Compilare: user.cpp: In function ‘int main()’: user.cpp:44:23: warning: NULL used in arithmetic [-Wpointer-arith] for(i=1;s[i]!=NULL;++i){ ^ user.cpp:51:29: warning: NULL used in arithmetic [-Wpointer-arith] for(j=i+1;s[j]!=NULL;++j) if(d[j]>d[i]+(j-i)) d[j]=d[i]+(j-i); ^ user.cpp:24:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("carte.in","r",stdin); ^ user.cpp:25:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("carte.out","w",stdout); ^