Compilare: user.cpp: In function ‘int main()’: user.cpp:79:10: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] s2[p]=NULL; ^ user.cpp:39:9: warning: unused variable ‘n’ [-Wunused-variable] int n,l,i=0,j,x,p,ok=0,k,y,minim,nrminim; ^ user.cpp:37:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dist.in","r",stdin); ^ user.cpp:38:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dist.out","w",stdout); ^ user.cpp:40:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp:56:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccn0Mcjd.o: In function `main': user.cpp:(.text.startup+0x56): warning: the `gets' function is dangerous and should not be used.