Compilare: user.cpp: In function ‘int main()’: user.cpp:9:17: warning: unused variable ‘u’ [-Wunused-variable] int n,i,j,m,u,q,w,m1,m2,i1,i2,l,x; ^ user.cpp:9:19: warning: unused variable ‘q’ [-Wunused-variable] int n,i,j,m,u,q,w,m1,m2,i1,i2,l,x; ^ user.cpp:9:21: warning: unused variable ‘w’ [-Wunused-variable] int n,i,j,m,u,q,w,m1,m2,i1,i2,l,x; ^ user.cpp:9:32: warning: variable ‘i2’ set but not used [-Wunused-but-set-variable] int n,i,j,m,u,q,w,m1,m2,i1,i2,l,x; ^ user.cpp:7:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lacusta.in","r",stdin); ^ user.cpp:8:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lacusta.out","w",stdout); ^ user.cpp:10:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&n,&m); ^ user.cpp:14:23: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(si+1); ^ /tmp/cc2IqukH.o: In function `main': user.cpp:(.text.startup+0x8c): warning: the `gets' function is dangerous and should not be used.