Compilare: user.cpp: In function ‘int main()’: user.cpp:12:9: warning: unused variable ‘n’ [-Wunused-variable] int n,m,i,j,l,ps,pd,x; ^ user.cpp:12:11: warning: unused variable ‘m’ [-Wunused-variable] int n,m,i,j,l,ps,pd,x; ^ user.cpp:10:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("revsecv.in","r",stdin); ^ user.cpp:11:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("revsecv.out","w",stdout); ^ user.cpp:14:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",si+1); ^