Compilare: main.cpp: In function 'int main()': main.cpp:52:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<muchii.size();j++){ ~^~~~~~~~~~~~~~ main.cpp:43:13: warning: unused variable 'a' [-Wunused-variable] int a,b,j; ^ main.cpp:43:15: warning: unused variable 'b' [-Wunused-variable] int a,b,j; ^ main.cpp:39:13: warning: unused variable 'k' [-Wunused-variable] int n,i,k=0; ^