Compilare: user.cpp: In function ‘int Nextint()’: user.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;i < strlen(S);i++) ^ user.cpp:14:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",S); ^ user.cpp: In function ‘int main()’: user.cpp:60:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("clepsidru.in","r",stdin); ^ user.cpp:61:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("clepsidru.out","w",stdout); ^ user.cpp:88:13: warning: ‘P’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (P == 1) ^