Compilare: main.cpp: In function 'bool comp(kkt, kkt)': main.cpp:60:37: warning: suggest parentheses around '&&' within '||' [-Wparentheses] return (i.nr<j.nr || i.nr==j.nr && i.cost<j.cost); ~~~~~~~~~~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:69:14: warning: unused variable 'ok' [-Wunused-variable] { bool ok=true; ^~ main.cpp:116:13: warning: unused variable 'drum' [-Wunused-variable] int drum=0,sum=0; ^~~~