Compilare: main.cpp: In function 'void solve()': main.cpp:42:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(idx<ex.size()) ~~~^~~~~~~~~~ main.cpp: In function 'void task2()': main.cpp:175:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v1.size();i++) ~^~~~~~~~~~ main.cpp:176:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v1[i]!=v1[i+1] || i==v1.size()-1) ~^~~~~~~~~~~~~