Compilare: main.cpp: In function 'int cb(int)': main.cpp:13:19: warning: overflow in implicit constant conversion [-Woverflow] int st = 0, dr =10000000000; ^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:26:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "fact.in", "r", stdin ); ^ main.cpp:27:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "fact.out", "w", stdout ); ^ main.cpp:29:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &n ); ^