Compilare: user.cpp: In function ‘void Write(int)’: user.cpp:13:12: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] s[i+1] = NULL; ^ user.cpp: In function ‘int main()’: user.cpp:28:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,t,s; ^ user.cpp:25:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxunice.in","r",stdin); ^ user.cpp:26:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxunice.out","w",stdout); ^ user.cpp:30:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^