Compilare: main.cpp: In function 'int main()': main.cpp:60:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(c1<=m) ^ main.cpp:66:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(c2<=m) ^ main.cpp:51:15: warning: unused variable 'max_diff' [-Wunused-variable] long long max_diff = 0; ^~~~~~~~