Compilare: main.cpp: In function 'int main()': main.cpp:109:19: warning: 'pos3' may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<pos4-pos3-pos2+pos1<<'\n'; ~~~~^~~~~ main.cpp:109:36: warning: 'pos1' may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<pos4-pos3-pos2+pos1<<'\n'; ^~~~