Compilare: user.cpp: In function ‘void solveproblem()’: user.cpp:34:13: warning: unused variable ‘b’ [-Wunused-variable] int i,a,b,c,d; ^ user.cpp:34:17: warning: unused variable ‘d’ [-Wunused-variable] int i,a,b,c,d; ^ user.cpp: In function ‘void readandprecalculate()’: user.cpp:24:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:26:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x[i],&y[i]); ^ user.cpp: In function ‘int main()’: user.cpp:49:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("popandai2.in","r",stdin); ^ user.cpp:50:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("popandai2.out","w",stdout); ^