Compilare: user.cpp: In function ‘int main()’: user.cpp:87:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1; i < suf.size(); ++ i) ^ user.cpp:43:18: warning: unused variable ‘j’ [-Wunused-variable] int x, y, i, j, len; ^ user.cpp:41:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ghicit.in", "r", stdin); ^ user.cpp:42:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ghicit.out", "w", stdout); ^ user.cpp:45:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(a); ^ /tmp/cc18mjdD.o: In function `main': user.cpp:(.text.startup+0x56): warning: the `gets' function is dangerous and should not be used.