Compilare: user.cpp: In function ‘void df(int)’: user.cpp:74:13: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int l,i,ok=0; l=v[x].size(); ^ user.cpp: In function ‘int sum(int)’: user.cpp:86:13: warning: unused variable ‘ok’ [-Wunused-variable] int l,i,ok=0; l=v[x].size(); S[x]=0; ^ user.cpp: In function ‘void citire()’: user.cpp:13:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&k); ^ user.cpp:16:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^ user.cpp: In function ‘int main()’: user.cpp:97:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.in","r",stdin); ^ user.cpp:98:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.out","w",stdout); ^