Compilare: user.cpp: In function ‘int main()’: user.cpp:100:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:103:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&x); ^ user.cpp: In function ‘void perechi()’: user.cpp:93:33: warning: ‘r2’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<(sol+1)/2<<" "<<r1<<" "<<r2<<'\n'; ^ user.cpp:93:24: warning: ‘r1’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<(sol+1)/2<<" "<<r1<<" "<<r2<<'\n'; ^