PARE2:

#include <iostream>
#include <vector>
#include <cmath>
using namespace std;

int main(){
    int n;
    bool trobat, parell, senar;
    while(cin >> n){
        trobat = parell = senar = false;
        vector <int> v(n);
        for(int i = 0; i < n; ++i) cin >> v[i];
        for(int i = 0; i < n and not trobat; ++i){
            if(v [i] % 2 == 0) parell = true;
            else senar = true;
            if(parell and senar) trobat = true;
        }
        if(trobat) cout << "si" << endl;
        else cout << "no" << endl;
    }
}

ISBN

#include <iostream>
#include <vector>
using namespace std;

int main(){
    int suma, mul;
    char num;
    vector <char> v(10);
    while(cin >> v[0]){
        suma = 0;
        for(int i = 1; i < 10; ++i) cin >> v[i];
        for(int i = 0; i < 10; ++i){
            if(v [i] == '?') mul = 10 - i;
            else if (v [i] == 'X') suma += 10;
            else suma += (v[i] - '0') * (10 - i);
        }
        bool trobat = false;
        for(int i = 0; i < 10 and not trobat; ++i){
            if((suma + (i * mul)) % 11 == 0){
                num = i + '0';
                trobat = true;
            }
        }
        if(not trobat) cout << "X" << endl;
        else cout << num << endl;
    }
}

PATXI:

#include <iostream>
#include <vector>
using namespace std;
typedef vector<int> Fila;
typedef vector<Fila> Quadrat;

int avalua(const vector <int> &p, int x){
    int n = p.size();
    int res = 0;
    int factor = 1;
    for(int i = 0; i < n; ++i){
        res += p[i] * factor;
        factor *= x;
    }
    return res;
}

MAPAR:

#include <iostream>
#include <vector>
#include <string>
using namespace std;
typedef vector<string> Fila;
typedef vector<Fila> Matriu;

int nombre_de_paraules(const Matriu& m, char c, int k){
    int total = 0;
    int f = m.size();
    for(int i = 0; i < f; ++i){
        int cc = m[i].size();
        for(int j = 0; j < cc; ++j){
            if(k < m[i][j].size() and m[i][j][k] == c) ++total;
        }
    }
    return total;
}