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Progressive hints first, then the full explanation and implementation when you're ready to cash out.
Review status
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Hints
Open only as much as you need to keep the solve alive.
There is no input. The entire problem is the picture. Yes, really. Classic Codeforces special-problem nonsense.
Read the papers as a grid of digits:
Try summing each row. You get , , and .
This grid is a magic square: every row, column, and diagonal has the same sum.
The common sum is so the required output is just . No algorithm, no input, no drama.
The statement contains no real text and no input. The only useful information is the image, which shows the digits arranged like this:
This is a magic square. Check the rows:
The columns also work:
And so do the diagonals:
So the number the problem wants is the magic constant:
There is no input to parse and no computation needed. Just print .
The program prints one constant.
time and
memory.
#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 << 15 << '\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 << 15 << '\n';
}