Compilare: user.cpp: In function ‘int LongestPrefix(char*)’: user.cpp:43:9: warning: unused variable ‘len’ [-Wunused-variable] int len = strlen(word), index, prefix = 0; ^ user.cpp:43:29: warning: unused variable ‘index’ [-Wunused-variable] int len = strlen(word), index, prefix = 0; ^ user.cpp: In function ‘int main()’: user.cpp:109:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.in", "r", stdin); ^ user.cpp:110:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.out", "w", stdout); ^ user.cpp:119:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &task); ^ user.cpp:121:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", word); ^