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| // Problem: P5787 二分图 /【模板】线段树分治
// Contest: Luogu
// URL: https://www.luogu.com.cn/problem/P5787
// Memory Limit: 256 MB
// Time Limit: 1000 ms
// Author: Ybw051114
//
// Powered by CP Editor (https://cpeditor.org)
#include "ybwhead/ios.h"
const int maxn = 1e6 + 10;
struct node
{
int a, b;
};
vector<node> q[maxn];
void add(int p, int l, int r, int ll, int rr, node d)
{
if (l > rr || r < ll)
return;
if (ll <= l && r <= rr)
{
q[p].push_back(d);
return;
}
int mid = l + r >> 1;
if (ll <= mid)
add(p << 1, l, mid, ll, rr, d);
if (rr > mid)
add(p << 1 | 1, mid + 1, r, ll, rr, d);
}
int n, m, k;
int top, s1[maxn], s2[maxn];
int f[maxn], siz[maxn];
int find(int x)
{
if (f[x] == x)
return x;
return find(f[x]);
}
void merge(int x, int y)
{
x = find(x), y = find(y);
if (x == y)
return;
if (siz[x] > siz[y])
{
swap(x, y);
}
s1[++top] = x;
s2[top] = y;
f[x] = y;
siz[y] += siz[x];
return;
}
void solve(int p, int l, int r)
{
bool flg = 1;
int tmp = top;
for (auto x : q[p])
{
int a = find(x.a);
int b = find(x.b);
// yout << a << " " << b << endl;
if (a == b)
{
for (int k = l; k <= r; k++)
puts("No");
flg = 0;
break;
}
merge(x.a, x.b + n);
merge(x.a + n, x.b);
}
if (flg)
{
if (l == r)
{
puts("Yes");
}
else
{
int mid = l + r >> 1;
solve(p << 1, l, mid);
solve(p << 1 | 1, mid + 1, r);
}
}
while (top > tmp)
{
siz[s2[top]] -= siz[s1[top]];
f[s1[top]] = s1[top];
top--;
}
return;
}
int main()
{
yin >> n >> m >> k;
for (int i = 1; i <= m; i++)
{
int l, r, a, b;
yin >> a >> b >> l >> r;
++l;
// ++r;
node v = (node){a, b};
add(1, 1, k, l, r, v);
}
for (int i = 1; i <= 2 * n; i++)
f[i] = i, siz[i] = 1;
solve(1, 1, k);
return 0;
}
|