Compilare: user.cpp:1:9: warning: #pragma once in main file #pragma once ^~~~ user.cpp: In function ‘int main()’: user.cpp:62:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < precedent.size(); i++) { ~~^~~~~~~~~~~~~~~~~~ user.cpp:54:14: warning: unused variable ‘G2’ [-Wunused-variable] int nr, G1, G2, total=0; ^~ user.cpp:71:34: warning: ‘G1’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << total - G1 << " " << G1; ^