Compilare: user.cpp: In function ‘int main()’: user.cpp:126:9: warning: unused variable ‘i’ [-Wunused-variable] int i, ans, ans1, ans2; ^ user.cpp:126:17: warning: unused variable ‘ans1’ [-Wunused-variable] int i, ans, ans1, ans2; ^ user.cpp:126:23: warning: unused variable ‘ans2’ [-Wunused-variable] int i, ans, ans1, ans2; ^ user.cpp:128:55: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("infinitepatternmatching.in", "r", stdin); ^ user.cpp:129:57: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("infinitepatternmatching.out", "w", stdout); ^ user.cpp:131:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%s", b); ^