Compilare: user.cpp: In function ‘void path(int, int)’: user.cpp:45:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘bool Less(std::vector<int>, std::vector<int>)’: user.cpp:57:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:128:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<srt.size();i++) ^ user.cpp:137:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<Sol.size();i++) ^