Compilare: user.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] #import<fstream> ^~~~~~ user.cpp:2:22: warning: multi-character character constant [-Wmultichar] int n,i=1,j,r;char p['썐'];main(){for(std::ifstream("ciur.in")>>n;i<n;)if(!p[j=++i])for(++r;n/(j+=i);p[j]=1);std::ofstream("ciur.out")<<r;} ^~~~~ user.cpp:2:34: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] int n,i=1,j,r;char p['썐'];main(){for(std::ifstream("ciur.in")>>n;i<n;)if(!p[j=++i])for(++r;n/(j+=i);p[j]=1);std::ofstream("ciur.out")<<r;} ^