Compilare: user.cpp: In function ‘char bridge()’: user.cpp:54:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ( i > 0 ) ^ user.cpp:59:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ( j > 0 ) ^ user.cpp:64:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ( i < n - 1 ) ^ user.cpp:69:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ( j < m - 1 ) ^