Compilare: user.cpp: In function ‘int bridge()’: user.cpp:55:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ( i > 0 ) ^ user.cpp:60:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ( j > 0 ) ^ user.cpp:65:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ( i < n - 1 ) ^ user.cpp:70:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ( j < m - 1 ) ^