsp;4miss433ppi\n",
"&nbsp; &nbsp; aAAaAAaAaAA &nbsp; &nbsp;-> &nbsp;3aAA53035\n",
"&nbsp; &nbsp; 2718281828 &nbsp; &nbsp; -> &nbsp;627182844\n",
"&nbsp; &nbsp; abcdefghijk &nbsp; &nbsp;-> &nbsp;9abcdefghi02jk\n",
"&nbsp; &nbsp; aaaaaaaaaaa &nbsp; &nbsp;-> &nbsp;1a911a\n",
"&nbsp; &nbsp; aaaaaaaaaaaa &nbsp; -> &nbsp;1a912aa\n",
"&nbsp; &nbsp; aaaaaaaaaaaaa &nbsp;-> &nbsp;1a91031",
"&nbsp; &nbsp; abracadabra &nbsp; &nbsp; -> &nbsp;7abracad47\n",
"&nbsp; &nbsp; mississippi &nbsp; &nbsp; -> &nbsp;4miss433ppi\n",
"&nbsp; &nbsp; aAAaAAaAaAA &nbsp; &nbsp; -> &nbsp;3aAA53035\n",
"&nbsp; &nbsp; 2718281828 &nbsp; &nbsp; &nbsp;-> &nbsp;627182844\n",
"&nbsp; &nbsp; abcdefghijk &nbsp; &nbsp; -> &nbsp;9abcdefghi02jk\n",
"&nbsp; &nbsp; aaaaaaaaaaaa &nbsp; &nbsp;-> &nbsp;3aaa91\n",
"&nbsp; &nbsp; aaaaaaaaaaaaa &nbsp; -> &nbsp;1a91031\n",
"&nbsp; &nbsp; aaaaaaaaaaaaaa &nbsp;-> &nbsp;1a91041",
].join(" ");
},
gen: (): string => {
return comprLZGenerate();
},
solver: (plain: string, ans: string): boolean => {
return comprLZDecode(ans) === plain && ans.length === comprLZEncode(plain).length;
return comprLZDecode(ans) === plain && ans.length <= comprLZEncode(plain).length;
},
},
];

7
src/utils/CompressionContracts.ts
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@ -105,6 +105,13 @@ export function comprLZEncode(plain: string): string {
// start new literal
set(new_state, 0, 1, string + length + offset);
// end current backreference and start new backreference
for (let new_offset = 1; new_offset <= Math.min(9, i); ++new_offset) {
if (plain[i - new_offset] === c) {
set(new_state, new_offset, 1, string + length + offset + "0");
}
}
}
}