Compilare: main.cpp: In function 'int main()': main.cpp:26:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sir.size();i++) ~^~~~~~~~~~~ main.cpp:31:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<sir.size();i++) ~^~~~~~~~~~~ main.cpp:62:24: warning: 'p2' may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<p1<<" "<<p2<<"\n"; ^~~~ main.cpp:62:15: warning: 'p1' may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<p1<<" "<<p2<<"\n"; ^~~