| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 946118 |
2024-03-14T10:35:04 Z |
pan |
Village (BOI20_village) |
C++17 |
|
2 ms |
7260 KB |
#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//#include "bits_stdc++.h"
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define lb lower_bound
#define ub upper_bound
#define input(x) scanf("%lld", &x);
#define input2(x, y) scanf("%lld%lld", &x, &y);
#define input3(x, y, z) scanf("%lld%lld%lld", &x, &y, &z);
#define input4(x, y, z, a) scanf("%lld%lld%lld%lld", &x, &y, &z, &a);
#define print(x, y) printf("%lld%c", x, y);
#define show(x) cerr << #x << " is " << x << endl;
#define show2(x,y) cerr << #x << " is " << x << " " << #y << " is " << y << endl;
#define show3(x,y,z) cerr << #x << " is " << x << " " << #y << " is " << y << " " << #z << " is " << z << endl;
#define discretize(x) sort(x.begin(), x.end()); x.erase(unique(x.begin(), x.end()), x.end());
using namespace std;
//using namespace __gnu_pbds;
//#define ordered_set tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>
//#define ordered_multiset tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update>
typedef long long ll;
typedef long double ld;
typedef pair<ld, ll> pd;
typedef pair<string, ll> psl;
typedef pair<ll, ll> pi;
typedef pair<ll, pi> pii;
ll n, x, y, minval, maxval = 0, label = -1;
vector<ll> adj[100005];
ll minc[100005], maxc[100005], size1[100005], depth[100005], in[100005], conv[100005];
void dfs1(ll p, ll from)
{
size1[from] = 1;
for (ll u: adj[from]) if(p!=u) {dfs1(from, u); size1[from]+=size1[u];}
if (p!=-1 && minc[from]==from)
{
minc[p] = from;
minc[from] = p;
}
}
ll find_centroid(ll p, ll from)
{
for (ll u: adj[from])
{
if (u==p) continue;
if (size1[u]>n/2) return find_centroid(from, u);
}
return from;
}
void dfs2(ll p, ll from)
{
in[from]= ++label;
conv[label] = from;
maxval += depth[from]*2;
for (ll u: adj[from])
{
if (u==p) continue;
depth[u] = depth[from]+1;
dfs2(from, u);
}
}
int main()
{
input(n);
for (ll i=1; i<=n; ++i) minc[i] = maxc[i] = i;
for (ll i=0; i<n-1; ++i)
{
input2(x, y);
adj[x].pb(y);
adj[y].pb(x);
}
// Minimum:
// ans = ((n+1)/2)*2
minval = ((n+1)/2)*2;
dfs1(-1, 1);
if (minc[1]==1) swap(minc[adj[1][0]], minc[1]); // odd n lead to 1 without paur
// Maximum:
// Find centroid, ensure that all ppl change to house that is out of its centroid subtree
// i to be paired with (i+ (n)/2)%n
// As all |subtree| < n/2, his ensure that both are from different subtree
// This is optimal.
ll centroid = find_centroid(-1, 1);
depth[centroid] = 0;
dfs2(-1, centroid);
for (ll i=1; i<=n; ++i)
{
ll in1 = in[i];
ll in2 = (in1 + n/2)%n;
maxc[conv[in2]] = i;
}
// output
cout << minval << ' ' << maxval << '\n';
for (ll i=1; i<=n; ++i) print(minc[i], ' ');
cout << '\n';
//for (ll i=1; i<=n; ++i) print(maxc[i], ' ');
return 0;
}
Compilation message
Village.cpp: In function 'int main()':
Village.cpp:11:23: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
11 | #define input(x) scanf("%lld", &x);
| ~~~~~^~~~~~~~~~~~
Village.cpp:68:2: note: in expansion of macro 'input'
68 | input(n);
| ^~~~~
Village.cpp:12:27: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
12 | #define input2(x, y) scanf("%lld%lld", &x, &y);
| ~~~~~^~~~~~~~~~~~~~~~~~~~
Village.cpp:72:3: note: in expansion of macro 'input2'
72 | input2(x, y);
| ^~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
7256 KB |
Unexpected end of file - int32 expected |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
7260 KB |
Unexpected end of file - int32 expected |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
7256 KB |
Unexpected end of file - int32 expected |
| 2 |
Halted |
0 ms |
0 KB |
- |
