Compilare: user.cpp: In function ‘void Read()’: user.cpp:30:9: warning: unused variable ‘a’ [-Wunused-variable] int a,b; ^ user.cpp:30:11: warning: unused variable ‘b’ [-Wunused-variable] int a,b; ^ user.cpp:29:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&N,&K); ^ user.cpp:33:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&pctX[i],&pctY[i]); ^ user.cpp: In function ‘int main()’: user.cpp:173:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("naveplanare.in","r",stdin); ^ user.cpp:174:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("naveplanare.out","w",stdout); ^