Compilare: user.cpp: In function ‘void del(int, int, int)’: user.cpp:20:61: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[begin][ord] == a[i][ord] && ord < a[begin].length()-1){ ^ user.cpp: In function ‘int main()’: user.cpp:36:17: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[101]’ [-Wformat=] scanf("%s", &c); ^ user.cpp:32:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dictree.in", "r", stdin); ^ user.cpp:33:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dictree.out", "w", stdout); ^ user.cpp:34:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:36:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", &c); ^