最开始可能是数组开小了，改为100010后就成编译失败了，这是为何

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

const int MAXN=100010;

int n, m;
vector<int> adj[MAXN];  // 邻接表，存储每个节点的邻接节点
int matrix[MAXN][MAXN]; // 邻接矩阵

int main() {
    cin >> n >> m;
    
    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= n; ++j) {
            matrix[i][j] = 0;
        }
    }
    
    for (int i = 0; i < m; ++i) {
        int u, v;
        cin >> u >> v;
        
        matrix[u][v] = 1;
        matrix[v][u] = 1;
        
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    
    // 输出邻接矩阵
    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= n; ++j) {
            cout << matrix[i][j] << " ";
        }
        cout << endl;
    }
    
    // 输出邻接表
    for (int i = 1; i <= n; ++i) {
        sort(adj[i].begin(), adj[i].end());
        cout << adj[i].size();
        for (int v : adj[i]) {
            cout << " " << v;
        }
        cout << endl;
    }
    
    return 0;
}