Compilare: main.cpp: In function 'int main()': main.cpp:21:19: warning: comparison with string literal results in unspecified behavior [-Waddress] if (op == "I") { ^~~ main.cpp:29:24: warning: comparison with string literal results in unspecified behavior [-Waddress] else if (op == "S") ^~~ main.cpp:47:24: warning: comparison with string literal results in unspecified behavior [-Waddress] else if (op == "C") ^~~ main.cpp:53:24: warning: comparison with string literal results in unspecified behavior [-Waddress] else if (op == "MAX"){ ^~~~~ main.cpp:57:22: warning: comparison with string literal results in unspecified behavior [-Waddress] else if (op=="MIN"){ ^~~~~ main.cpp:59:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<arr.size()-1; i++){ ~^~~~~~~~~~~~~