Compilare: user.cpp: In function ‘int main()’: user.cpp:15:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=N;i++) ^ user.cpp:19:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(c<pret[j] || pret[j]==0)pret[j]=c; ^ user.cpp:23:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=T;i++) ^ user.cpp:12:23: warning: variable ‘t’ set but not used [-Wunused-but-set-variable] { int suma=0,i,a,b,c,t; ^