Compilare: user.cpp: In function ‘int main()’: user.cpp:71:27: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[2000005]’ [-Wformat=] scanf("%s\n", &pattern); ^ user.cpp:72:21: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[2000005]’ [-Wformat=] scanf("%s", &str); ^ user.cpp:68:39: 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:69:41: 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:71:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", &pattern); ^ user.cpp:72:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", &str); ^