Compilare: main.cpp: In function 'void comutator(int (*)[20], int, int)': main.cpp:70:19: warning: unused variable 'j' [-Wunused-variable] int lin,col,i,j; ^ main.cpp: In function 'int main()': main.cpp:90:23: warning: unused variable 'x' [-Wunused-variable] int a[20][20],n,m,x; ^ main.cpp: In function 'int min_col(int (*)[20], int, int)': main.cpp:45:12: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized] return x; ^ main.cpp: In function 'int min_lin(int (*)[20], int, int)': main.cpp:65:12: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized] return x; ^