#include <stdio.h>
#include <stdlib.h>
int min(int a, int b) {
if (a<b) return a;
return b;
}
int main() {
int n;
for (int i = 0; i<n*2+1; ++i) {
for (int j = 0; j<n*2+1; ++j) {
}
}
}
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