Compilare: user.cpp: In function ‘int main()’: user.cpp:24:38: warning: format ‘%s’ expects argument of type ‘char*’, but argument 4 has type ‘char (*)[10000000]’ [-Wformat=] scanf ("%lld %lld %s", &a, &b, &s); ^ user.cpp:22:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("jstc.in", "r", stdin); ^ user.cpp:23:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("jstc.out", "w", stdout); ^ user.cpp:24:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%lld %lld %s", &a, &b, &s); ^