Compilare: main.cpp: In function 'int main()': main.cpp:107:67: warning: suggest parentheses around assignment used as truth value [-Wparentheses] best [i][j] = viz [i][j] = viz2 [i][j] = h [i][j] = marc [i][j] = 0; ~~~~~~~~~^~~~~~~~~~~~~~~~~ main.cpp:120:13: warning: unused variable 'mmm' [-Wunused-variable] int mmm = M . size (); ^~~ main.cpp:127:13: warning: unused variable 'mmm2' [-Wunused-variable] int mmm2 = M . size (); ^~~~