Compilare: user.cpp: In function ‘bool f(int, int)’: user.cpp:9:9: warning: unused variable ‘st’ [-Wunused-variable] int st,dr,mid,sol,minim,maxim,step,j; ^ user.cpp:9:12: warning: unused variable ‘dr’ [-Wunused-variable] int st,dr,mid,sol,minim,maxim,step,j; ^ user.cpp:9:15: warning: unused variable ‘mid’ [-Wunused-variable] int st,dr,mid,sol,minim,maxim,step,j; ^ user.cpp: In function ‘int main()’: user.cpp:40:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dist2.in","r",stdin); ^ user.cpp:41:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dist2.out","w",stdout); ^ user.cpp:42:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:45:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].first,&v[i].second); ^