# Three-View Projection## 题目描述 全文与 $x y z$ 轴方向有关的内容均基于以下的 $x y z$ 轴、位置及观测方向。观测者站在如图所示的位置正在向着 $y$ 周绿线正方向箭头方向观测。 !httpscdnluogucomcnuploadimage_hosting05erek0jpng现在在地面上有一个长、宽沿 $x y$ 轴延展的长度为 $n text cm

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

int main() {
    int n, m;
    cin >> n >> m;
    vector<vector<int>> grid(n, vector<int>(m));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cin >> grid[i][j];
        }
    }

    // 正视图
    vector<int> front_view(n);
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (grid[i][j] == 1) {
                front_view[i] = 1;
                break;
            }
        }
    }

    // 左视图
    vector<int> left_view(m);
    for (int j = 0; j < m; j++) {
        for (int i = 0; i < n; i++) {
            if (grid[i][j] == 1) {
                left_view[j] = 1;
                break;
            }
        }
    }

    // 俯视图
    vector<vector<int>> top_view(m, vector<int>(n));
    for (int j = 0; j < m; j++) {
        for (int i = 0; i < n; i++) {
            top_view[j][i] = grid[i][j];
        }
    }

    // 输出结果
    for (int i = 0; i < n; i++) {
        cout << front_view[i] << " ";
    }
    cout << endl;
    for (int j = 0; j < m; j++) {
        cout << left_view[j] << " ";
    }
    cout << endl;
    for (int j = 0; j < m; j++) {
        for (int i = 0; i < n; i++) {
            cout << top_view[j][i] << " ";
        }
        cout << endl;
    }

    return 0;
}
``