Compilare: user.cpp: In function ‘void Read()’: user.cpp:42:9: warning: unused variable ‘a’ [-Wunused-variable] int a,b,c; ^ user.cpp:42:11: warning: unused variable ‘b’ [-Wunused-variable] int a,b,c; ^ user.cpp:42:13: warning: unused variable ‘c’ [-Wunused-variable] int a,b,c; ^ user.cpp:40:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:44:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&P[i].x,&P[i].y,&P[i].c); ^ user.cpp: In function ‘int main()’: user.cpp:70:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("polig.in","r",stdin); ^ user.cpp:71:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("polig.out","w",stdout); ^