Compilare: main.cpp: In function 'int main()': main.cpp:56:103: warning: operation on 'j' may be undefined [-Wsequence-point] 56 | for(int j = i; !vis[j] && !vis[(j == 1 ? n : j - 1)] && !vis[(j == n ? 1 : j + 1)]; j += 2, j = (j > n ? j %= n : j)){ | ~~^~~~~~~~~~~~~~~~~~~~~~