测试数据生成器——树

#include<bits/stdc++.h>using namespace std;int t;int n, m;int a, b, c, d;int random1(int mod) {    if(mod == 0)return 1;    return (rand() + 1) % mod + 1;}int main() {    freopen("input.txt", "w", stdout);    srand(time(NULL));    t = 10;    printf("%d\n", t);    for(int i = 0; i < t; ++i) {        n = random1(20);        printf("%d\n", n);        for(int k = 2; k <= n; ++k)printf("%d %d\n", random1(k - 1), k);        printf("\n");    }}