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Progressive hints first, then the full explanation and implementation when you're ready to cash out.
Review status
AI-generated and still unreviewed. Double-check the details before internalizing them.
Hints
Open only as much as you need to keep the solve alive.
There is no real input. The image is the statement, because April Fools problems apparently hate plaintext.
The colorblind warning is mostly bait. The title Double Vision is the useful clue: think about using two eyes, not parsing colors.
The repeating noisy pattern is not random decoration. It is an autostereogram, also known as a “Magic Eye” image.
View the image with the proper stereogram technique, or feed it into an autostereogram solver. You should recover a hidden string .
The hidden string is . Since the checker only wants that, the whole solution is just printing it exactly.
The statement gives us no usable text input and the sample is empty. That is already screaming “special checker / fixed output.” The only meaningful object is the image.
The line about colorblindness is a beautiful little trap. The real clue is the title: Double Vision. The image is an autostereogram: a repeated noisy pattern where a hidden message appears if you view it with both eyes using the right focus technique.
If you view the picture as a stereogram, or use an online/autonomous autostereogram decoder, the embedded text is
There is no variable input, no algorithmic state, no dynamic programming wizardry hiding in the bushes. The required output is simply this string.
and terminate.
The hidden statement encoded in the autostereogram asks for the string .
The program outputs exactly . Therefore its output matches the required answer, so it is accepted. QED, with maximum nonsense-per-byte.
The program performs work and uses memory.
Official source checked: Codeforces editorial.
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
void setIO() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
}
int main() {
setIO();
cout << "YU5zV2VS\n";
}#include <bits/stdc++.h>
using namespace std;
using ll = long long;
void setIO() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
}
int main() {
setIO();
cout << "YU5zV2VS\n";
}