Compilare: user.cpp: In function ‘int main()’: user.cpp:29:16: warning: variable ‘b’ set but not used [-Wunused-but-set-variable] int i, j,a,b,ra,rb,i1,i2; ^ user.cpp:29:18: warning: variable ‘ra’ set but not used [-Wunused-but-set-variable] int i, j,a,b,ra,rb,i1,i2; ^ user.cpp:29:21: warning: variable ‘rb’ set but not used [-Wunused-but-set-variable] int i, j,a,b,ra,rb,i1,i2; ^ user.cpp:29:24: warning: unused variable ‘i1’ [-Wunused-variable] int i, j,a,b,ra,rb,i1,i2; ^ user.cpp:29:27: warning: unused variable ‘i2’ [-Wunused-variable] int i, j,a,b,ra,rb,i1,i2; ^ user.cpp:27:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nks.in","r",stdin); ^ user.cpp:28:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nks.out","w",stdout); ^ user.cpp:30:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d", &n, &m, &p,&q,&s); ^