tema 10.10.2018

#include <iostream>

using namespace std;

int main()
{
    int pb; cout<<"Introdu nr problemei:"<<endl; cin>>pb;
    switch(pb){
        case 1:{//var 70
            int x, y,z;
            cout<<"x="; cin>>x;
            cout<<"y="; cin>>y;
            cout<<"z="; cin>>z;
            int v[x][y];
            cout<<"Introdu elemntele matricei:"<<endl;
            for (int i=0; i<x; i++){
                for (int j=0; j<y; j++)
                    cin>>v[i][j];
            }
            for (int i=0; i<x; i++){
                for (int j=0; j<y; j++){
                    if (i==z)
                        v[i][j]=v[i+1][j];
                }
            }
            cout<<"Matricea formata este:"<<endl;
            for (int i=0; i<x-1; i++){
                for (int j=0; j<y; j++)
                    cout<<v[i][j]<<" ";
                cout<<endl;
            }
            break;
        }
        case 2:{//var 72
            int n; cout<<"n="; cin>>n;
            int k=1;
            int v[n][n];//simetrica fata de diag sec
            for (int i = 0; i < n; i++)
                for (int j = 0; j <= i; j++) {
                v[i - j][j] = k;
                v[n - 1 - j][n - 1 - i + j] = k;
                k++;
            }
            cout<<"Matricea formata este:"<<endl;
            for (int i=0; i<n; i++){
                for (int j=0; j<n; j++)
                    cout<<v[i][j]<<" ";
                cout<<endl;
            }
            break;
        }

        case 3:{//var 75
            int n; cout<<"n="; cin>>n;
            int v[n][n];
            for (int i=1; i<=n; i++){
                for (int j=1; j<=n; j++)
                    v[i][j]=(i+j)*(i+j);
            }
            cout<<"Matricea este:"<<endl;
            for (int i=1; i<=n; i++){
                for (int j=1; j<=n; j++)
                    cout<<v[i][j]<<" ";
                cout<<endl;
            }
            break;
        }
        case 4:{//var 82
            int n; cout<<"n="; cin>>n;
            int m; cout<<"m="; cin>>m;
            int k; cout<<"k="; cin>>k;
            int v[n][m];
            cout<<"Introdu elementele matricii:"<<endl;
            for (int i=1; i<=n; i++){
                for (int j=1; j<=m; j++)
                    cin>>v[i][j];
            }
            int p=1;
            for (int i=1; i<=m; i++){
                for (int j=1; j<=n; j++){
                    if (v[j][i]==k){
                        p*=i;
                        cout<<i<<" si ";
                        break;
                    }
                }
            }
            if (p>1)
                cout<<"Produsul este "<<p<<endl;
            else
                cout<<"Nu exista!"<<endl;
            break;
        }
    }
    return 0;
}