답안 #217527

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
217527	2020-03-30T07:03:03 Z	BThero	수도 (JOI20_capital_city)	C++17	11 / 100	3000 ms	213024 KB

capital_city

// chrono::system_clock::now().time_since_epoch().count()
#include<bits/stdc++.h>
//#include<ext/pb_ds/tree_policy.hpp>
//#include<ext/pb_ds/assoc_container.hpp>

#define __DBG 1
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define debug(x) if (__DBG) cerr << #x << " = " << x << endl;

using namespace std;
//using namespace __gnu_pbds;

//template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

typedef long long ll;
typedef pair<int, int> pii;

const int MAXN = (int)2e5 + 5;
const int K = 18;

vector<int> adj[MAXN], adj2[MAXN], adj3[MAXN], ord;
int tin[MAXN], tout[MAXN], timer;
int par[MAXN][K];
pii e[MAXN];
int n, m, nn;
int col[MAXN], col2[MAXN], sz[MAXN];
int boss[MAXN];
bool used[MAXN], leaf[MAXN];

void dfs(int v, int pr) {
	par[v][0] = pr;
	
	for (int i = 1; i < K; ++i) {
		par[v][i] = par[par[v][i - 1]][i - 1];
	}
	
	tin[v] = ++timer;
	
	for (int to : adj[v]) {
		if (to != pr) {
			dfs(to, v);
		}
	}
	
	tout[v] = timer;
}

bool isUpper(int a, int b) {
	return tin[a] <= tin[b] && tin[b] <= tout[a];
}

int lca(int a, int b) {
	if (isUpper(a, b)) {
		return a;
	}
	
	if (isUpper(b, a)) {
		return b;
	}
	
	for (int i = K - 1; i >= 0; --i) {
		if (!isUpper(par[a][i], b)) {
			a = par[a][i];
		}
	}
	
	return par[a][0];
}

void dfs2(int v) {
	used[v] = 1;
	
	for (int to : adj2[v]) {
		if (!used[to]) {
			dfs2(to);
		}
	}
	
	ord.pb(v);
}

void dfs3(int v) {
	col2[v] = nn;
	++sz[nn];
	used[v] = 1;
	
	for (int to : adj3[v]) {
		if (!used[to]) {
			dfs3(to);
		}
	}
}

void addEdge(int u, int v) {
	//printf("! %d %d\n", u, v);
	adj2[u].pb(v);
	adj3[v].pb(u);
}

void solve() {
	scanf("%d %d", &n, &m);
	
	for (int i = 1; i < n; ++i) {
		int u, v;
		scanf("%d %d", &u, &v);
		e[i] = mp(u, v);
		adj[u].pb(v);
		adj[v].pb(u);
	}
	
	for (int i = 1; i <= n; ++i) {
		scanf("%d", &col[i]);
	}
	
	dfs(1, 1);
	
	for (int i = 1; i <= n; ++i) {
		if (boss[col[i]] == 0) {
			boss[col[i]] = i;
		}
		else {
			boss[col[i]] = lca(boss[col[i]], i);
		}
	}
	
	for (int i = 1; i <= m; ++i) {
		for (int j = 1; j <= n; ++j) {
			used[j] = 0;
		}
		
		for (int j = 1; j <= n; ++j) {
			if (col[j] == i) {
				for (int x = j;; x = par[x][0]) {
					used[x] = 1;
					
					if (x == boss[i]) {
						break;
					}
				}
			}
		}
		
		for (int j = 1; j <= n; ++j) {
			if (used[j]) {
				addEdge(i, col[j]);
			}
		}
	}
	
	for (int i = 1; i <= m; ++i) {
		used[i] = 0;
	}
	
	for (int i = 1; i <= m; ++i) {
		if (!used[i]) {
			dfs2(i);
		}
	}
	
	for (int i = 1; i <= m; ++i) {
		used[i] = 0;
	}
	
	for (int i = 1; i <= m; ++i) {
		int v = ord[m - i];
		
		if (!used[v]) {
			++nn;
			dfs3(v);
		}
	}
	
	for (int i = 1; i <= nn; ++i) {
		leaf[i] = 1;
	}
	
	for (int i = 1; i <= m; ++i) {
		for (int to : adj2[i]) {
			int a = col2[i];
			int b = col2[to];
			
			if (a != b) {
				leaf[a] = 0;
			}
		}
	}
	
	int ans = m;
	
	for (int i = 1; i <= nn; ++i) {
		if (leaf[i]) {
			ans = min(ans, sz[i]);
		}
	}
	
	printf("%d\n", ans - 1);
}

int main() {
	int tt = 1;
	
	while (tt--) {
		solve();
	}

	return 0;
}

Compilation message

capital_city.cpp: In function 'void solve()':
capital_city.cpp:106:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~~
capital_city.cpp:110:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &u, &v);
   ~~~~~^~~~~~~~~~~~~~~~~
capital_city.cpp:117:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &col[i]);
   ~~~~~^~~~~~~~~~~~~~~

Subtask #1
1.0 / 1.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	14464 KB	Output is correct
2	Correct	12 ms	14464 KB	Output is correct
3	Correct	12 ms	14464 KB	Output is correct
4	Correct	12 ms	14464 KB	Output is correct
5	Correct	12 ms	14464 KB	Output is correct
6	Correct	15 ms	14464 KB	Output is correct
7	Correct	12 ms	14464 KB	Output is correct
8	Correct	12 ms	14464 KB	Output is correct
9	Correct	12 ms	14464 KB	Output is correct
10	Correct	12 ms	14464 KB	Output is correct

Subtask #2
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	14464 KB	Output is correct
2	Correct	12 ms	14464 KB	Output is correct
3	Correct	12 ms	14464 KB	Output is correct
4	Correct	12 ms	14464 KB	Output is correct
5	Correct	12 ms	14464 KB	Output is correct
6	Correct	15 ms	14464 KB	Output is correct
7	Correct	12 ms	14464 KB	Output is correct
8	Correct	12 ms	14464 KB	Output is correct
9	Correct	12 ms	14464 KB	Output is correct
10	Correct	12 ms	14464 KB	Output is correct
11	Correct	14 ms	14720 KB	Output is correct
12	Correct	14 ms	14848 KB	Output is correct
13	Correct	14 ms	14848 KB	Output is correct
14	Correct	15 ms	14848 KB	Output is correct
15	Correct	18 ms	15104 KB	Output is correct
16	Correct	21 ms	15744 KB	Output is correct
17	Correct	24 ms	16756 KB	Output is correct
18	Correct	28 ms	16876 KB	Output is correct
19	Correct	24 ms	16884 KB	Output is correct
20	Correct	24 ms	16888 KB	Output is correct
21	Correct	25 ms	16884 KB	Output is correct
22	Correct	39 ms	25464 KB	Output is correct
23	Correct	49 ms	24824 KB	Output is correct
24	Correct	17 ms	14848 KB	Output is correct
25	Correct	18 ms	14976 KB	Output is correct
26	Correct	18 ms	14720 KB	Output is correct
27	Correct	19 ms	14976 KB	Output is correct
28	Correct	18 ms	15360 KB	Output is correct
29	Correct	20 ms	15360 KB	Output is correct
30	Correct	19 ms	15232 KB	Output is correct

Subtask #3
0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	3071 ms	213024 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

Subtask #4
0 / 59.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	14464 KB	Output is correct
2	Correct	12 ms	14464 KB	Output is correct
3	Correct	12 ms	14464 KB	Output is correct
4	Correct	12 ms	14464 KB	Output is correct
5	Correct	12 ms	14464 KB	Output is correct
6	Correct	15 ms	14464 KB	Output is correct
7	Correct	12 ms	14464 KB	Output is correct
8	Correct	12 ms	14464 KB	Output is correct
9	Correct	12 ms	14464 KB	Output is correct
10	Correct	12 ms	14464 KB	Output is correct
11	Correct	14 ms	14720 KB	Output is correct
12	Correct	14 ms	14848 KB	Output is correct
13	Correct	14 ms	14848 KB	Output is correct
14	Correct	15 ms	14848 KB	Output is correct
15	Correct	18 ms	15104 KB	Output is correct
16	Correct	21 ms	15744 KB	Output is correct
17	Correct	24 ms	16756 KB	Output is correct
18	Correct	28 ms	16876 KB	Output is correct
19	Correct	24 ms	16884 KB	Output is correct
20	Correct	24 ms	16888 KB	Output is correct
21	Correct	25 ms	16884 KB	Output is correct
22	Correct	39 ms	25464 KB	Output is correct
23	Correct	49 ms	24824 KB	Output is correct
24	Correct	17 ms	14848 KB	Output is correct
25	Correct	18 ms	14976 KB	Output is correct
26	Correct	18 ms	14720 KB	Output is correct
27	Correct	19 ms	14976 KB	Output is correct
28	Correct	18 ms	15360 KB	Output is correct
29	Correct	20 ms	15360 KB	Output is correct
30	Correct	19 ms	15232 KB	Output is correct
31	Execution timed out	3071 ms	213024 KB	Time limit exceeded
32	Halted	0 ms	0 KB	-

답안 #217527

Compilation message

Subtask #1 1.0 / 1.0

Subtask #2 10.0 / 10.0

Subtask #3 0 / 30.0

Subtask #4 0 / 59.0

Subtask #1
1.0 / 1.0

Subtask #2
10.0 / 10.0

Subtask #3
0 / 30.0

Subtask #4
0 / 59.0