I also had used vector only but, i am getting segementation fault though, i dont know what is wrong!?

vector>s(n);

vector<int>m;
int lastAns=0;
for(int i=0;i<queries.size();i++){
    if(queries[i][0]==1){
        int re=(queries[i][1]^lastAns)%n;
        s[re].push_back(queries[i][2]);
    }
    else{
        int re=(queries[i][1]^lastAns)%n;
        lastAns=s[re][queries[i][2]];
        m.push_back(lastAns);
    }
}