test.c

// Online C++ compiler to run C++ program online
#include <cstdio>
#include <vector>
#include <inttypes.h>
#include <cstdbool>

using std::vector;

int_fast32_t prime(int_fast32_t num_k, vector<int_fast32_t> &arr);

int main()
{
    // Write C++ code here
    std::vector<int_fast32_t> pri= {2, 3, 5, 7};
    
    uint_fast16_t t;
    scanf("%" SCNuFAST16, &t);
    getchar();
    
    for (int i = 0; i < t; i++) {
        int_fast32_t k;
        scanf("%" SCNdFAST32, &k);
        getchar();
 
        k -= 1;       
        if (k > pri.size()) {
            prime(k, pri);
        }
        
        printf("%" PRIdFAST32 "\n", pri[k]);
    }

    return 0;
}

int_fast32_t prime(int_fast32_t num_k, vector<int_fast32_t> &arr)
{
        for (int_fast32_t member = arr[arr.size() - 1]; num_k >= arr.size(); member += 2) {
            bool yes = true;
        for (int_fast32_t n: arr) {
            if (!(member % n)) {
                bool yes = false;
            }
        }
        
        if (yes)
            arr.push_back(member);
    }
}