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python/TangDou/AcWing/DisjointSet/240_KZY.cpp

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2025-08-30 18:35:01 +08:00
#include <bits/stdc++.h>
using namespace std;
const int N = 150010;
int p[N];
int ans;
int find(int x) {
if (p[x] != x) p[x] = find(p[x]);
return p[x];
}
void join(int x, int y) {
int f1 = find(x), f2 = find(y);
if (f1 != f2) p[f1] = f2;
}
int main() {
int n, m;
cin >> n >> m;
for (int i = 1; i <= 3 * n; i++) p[i] = i; // 并查集初始化
while (m--) {
int x, y, t;
cin >> t >> x >> y;
// 说出大于n编号的动物,肯定是假话
if (x > n || y > n) {
ans++;
continue;
}
if (t == 1) { // x和y同类
if (find(x + n) == find(y) || find(x + 2 * n) == find(y)) {
ans++;
continue;
}
join(x, y);
join(x + n, y + n);
join(x + 2 * n, y + 2 * n);
}
if (t == 2) { // x吃y
// +n 天敌,+2n 食物
if (find(x) == find(y) || find(x + n) == find(y)) {
ans++;
continue;
}
join(x, y + n);
join(x + n, y + 2 * n);
join(x + 2 * n, y);
}
}
printf("%d\n", ans);
return 0;
}