#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;
typedef pair<int, int> pi;
typedef pair<ll,ll> pl;
typedef pair<ld,ld> pd;
typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<cd> vcd;
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;
#define FOR(i, a, b) for (int i=a; i<(b); i++)
#define F0R(i, a) for (int i=0; i<(a); i++)
#define FORd(i,a,b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i,a) for (int i = (a)-1; i >= 0; i--)
#define sz(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
const int MOD = 1000000007;
const ll INF = 1e18;
const int MX = 100001;
int n,m,q,l[MX],r[MX];
pi p[MX];
vi tri[MX];
vpi ed;
template<int SZ> struct DSU {
int par[SZ], sz[SZ];
DSU() {
F0R(i,SZ) par[i] = i, sz[i] = 1;
}
int get(int x) { // path compression
if (par[x] != x) par[x] = get(par[x]);
return par[x];
}
bool unite(int x, int y) { // union-by-rank
x = get(x), y = get(y);
if (x == y) return 0;
if (sz[x] < sz[y]) swap(x,y);
sz[x] += sz[y], par[y] = x;
return 1;
}
};
bool left() {
F0R(i,sz(ed)) tri[i].clear();
bool ok = 0;
F0R(i,q) if (l[i] != r[i]) {
tri[(l[i]+r[i])/2].pb(i);
ok = 1;
}
return ok;
}
void test() {
DSU<MX> D = DSU<MX>();
F0R(i,sz(ed)+1) {
if (i) D.unite(ed[i-1].f,ed[i-1].s);
for (int x: tri[i]) {
if (D.get(p[x].f) == D.get(p[x].s)) r[x] = i;
else l[x] = i+1;
}
}
}
int main() {
ios_base::sync_with_stdio(0); cin.tie(0);
cin >> n >> m >> q;
DSU<MX> D = DSU<MX>();
FOR(i,1,m+1) {
int t = m+1-i;
for (int j = t; j+t <= n; j += t) if (D.unite(j,j+t)) ed.pb({j,j+t});
}
F0R(i,q) {
cin >> p[i].f >> p[i].s;
l[i] = 0, r[i] = sz(ed);
}
while (left()) test();
F0R(i,q) {
if (l[i] == 0) {
cout << "0\n";
} else {
l[i] --;
cout << m+1-__gcd(ed[l[i]].f,ed[l[i]].s) << "\n";
}
}
}
/* Look for:
* the exact constraints (multiple sets are too slow for n=10^6 :( )
* special cases (n=1?)
* overflow (ll vs int?)
* array bounds
*/
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
11 ms |
4856 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
5928 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
64 ms |
9740 KB |
Output is correct |
| 2 |
Correct |
66 ms |
10732 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
83 ms |
13600 KB |
Output is correct |
| 2 |
Correct |
63 ms |
14056 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
73 ms |
14056 KB |
Output is correct |
| 2 |
Correct |
73 ms |
14056 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
112 ms |
14868 KB |
Output is correct |
| 2 |
Correct |
85 ms |
16152 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
150 ms |
18808 KB |
Output is correct |
| 2 |
Correct |
113 ms |
18808 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
167 ms |
22588 KB |
Output is correct |
| 2 |
Correct |
160 ms |
23320 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
179 ms |
25688 KB |
Output is correct |
| 2 |
Correct |
231 ms |
27352 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
219 ms |
30432 KB |
Output is correct |
| 2 |
Correct |
297 ms |
31304 KB |
Output is correct |
