cf 20a BerOS file system

#include <iostream>#include <cstdio>using namespace std;int main(){    string s;    cin>>s;    bool flag=false;    int p=s.length()-1;    while(s[p]=='/')        p--;    if(p==-1)        s="/";    else        s=s.substr(0,p+1);    int i=0;    while(i!=s.length())    {        if(!flag)            cout<<s[i];        else        {            if(s[i]!='/')            {                cout<<s[i];                flag=false;            }        }        if(s[i]=='/')            flag=true;        else            flag=false;        i++;    }    printf("\n");}