Compilare: user.cpp: In function ‘void read()’: user.cpp:42:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (t+1 < a.size() && q != '\n' && q != a[++t]) ^ user.cpp: In function ‘int main()’: user.cpp:21:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("strmatch.out", "w", stdout); ^ user.cpp: In function ‘void read()’: user.cpp:33:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in", "r", stdin); ^ user.cpp:36:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &q); ^ user.cpp:41:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &q); ^ user.cpp: In function ‘void write()’: user.cpp:83:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("strmatch.out", "w", stdout); ^