Compilare: user.cpp: In function ‘int main()’: user.cpp:61:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (!trie[state][w[cuv][i]]) ^ user.cpp:64:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] trie[state][w[cuv][i]] = nstates; ^ user.cpp:67:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] state = trie[state][w[cuv][i]]; ^ user.cpp:92:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] state = trie[state][s[j]]; ^ user.cpp:20:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("abc2.in", "r", stdin); ^ user.cpp:23:27: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, LMAX - 1, stdin); ^ user.cpp:32:32: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(w[N], WLMAX - 1, stdin); ^ user.cpp:102:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("abc2.out", "w", stdout); ^