Compilare: user.cpp: In function ‘int main()’: user.cpp:23:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[s[i]] ++; ^ user.cpp:39:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (i - f2[s[i]] <= 0) ^ user.cpp:42:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[i].st = i - f2[s[i]]; ^ user.cpp:43:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (i + f2[s[i]] >= n) ^ user.cpp:46:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[i].dr = i + f2[s[i]]; ^ user.cpp:17:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("char.in", "r", stdin); ^ user.cpp:18:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("char.out", "w", stdout); ^ user.cpp:20:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &n); ^ user.cpp:21:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp:25:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &m); ^ user.cpp:30:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[j]); ^ /tmp/ccYUyPV9.o: In function `main': user.cpp:(.text.startup+0x6a): warning: the `gets' function is dangerous and should not be used.