Compilare: user.cpp:20:32: warning: multi-character character constant [-Wmultichar] if (v[n][E]==(1<<31-1)) g<<'-1'<<'\n'; ^ user.cpp: In function ‘int main()’: user.cpp:12:18: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] v[i][j]=(1<<31-1); ^ user.cpp:20:20: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if (v[n][E]==(1<<31-1)) g<<'-1'<<'\n'; ^