Compilare: main.cpp: In function 'int main()': main.cpp:23:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<cop.size()-1;i++) { ~^~~~~~~~~~~~~ main.cpp:33:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<=cop.size()-1;i++) { ~^~~~~~~~~~~~~~ main.cpp:39:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i!=0 && i!=cop.size()-1) { ~^~~~~~~~~~~~~~ main.cpp:44:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i==cop.size()-1) { ~^~~~~~~~~~~~~~ main.cpp:32:18: warning: unused variable 'da' [-Wunused-variable] int nr=0,da,i; ^~