Tema 11.10.2018

#include <iostream>

using namespace std;

int main()
{
    // Probleme propuse (aprox. pag. 90), problemele: 1, 2, 5, 6, 7, 8, 9, 10, 11, 12.
    int pb ; cout<<"Nr pb.:"; cin>>pb;
    switch(pb){
        case 1:{//pb 1
            int n; cout<<"n="; cin>>n;
            int v[n];
            cout<<"Introdu notele:"<<endl;
            float notemici=0, ma5, note7=0, notamare=INT_MIN, s=0;;
            int k=0;
            for (int i=0; i<n; i++) {
                cin>>v[i];
                if (v[i]<5) notemici++;
                if (v[i]==7) note7++;
                if (v[i]>notamare) notamare=v[i];
                if (v[i]>5) {s+=v[i]; k++;}
            }
            if (k) ma5= s / k*1.0;
            cout<<"Cea mai mare nota este :"<<notamare<<endl;
            cout<<"exista "<<notemici<<" note mai mici decat 5"<<endl;
            cout<<"Exista "<<note7<<" note de 7"<<endl;
            cout<<"Media aritmetica a  notelor peste 5 este: "<<ma5;
        break;
        }
        case 2:{//pb 2
            int n; cout<<"n="; cin>>n;
            cout<<"Introdu nr:"<<endl;
            int v[n];
            for (int i=0; i<n; i++) cin>>v[i];
            int nmax=INT_MIN, ind=0;
            for (int i=0; i<n; i++){
                if (nmax==v[i]) ind++;
                if (v[i]>nmax){
                    nmax=v[i];
                    ind=1;
                }
            }
              cout<<"Nr maxim este "<<nmax<<" si apare de "<<ind<<" ori"<<endl;
              break;
        }
        case 3:{//pb 5
            int n; cout<<"n="; cin>>n;
            int v[n], s=0;
            cout<<"Introdu nr:"<<endl;
            for (int i=0; i<n; i++){
                cin>>v[i];
                if ((i%2)!=0 && (v[i]%2)==0) s+=v[i];
            }
            cout<<"Suma este: "<<s<<endl;
            break;
        }
        case 4:{//pb 6
            int n; cout<<"n="; cin>>n;
            int v[n], s1=0, s2=0, p=1;
            cout<<"Introdu nr:"<<endl;
            for (int i=0; i<n; i++){
                cin>>v[i];
                s1=s1*10+v[i];
                s2=s2+v[i]*p;
                p*=10;
            }
            cout<<"Suma este "<<s1+s2;
            break;
        }
        case 5:{//pb 7
            int n; cout<<"n="; cin>>n;
            int v[n], s=0, k=0;
            cout<<"Introdu nr:"<<endl;
            for (int i=0; i<n; i++){
                cin>>v[i];
                if (v[i]) {s+=v[i]; k++;}
            }
            for (int i=0; i<n; i++)
                if (!v[i]) v[i]=s/k;
            cout<<"Vectorul format este:"<<endl;
            for (int i=0; i<n; i++) cout<<v[i]<<" ";
            break;
        }
        case 6:{//pb 8
            int n; cout <<"n="; cin>>n;
            int v[n], a[2*n];
            cout<<"Citeste vectorul:"<<endl;
            for (int i=0, j=0; i<n; i++){
                cin>>v[i];
                a[j++]=v[i];
                a[j++]=0;
            }
            cout<<"Vectorul format este :"<<endl;
            for (int i=0; i<2*n; i++) cout<<a[i]<<" ";
            break;
        }
        case 7:{//pb 9
            int n; cout<<"n="; cin>>n;
            float v[n];
            cout<<"Citeste vectorul:"<<endl;
            for (int i=0; i<n; i++) cin>>v[i];
            cout<<"Perechile sunt:"<<endl;
            for (int i=0; i<n/2; i++) if (int(v[i])==int(v[n-i-1])) cout<<v[i]<<" si "<<v[n-i-1]<<endl;
            break;
        }
        case 8:{//pb 10
            int n; cout<<"n="; cin>>n;
            int v[n];
            cout<<"Introdu elementele vectorului:"<<endl;
            for (int i=0; i<n; i++) cin>>v[i];
            for (int i=0; i<n-1; i++){
                int nmax=INT_MIN;
                int ind=-1;
                for (int j=i; j<n; j++){
                    if (v[j]>nmax){
                        nmax=v[j];
                        ind=j;
                    }
                }
                if (v[i])
                    swap (v[i], v[ind]);
            }
            cout<<"Vectorul sortat este:"<<endl;
            for (int i=0; i<n; i++) cout<<v[i]<<" ";
            break;
        }
        case 9:{//pb 11
            int n; cout<<"n="; cin>>n;
            int v[n];
            cout<<"Introdu elementele vectorului:"<<endl;
            for (int i=0; i<n; i++) cin>>v[i];
            int del=v[0];
            for (int i=0; i<n; i++){
                if (v[i]==del){
                    --n;
                    for (int j=i; j<n; j++){
                        v[j]=v[j+1];
                    }
                }
            }
            cout<<"Vectorul nou este:"<<endl;
            for (int i=0; i<n; i++) cout<<v[i]<<" ";
            break;
        }
          case 10:{
            int n; cout<<"n="; cin>>n;
            char v[n];
            cout<<"Introdu elementele vecrorului:"<<endl;
            for (int i=0; i<n; i++)  cin>>v[i];
            char cmax; int kmax=INT_MIN;
            for (int i=0; i<n-1; i++){
                int k=1;
                for (int j=i+1; j<n; j++){
                    if (v[i]==v[j])
                        k++;
                }
            if (k>kmax){
                cmax=v[i];
                kmax=k;
            }
            }
            cout<<"Caracterul "<<cmax<<" apare de "<<kmax<<" ori"<<endl;
            break;
        }

    }
    return 0;
}