题解

#include<iostream>
#include<vector>
#define matrix(type) std::vector<std::vector<type>>
using namespace std;

int getrow(matrix(int) mat){return mat.size();};
int getcol(matrix(int) mat){return mat.front().size();}
matrix(int) rotate(matrix(int) mat){
    matrix(int) result;
    for (int i=0;i<getcol(mat);++i){
        vector<int> pushed;
        for (int j=0;j<getrow(mat);++j){
            pushed.push_back(mat[j][i]);
        }
        result.push_back(pushed);
    }
    return result;
}
int main(){
    matrix(int) arr,res;
    int n,m,k;
    cin>>n>>m>>k;
    for (int i=1;i<=n;i++){
        vector<int> vec;
        for (int j=1;j<=m;j++){
            int ele;
            cin>>ele;
            vec.push_back(ele);
        }
        arr.push_back(vec);
    }
    res=rotate(arr);
    for (int i:res[k-1]) cout<<i<<endl;
    return 0;
}