Compilare: user.cpp: In function ‘int main()’: user.cpp:53:34: warning: format ‘%s’ expects argument of type ‘char*’, but argument 4 has type ‘char (*)[1000010]’ [-Wformat=] scanf("%lld%lld\n%s",&a,&b,&s); ^ user.cpp:79:20: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long int’ [-Wformat=] printf("%d",sum); ^ user.cpp:52:10: warning: unused variable ‘ch’ [-Wunused-variable] char ch; ^ user.cpp:48:33: 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:49:35: 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:53:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld\n%s",&a,&b,&s); ^