Compilare: user.cpp: In function ‘short int read()’: user.cpp:10:18: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[30]’ [-Wformat=] scanf("%s",&c); ^ user.cpp: In function ‘int main()’: user.cpp:23:72: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘short int*’ [-Wformat=] for (rshort i=1,x;i<=n;++i) for (rshort j=1;j<=m;++j) scanf("%d",&x),v[i][x]=1,Nmax=max(Nmax,x); ^ user.cpp:18:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("flori.in","r",stdin); ^ user.cpp:19:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("flori.out","w",stdout); ^ user.cpp:20:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:23:100: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (rshort i=1,x;i<=n;++i) for (rshort j=1;j<=m;++j) scanf("%d",&x),v[i][x]=1,Nmax=max(Nmax,x); ^