Compilare: main.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] #import<fstream> ^~~~~~ main.cpp: In function 'int w()': main.cpp:2:128: warning: no return statement in function returning non-void [-Wreturn-type] std::ifstream f("combinari.in");std::ofstream g("combinari.out");int N,K,x[19],i;int w(){for(i=1;i<=K;++i)g<<x[i]<<' ';g<<'\n';}int b(int k){if(k==K+1)w();else for(int i=x[k-1]+1;i<=N;++i)x[k]=i,b(k+1);}main(){f>>N>>K;b(1);} ^ main.cpp: In function 'int b(int)': main.cpp:2:203: warning: no return statement in function returning non-void [-Wreturn-type] std::ifstream f("combinari.in");std::ofstream g("combinari.out");int N,K,x[19],i;int w(){for(i=1;i<=K;++i)g<<x[i]<<' ';g<<'\n';}int b(int k){if(k==K+1)w();else for(int i=x[k-1]+1;i<=N;++i)x[k]=i,b(k+1);}main(){f>>N>>K;b(1);} ^ main.cpp: At global scope: main.cpp:2:209: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] std::ifstream f("combinari.in");std::ofstream g("combinari.out");int N,K,x[19],i;int w(){for(i=1;i<=K;++i)g<<x[i]<<' ';g<<'\n';}int b(int k){if(k==K+1)w();else for(int i=x[k-1]+1;i<=N;++i)x[k]=i,b(k+1);}main(){f>>N>>K;b(1);} ^