Compilare: main.cpp: In function 'bool Check(config)': main.cpp:54:77: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if ((x.a & (1 << i)) != (x.a & (1 << j)) && (Up(x, i, j, false) && Down(x, i, j, true) || Up(x, i, j, true) && Down(x, i, j, false))) ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:110:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < next.m.size(); ++i) ~~^~~~~~~~~~~~~~~