직사각형 회전 뒤 합계

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

int solution(vector<vector<int>> board, int turns) {
    for (int t = 0; t < turns; ++t) {
        int rows = (int)board.size();
        int cols = (int)board[0].size();
        vector<vector<int>> next(cols, vector<int>(rows));
        for (int r = 0; r < rows; ++r) {
            for (int c = 0; c < cols; ++c) {
                next[c][r] = board[r][c];
            }
        }
        board = next;
    }
    int sum = 0;
    int cols = (int)board[0].size();
    for (int r = 0; r < (int)board.size(); ++r)
        for (int c = 0; c < cols; ++c)
            sum += board[r][c] * (r * cols + c + 1);
    return sum;
}
int main() {
    int rows, cols, turns;
    cin >> rows >> cols >> turns;
    vector<vector<int>> board(rows, vector<int>(cols));
    for (int r = 0; r < rows; ++r)
        for (int c = 0; c < cols; ++c) cin >> board[r][c];
    cout << solution(board, turns) << '\n';
}