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ratings updated! |
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How do you check if you’re marked as unrated? Does it not display your rank or is there text somewhere that says it? |
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https://ide.usaco.guide/OXKfvhJptJSF_8NYFqW input: 1 4 5 4 3 1 2 7 100000 1 The compiler here outputs 'YES'. |
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I found it! It arises from repeating from the 'r+1' index, which neglects index 'r'. Here's a test case that outputs "YES" on yours, which is incorrect: a=[101,100,011,001], b=[010,111,10101010,01]. Taking a look at index 3, $$$10101010$$$ of course cannot be created with XOR of any of the elements in array $$$a$$$. However, your algorithm looks at 101^100^011==010, and skips to index 4 without taking a look at index 3. |
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If I understand correctly, in the problem statement, it says the XOR operation can be performed at most once for each index. |
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Great problems! |
