Compilare: user.cpp: In function ‘int main()’: user.cpp:66:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v[lit-'a'].size(); ++j) ^ user.cpp:29:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("charlie.in","r",stdin); ^ user.cpp:30:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("charlie.out","w",stdout); ^ user.cpp:32:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &tip); ^ user.cpp:33:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(sir+1); n = strlen(sir+1); ^ user.cpp:53:45: warning: ‘mode’ may be used uninitialized in this function [-Wmaybe-uninitialized] maxx = max(maxx , i - start - (mode == -1)); ^ /tmp/ccWStNEl.o: In function `main': user.cpp:(.text.startup+0x6a): warning: the `gets' function is dangerous and should not be used.