Compilare: main.cpp: In function 'int main()': main.cpp:66:23: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[21]' [-Wformat=] scanf ("%s",&c); ^ main.cpp:60:34: 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); ^ main.cpp:61:36: 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); ^ main.cpp:65:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf (" "); ^ main.cpp:66:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%s",&c); ^ main.cpp:67:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("\n"); ^