Compilare: user.cpp: In function ‘void addA(int, int)’: user.cpp:59:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!t->f[a]) ^ user.cpp:60:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] t->f[a] = new trie; ^ user.cpp:62:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(t->f[a]) ^ user.cpp:63:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] t = t->f[a]; ^ user.cpp: In function ‘void addB(int)’: user.cpp:81:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(t->f[a]) ^ user.cpp:82:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] t = t->f[a]; ^ user.cpp: In function ‘int main()’: user.cpp:101:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sub.in", "r", stdin); ^ user.cpp:102:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sub.out", "w", stdout); ^ user.cpp:104:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:107:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^ user.cpp:114:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &m); ^ user.cpp:117:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^