Compilare: user.cpp: In function ‘int main()’: user.cpp:13:9: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] f>>N+1>>M+1; ^ user.cpp:13:14: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] f>>N+1>>M+1; ^ user.cpp:11:20: warning: unused variable ‘j’ [-Wunused-variable] register int i,j; ^