#include <bits/stdc++.h>
#include <ios>
#define DEBUG(x) cout << #x << " = " << x << '\n';
using namespace std;
const int MAXQ = 1'000'000;
const int MAXN = 300'000;
const int MAXSZ = MAXQ + MAXN + 5;
int parent[MAXSZ], edges[MAXSZ], name[MAXSZ], sz[MAXSZ];
int n, q;
void init() {
for (int i = 1; i <= n; ++i)
parent[i] = i;
for (int i = 1; i <= n; ++i)
name[i] = i;
for (int i = 1; i <= n; ++i)
sz[i] = 1;
}
int _find(int x) {
if (parent[x] != x)
parent[x] = _find(parent[x]);
return parent[x];
}
int find(const int x) { return _find(name[x]); }
void onion(int x, int y) {
if (sz[x] < sz[y])
swap(x, y);
parent[y] = x;
sz[x] += sz[y];
edges[x] += edges[y] + 1;
}
void add_edge(int x, int y) {
x = find(x), y = find(y);
if (x != y)
onion(x, y);
else
++edges[x];
}
char query(int x) {
x = find(x);
if (edges[x] == sz[x])
return '1';
if (edges[x] == 0)
return '0';
return '?';
}
void split(const int x) {
const int r = find(x);
--edges[r], --sz[r];
name[x] = ++n;
sz[n] = 1;
parent[n] = n;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> q;
init();
for (int i = 0; i < q; ++i) {
char c;
int x, y;
cin >> c;
switch (c) {
case '?':
cin >> x;
cout << query(x);
break;
case '+':
cin >> x >> y;
add_edge(x, y);
break;
default:
cin >> x;
split(x);
}
}
cout << '\n';
}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 | #include <bits/stdc++.h> #include <ios> #define DEBUG(x) cout << #x << " = " << x << '\n'; using namespace std; const int MAXQ = 1'000'000; const int MAXN = 300'000; const int MAXSZ = MAXQ + MAXN + 5; int parent[MAXSZ], edges[MAXSZ], name[MAXSZ], sz[MAXSZ]; int n, q; void init() { for (int i = 1; i <= n; ++i) parent[i] = i; for (int i = 1; i <= n; ++i) name[i] = i; for (int i = 1; i <= n; ++i) sz[i] = 1; } int _find(int x) { if (parent[x] != x) parent[x] = _find(parent[x]); return parent[x]; } int find(const int x) { return _find(name[x]); } void onion(int x, int y) { if (sz[x] < sz[y]) swap(x, y); parent[y] = x; sz[x] += sz[y]; edges[x] += edges[y] + 1; } void add_edge(int x, int y) { x = find(x), y = find(y); if (x != y) onion(x, y); else ++edges[x]; } char query(int x) { x = find(x); if (edges[x] == sz[x]) return '1'; if (edges[x] == 0) return '0'; return '?'; } void split(const int x) { const int r = find(x); --edges[r], --sz[r]; name[x] = ++n; sz[n] = 1; parent[n] = n; } int main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); cin >> n >> q; init(); for (int i = 0; i < q; ++i) { char c; int x, y; cin >> c; switch (c) { case '?': cin >> x; cout << query(x); break; case '+': cin >> x >> y; add_edge(x, y); break; default: cin >> x; split(x); } } cout << '\n'; } |
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