Compilare: main.cpp:67:27: warning: multi-character character constant [-Wmultichar] 67 | v[i][0]=v[i][m+1]='-1'; | ^~~~ main.cpp:69:27: warning: multi-character character constant [-Wmultichar] 69 | v[0][j]=v[n+1][j]='-1'; | ^~~~ main.cpp: In function 'int main()': main.cpp:67:27: warning: overflow in conversion from 'int' to 'char' changes value from '11569' to ''1'' [-Woverflow] 67 | v[i][0]=v[i][m+1]='-1'; | ^~~~ main.cpp:69:27: warning: overflow in conversion from 'int' to 'char' changes value from '11569' to ''1'' [-Woverflow] 69 | v[0][j]=v[n+1][j]='-1'; | ^~~~ main.cpp:76:20: warning: unused variable 'cnt' [-Wunused-variable] 76 | int x=a[n][m], cnt=0; | ^~~