Compilare: user.cpp: In constructor ‘trie::trie()’: user.cpp:12:34: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(t, NULL, sizeof(t)); ^ user.cpp: In function ‘int test()’: user.cpp:39:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(X[w[1]].size() <= l + r) continue; ^ user.cpp:41:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(X[w[j]].size() <= l + r || X[w[j]][l + r] != X[w[1]][l + r]) ^ user.cpp: In function ‘int main()’: user.cpp:63:23: warning: unused variable ‘l’ [-Wunused-variable] int r = 2005, l = 0, mid, ret = 0; ^ user.cpp:63:30: warning: unused variable ‘mid’ [-Wunused-variable] int r = 2005, l = 0, mid, ret = 0; ^ user.cpp:63:35: warning: unused variable ‘ret’ [-Wunused-variable] int r = 2005, l = 0, mid, ret = 0; ^