problema

#include <iostream>
#include <fstream>
#include <string.h>>

using namespace std;
ifstream f("date.in");
int main()
{
    struct elev{char nume[256];float media;int varsta;} c[100];
    int n,aux,ok=0,nr=0;
    f>>n;
    for(int i=0;i<n;i++){
        f.get();
        f.get(c[i].nume,256);
        f>>c[i].varsta>>c[i].media;
    }
    //a)
    for(int i=0;i<n;i++){
        if(strcmp(c[i].nume,"Mihai")==0){
                cout<<endl<<"am gasit un mihai "<<endl;
            ok++;
            aux=i;
        }
    }
    if(ok==1) {
            cout<<endl<<"media lui mihai este "<<c[aux].media;

            }
    else if(ok==0){
            n++;
        for(int i=n-1;i>=0;i--){
           c[i]=c[i-1];}
        strcpy(c[0].nume,"Mihai");
        cin>>c[0].varsta>>c[0].media;

    }else{
        cout<<endl<<"Prea multi Mihai";
    }



    cout<<endl;
    for(int i=0;i<n;i++){
        cout<<c[i].nume<<" ";
    }
    cout<<endl;
    //b)
    for(int i=0;i<n;i++){
        if(c[i].media<5){
                nr++;
            for(int j=i;j<n;j++)
                c[j]=c[j+1];
            n--;
        }

    }
    if(nr>0)
    for(int i=0;i<n;i++){
        cout<<c[i].nume<<" ";
    }
    else
        cout<<"Nu e niciun elev corigent";
    cout<<endl;
    //c)
    for(int i=0;i<n;i++){
        if(c[i].varsta==14&&strchr(c[i].nume,'i'))
            cout<<c[i].nume;
    }
    return 0;
}