Interesting number

input/code.cpp: In function 'int main()':
input/code.cpp:39:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for(int j = 0; j < v.size(); ++j) {
                                           ^

#include<bits/stdc++.h>
 
using namespace std;
int q[1111];
 
int main(void) {
    cin.tie(0);
    ios_base::sync_with_stdio(false);
    cout << fixed << setprecision(12);
    q[1] = 1;
    for(int i = 2; i < 1111; ++i) {
        if(!q[i]) {
            for(int j = i*2; j < 1111; j += i) {
                q[j] = 1;
            }
        }
    }
    /*
    for(int i = 0; i < 100; ++i) {
        if(!q[i]) cout<<i<<' ';
    }
    cout<<'\n';
    */
    int t;
    cin>>t;
    for(int xx = 0; xx < t; ++xx) {
        int n;
        cin>>n;
        for(int i = 0; i < n; ++i) {
            int w;
            cin>>w;
            int ww = w;
            if(q[w] == 0) {
                vector<int> v;
                while(w) {
                    v.push_back(w%10);
                    w/=10;
                }
                for(int j = 0; j < v.size(); ++j) {
                    if(v[j] != v[v.size()-j-1]) goto ohi;
                }
                cout<<ww<<'\n';
            }
ohi:;
        }
    }
 
 
    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED