Compilare: user.cpp: In function ‘int main()’: user.cpp:9:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,st,dr,g; ^ user.cpp:9:13: warning: unused variable ‘st’ [-Wunused-variable] int i,j,st,dr,g; ^ user.cpp:9:16: warning: unused variable ‘dr’ [-Wunused-variable] int i,j,st,dr,g; ^ user.cpp:9:19: warning: unused variable ‘g’ [-Wunused-variable] int i,j,st,dr,g; ^ user.cpp:10:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("curcubeu.in","r",stdin); ^ user.cpp:11:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("curcubeu.out","w",stdout); ^ user.cpp:12:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&a,&b,&c); ^