Compilare: user.cpp: In function ‘int main()’: user.cpp:37:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[c[u]].size();i++) ^ user.cpp:60:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[c[u]].size();i++) ^ user.cpp:15:13: warning: unused variable ‘x’ [-Wunused-variable] int u,p,i,n,x,m,a,b,j,d,last; ^ user.cpp:57:17: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] cont[last]=1; ^ user.cpp:74:8: warning: ‘d’ may be used uninitialized in this function [-Wmaybe-uninitialized] out<<d-1<<'\n'; ^ In file included from /usr/include/string.h:642:0, from /usr/include/c++/4.8/cstring:42, from user.cpp:3: In function ‘void* memset(void*, int, size_t)’, inlined from ‘int main()’ at user.cpp:52:27: /usr/include/i386-linux-gnu/bits/string3.h:85:70: warning: call to void* __builtin___memset_chk(void*, int, unsigned int, unsigned int) will always overflow destination buffer [enabled by default] return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest)); ^ In function ‘void* memset(void*, int, size_t)’, inlined from ‘int main()’ at user.cpp:53:26: /usr/include/i386-linux-gnu/bits/string3.h:85:70: warning: call to void* __builtin___memset_chk(void*, int, unsigned int, unsigned int) will always overflow destination buffer [enabled by default] return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest)); ^