Compilare: user.cpp: In function ‘int main()’: user.cpp:181:7: warning: unused variable ‘ty’ [-Wunused-variable] int ty; ^ user.cpp:172:12: warning: unused variable ‘j’ [-Wunused-variable] int i,n,k,j,q,x,y; ^ user.cpp:175:6: warning: unused variable ‘v’ [-Wunused-variable] int v; ^ user.cpp:170:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rev.in", "r", stdin); ^ user.cpp:171:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rev.out", "w", stdout); ^