Compilare: main.cpp:137:5: warning: "/*" within comment [-Wcomment] /*set_values(); main.cpp: In function 'void set_neighbors(int, int)': main.cpp:6:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define FOR(i, x, y) for(int i = x; i <= y; ++i) main.cpp:82:10: FOR(i, 0, v.sz() - 1) ~~~~~~~~~~~~~~~~ main.cpp:82:6: note: in expansion of macro 'FOR' FOR(i, 0, v.sz() - 1) ^~~ main.cpp: In function 'int main()': main.cpp:123:10: warning: unused variable 'c' [-Wunused-variable] char c; ^