Compilare: user.cpp: In function ‘void read()’: user.cpp:13:22: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[20005]’ [-Wformat=] scanf("%s\n", &s1); ^ user.cpp:14:22: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[20005]’ [-Wformat=] scanf("%s\n", &s2); ^ user.cpp:12:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d\n", &n, &m, &k); ^ user.cpp:13:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", &s1); ^ user.cpp:14:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", &s2); ^ user.cpp: In function ‘int main()’: user.cpp:41:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("edist.in", "r", stdin); ^