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답안 #789123

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
789123 2023-07-21T05:34:44 Z 박상훈(#10042) Tourism (JOI23_tourism) C++17
28 / 100
 5000 ms 22112 KB 
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
constexpr int B = 400, INF = 1e9 + 100;

int n;
vector<int> adj[100100];
int a[100100], ans[100100], cnt[100100], val;
multiset<pair<int, int>> st;

int in[100100], out[100100], dep[100100], INV[100100], cnti;
int dfn[100100], cntd;

struct Query{
	int s, e, i;
	Query(){}
	Query(int _s, int _e, int _i): s(_s), e(_e), i(_i) {}

	bool operator < (const Query &Q) const{
		if (s / B == Q.s / B){
			if ((s / B) % 2 == 0) return e < Q.e;
			return e > Q.e;
		} 
		return s / B < Q.s / B;
	}
}Q[100100];

struct Seg{
	pair<int, int> tree[400400];
	int sz;

	void init(int n){
		sz = n;
		// for (int i=sz;i<sz*2;i++) printf("(%d, %d) ", tree[i].first, tree[i].second);
		// printf("\n");
		for (int i=sz-1;i;i--) tree[i] = min(tree[i<<1], tree[i<<1|1]);
	}

	int query(int l, int r){
		// printf("  query %d to %d\n", l, r);
		++r;
		pair<int, int> ret = {INF, 0};
		for (l+=sz, r+=sz;l<r;l>>=1, r>>=1){
			if (l&1) ret = min(ret, tree[l++]);
			if (r&1) ret = min(ret, tree[--r]);
		}

		return ret.second;
	}
}rmq;

struct Seg2{
	int tree[400400];
	int sz;

	void init(int n){
		sz = n;
		fill(tree, tree+sz*2, -INF);
	}

	void update(int p, int x){
		p += sz;
		tree[p] = x;
		for(p>>=1;p;p>>=1) tree[p] = max(tree[p<<1], tree[p<<1|1]);
	}

	int query(int l, int r){
		// printf("  query %d to %d\n", l, r);
		++r;
		int ret = -INF;
		for (l+=sz, r+=sz;l<r;l>>=1, r>>=1){
			if (l&1) ret = max(ret, tree[l++]);
			if (r&1) ret = max(ret, tree[--r]);
		}

		return ret;
	}
}prf;

struct Seg3{
	int tree[400400];
	int sz;

	void init(int n){
		sz = n;
		fill(tree, tree+sz*2, INF);
	}

	void update(int p, int x){
		p += sz;
		tree[p] = x;
		for(p>>=1;p;p>>=1) tree[p] = min(tree[p<<1], tree[p<<1|1]);
	}

	int query(int l, int r){
		// printf("  query %d to %d\n", l, r);
		++r;
		int ret = INF;
		for (l+=sz, r+=sz;l<r;l>>=1, r>>=1){
			if (l&1) ret = min(ret, tree[l++]);
			if (r&1) ret = min(ret, tree[--r]);
		}

		return ret;
	}
}suf;


void dfs(int s, int pa = 0){
	in[s] = ++cnti;
	dep[s] = dep[pa] + 1;
	rmq.tree[cnti + rmq.sz] = {dep[s], s};

	dfn[s] = ++cntd;
	INV[cntd] = s;
	
	for (auto &v:adj[s]) if (v!=pa){
		dfs(v, s);

		++cnti;
		rmq.tree[cnti + rmq.sz] = {dep[s], s};
	}

	// out[s] = ++cnti;
	// rmq.tree[cnti + rmq.sz] = {dep[s], s};
}

int dist(int x, int y){
	int lca = rmq.query(min(in[x], in[y]), max(in[x], in[y]));
	// printf(" calc %d %d -> %d (lca = %d)\n", x, y, dep[x] + dep[y] - dep[lca] * 2, lca);
	return dep[x] + dep[y] - dep[lca] * 2;
}

int s0, e0;
void push(int x){
	x = a[x];
	// printf("push %d\n", x);
	cnt[x]++;
	if (cnt[x]==1){
		if (s0==-1){
			s0 = e0 = x;
			val = 0;
		}

		else{
			int prv = prf.query(1, dfn[x]-1);
			int nxt = suf.query(dfn[x]+1, n);

			// printf(" ok %d %d\n", prv, nxt);

			if (prv==-INF) prv = e0;
			else prv = INV[prv];
			if (nxt==INF) nxt = s0;
			else nxt = INV[nxt];

			val -= dist(prv, nxt);
			val += dist(prv, x);
			val += dist(x, nxt);

			if (dfn[e0] < dfn[x]) e0 = x;
			if (dfn[x] < dfn[s0]) s0 = x;

			// printf("prv = %d / nxt = %d / range: [%d, %d] / val = %d\n", prv, nxt, s0, e0, val);
		}

		prf.update(dfn[x], dfn[x]);
		suf.update(dfn[x], dfn[x]);

		



		// auto iter = st.emplace(in[x], x);

		// auto prv = (iter==st.begin())?(prev(st.end())):(prev(iter));
		// auto nxt = (next(iter)==st.end())?(st.begin()):(next(iter));

		// val -= dist(prv->second, nxt->second);
		// val += dist(prv->second, iter->second);
		// val += dist(iter->second, nxt->second);
	}

	// printf(" ok val = %d\n", val);
}

void pop(int x){
	x = a[x];
	// printf("pop %d\n", x);
	cnt[x]--;
	if (cnt[x]==0){
		if (s0==e0){
			s0 = e0 = -1;
			val = 0;
		}

		else{
			int prv = prf.query(1, dfn[x]-1);
			int nxt = suf.query(dfn[x]+1, n);

			if (prv==-INF) prv = e0;
			else prv = INV[prv];
			if (nxt==INF) nxt = s0;
			else nxt = INV[nxt];

			val += dist(prv, nxt);
			val -= dist(prv, x);
			val -= dist(x, nxt);

			if (e0==x) e0 = prv;
			if (s0==x) s0 = nxt;

			// printf("prv = %d / nxt = %d / range: [%d, %d] / val = %d\n", prv, nxt, s0, e0, val);
		}

		prf.update(dfn[x], -INF);
		suf.update(dfn[x], INF);


		// auto iter = st.find(pair<int, int>(in[x], x));
		// assert(iter!=st.end());

		// auto prv = (iter==st.begin())?(prev(st.end())):(prev(iter));
		// auto nxt = (next(iter)==st.end())?(st.begin()):(next(iter));

		// val += dist(prv->second, nxt->second);
		// val -= dist(prv->second, iter->second);
		// val -= dist(iter->second, nxt->second);

		// st.erase(iter);
	}

	// printf(" ok val = %d\n", val);
}

int main(){
	int m, q;
	scanf("%d %d %d", &n, &m, &q);

	for (int i=1;i<=n-1;i++){
		int x, y;
		scanf("%d %d", &x, &y);
		adj[x].push_back(y);
		adj[y].push_back(x);
	}

	for (int i=1;i<=m;i++) scanf("%d", a+i);

	for (int i=1;i<=q;i++){
		scanf("%d %d", &Q[i].s, &Q[i].e);
		Q[i].i = i;
	}

	rmq.sz = n*2+10;
	dfs(1);
	rmq.init(n*2+10);

	sort(Q+1, Q+q+1);
	int l = 1, r = 0;

	s0 = e0 = -1;
	prf.init(n+1);
	suf.init(n+1);

	for (int i=1;i<=q;i++){
		while(r<Q[i].e){
			++r;
			push(r);
		}

		while(l>Q[i].s){
			--l;
			push(l);
		}

		while(r>Q[i].e){
			pop(r);
			r--;
		}

		while(l<Q[i].s){
			pop(l);
			l++;
		}

		ans[Q[i].i] = val/2 + 1;
	}

	for (int i=1;i<=q;i++) printf("%d\n", ans[i]);

}

Compilation message

tourism.cpp: In function 'int main()':
tourism.cpp:238:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  238 |  scanf("%d %d %d", &n, &m, &q);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
tourism.cpp:242:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  242 |   scanf("%d %d", &x, &y);
      |   ~~~~~^~~~~~~~~~~~~~~~~
tourism.cpp:247:30: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  247 |  for (int i=1;i<=m;i++) scanf("%d", a+i);
      |                         ~~~~~^~~~~~~~~~~
tourism.cpp:250:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  250 |   scanf("%d %d", &Q[i].s, &Q[i].e);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 5716 KB Output is correct
2 Correct 2 ms 5844 KB Output is correct
3 Correct 2 ms 5716 KB Output is correct
4 Correct 4 ms 5844 KB Output is correct
5 Correct 3 ms 5844 KB Output is correct
6 Correct 3 ms 5844 KB Output is correct
7 Correct 3 ms 5844 KB Output is correct
8 Correct 3 ms 5844 KB Output is correct
9 Correct 6 ms 5860 KB Output is correct
10 Correct 5 ms 5844 KB Output is correct
11 Correct 5 ms 5860 KB Output is correct
12 Correct 3 ms 5844 KB Output is correct
13 Correct 3 ms 5844 KB Output is correct
14 Correct 3 ms 5844 KB Output is correct
15 Correct 4 ms 5844 KB Output is correct
16 Correct 4 ms 5844 KB Output is correct
17 Correct 4 ms 5864 KB Output is correct
18 Correct 4 ms 5844 KB Output is correct
19 Correct 4 ms 5844 KB Output is correct
20 Correct 5 ms 5844 KB Output is correct
21 Correct 4 ms 5844 KB Output is correct
22 Correct 4 ms 5860 KB Output is correct
23 Correct 6 ms 5860 KB Output is correct
24 Correct 4 ms 5844 KB Output is correct
25 Correct 5 ms 5844 KB Output is correct
26 Correct 4 ms 5844 KB Output is correct
27 Correct 3 ms 5844 KB Output is correct
28 Correct 2 ms 5844 KB Output is correct
29 Correct 3 ms 5844 KB Output is correct

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 5716 KB Output is correct
2 Correct 2 ms 5844 KB Output is correct
3 Correct 2 ms 5716 KB Output is correct
4 Correct 4 ms 5844 KB Output is correct
5 Correct 3 ms 5844 KB Output is correct
6 Correct 3 ms 5844 KB Output is correct
7 Correct 3 ms 5844 KB Output is correct
8 Correct 3 ms 5844 KB Output is correct
9 Correct 6 ms 5860 KB Output is correct
10 Correct 5 ms 5844 KB Output is correct
11 Correct 5 ms 5860 KB Output is correct
12 Correct 3 ms 5844 KB Output is correct
13 Correct 3 ms 5844 KB Output is correct
14 Correct 3 ms 5844 KB Output is correct
15 Correct 4 ms 5844 KB Output is correct
16 Correct 4 ms 5844 KB Output is correct
17 Correct 4 ms 5864 KB Output is correct
18 Correct 4 ms 5844 KB Output is correct
19 Correct 4 ms 5844 KB Output is correct
20 Correct 5 ms 5844 KB Output is correct
21 Correct 4 ms 5844 KB Output is correct
22 Correct 4 ms 5860 KB Output is correct
23 Correct 6 ms 5860 KB Output is correct
24 Correct 4 ms 5844 KB Output is correct
25 Correct 5 ms 5844 KB Output is correct
26 Correct 4 ms 5844 KB Output is correct
27 Correct 3 ms 5844 KB Output is correct
28 Correct 2 ms 5844 KB Output is correct
29 Correct 3 ms 5844 KB Output is correct
30 Correct 32 ms 5944 KB Output is correct
31 Correct 37 ms 5844 KB Output is correct
32 Correct 45 ms 5996 KB Output is correct
33 Correct 54 ms 6004 KB Output is correct
34 Correct 44 ms 6004 KB Output is correct
35 Correct 5 ms 5972 KB Output is correct
36 Correct 5 ms 6028 KB Output is correct
37 Correct 5 ms 5972 KB Output is correct
38 Correct 39 ms 6104 KB Output is correct
39 Correct 37 ms 6112 KB Output is correct
40 Correct 44 ms 6120 KB Output is correct
41 Correct 7 ms 6100 KB Output is correct
42 Correct 5 ms 6100 KB Output is correct
43 Correct 6 ms 6100 KB Output is correct
44 Correct 39 ms 6044 KB Output is correct
45 Correct 38 ms 6032 KB Output is correct
46 Correct 39 ms 6052 KB Output is correct
47 Correct 4 ms 5972 KB Output is correct
48 Correct 5 ms 6024 KB Output is correct
49 Correct 5 ms 5972 KB Output is correct
50 Correct 40 ms 5972 KB Output is correct
51 Correct 37 ms 5972 KB Output is correct
52 Correct 38 ms 6000 KB Output is correct
53 Correct 40 ms 6000 KB Output is correct
54 Correct 40 ms 5972 KB Output is correct
55 Correct 39 ms 5972 KB Output is correct
56 Correct 4 ms 5844 KB Output is correct
57 Correct 4 ms 5944 KB Output is correct
58 Correct 6 ms 5972 KB Output is correct

Subtask #3
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5844 KB Output is correct
2 Correct 3 ms 5844 KB Output is correct
3 Correct 4 ms 5844 KB Output is correct
4 Correct 4089 ms 15812 KB Output is correct
5 Correct 3517 ms 19140 KB Output is correct
6 Correct 4369 ms 20544 KB Output is correct
7 Execution timed out 5087 ms 22112 KB Time limit exceeded
8 Halted 0 ms 0 KB -

Subtask #4
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 5844 KB Output is correct
2 Correct 160 ms 9752 KB Output is correct
3 Correct 244 ms 10216 KB Output is correct
4 Correct 192 ms 10668 KB Output is correct
5 Correct 72 ms 12840 KB Output is correct
6 Correct 88 ms 12948 KB Output is correct
7 Correct 132 ms 12944 KB Output is correct
8 Correct 139 ms 12900 KB Output is correct
9 Correct 165 ms 12840 KB Output is correct
10 Correct 188 ms 12944 KB Output is correct
11 Correct 276 ms 12852 KB Output is correct
12 Correct 333 ms 12984 KB Output is correct
13 Correct 319 ms 13024 KB Output is correct
14 Correct 347 ms 13556 KB Output is correct
15 Correct 319 ms 14656 KB Output is correct
16 Correct 258 ms 13060 KB Output is correct
17 Correct 233 ms 13088 KB Output is correct
18 Correct 243 ms 13068 KB Output is correct
19 Correct 63 ms 13004 KB Output is correct
20 Correct 86 ms 12876 KB Output is correct
21 Correct 92 ms 12952 KB Output is correct
22 Correct 120 ms 12988 KB Output is correct
23 Correct 115 ms 12932 KB Output is correct
24 Correct 130 ms 12972 KB Output is correct
25 Correct 151 ms 12956 KB Output is correct
26 Correct 144 ms 12948 KB Output is correct
27 Correct 207 ms 12996 KB Output is correct
28 Correct 248 ms 12964 KB Output is correct
29 Correct 264 ms 13004 KB Output is correct
30 Correct 282 ms 13012 KB Output is correct
31 Correct 311 ms 13332 KB Output is correct
32 Correct 293 ms 13312 KB Output is correct
33 Correct 310 ms 13780 KB Output is correct
34 Correct 288 ms 14752 KB Output is correct

Subtask #5
0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 5844 KB Output is correct
2 Correct 3 ms 5844 KB Output is correct
3 Correct 3 ms 5844 KB Output is correct
4 Execution timed out 5047 ms 11280 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #6
0 / 41.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 5716 KB Output is correct
2 Correct 2 ms 5844 KB Output is correct
3 Correct 2 ms 5716 KB Output is correct
4 Correct 4 ms 5844 KB Output is correct
5 Correct 3 ms 5844 KB Output is correct
6 Correct 3 ms 5844 KB Output is correct
7 Correct 3 ms 5844 KB Output is correct
8 Correct 3 ms 5844 KB Output is correct
9 Correct 6 ms 5860 KB Output is correct
10 Correct 5 ms 5844 KB Output is correct
11 Correct 5 ms 5860 KB Output is correct
12 Correct 3 ms 5844 KB Output is correct
13 Correct 3 ms 5844 KB Output is correct
14 Correct 3 ms 5844 KB Output is correct
15 Correct 4 ms 5844 KB Output is correct
16 Correct 4 ms 5844 KB Output is correct
17 Correct 4 ms 5864 KB Output is correct
18 Correct 4 ms 5844 KB Output is correct
19 Correct 4 ms 5844 KB Output is correct
20 Correct 5 ms 5844 KB Output is correct
21 Correct 4 ms 5844 KB Output is correct
22 Correct 4 ms 5860 KB Output is correct
23 Correct 6 ms 5860 KB Output is correct
24 Correct 4 ms 5844 KB Output is correct
25 Correct 5 ms 5844 KB Output is correct
26 Correct 4 ms 5844 KB Output is correct
27 Correct 3 ms 5844 KB Output is correct
28 Correct 2 ms 5844 KB Output is correct
29 Correct 3 ms 5844 KB Output is correct
30 Correct 32 ms 5944 KB Output is correct
31 Correct 37 ms 5844 KB Output is correct
32 Correct 45 ms 5996 KB Output is correct
33 Correct 54 ms 6004 KB Output is correct
34 Correct 44 ms 6004 KB Output is correct
35 Correct 5 ms 5972 KB Output is correct
36 Correct 5 ms 6028 KB Output is correct
37 Correct 5 ms 5972 KB Output is correct
38 Correct 39 ms 6104 KB Output is correct
39 Correct 37 ms 6112 KB Output is correct
40 Correct 44 ms 6120 KB Output is correct
41 Correct 7 ms 6100 KB Output is correct
42 Correct 5 ms 6100 KB Output is correct
43 Correct 6 ms 6100 KB Output is correct
44 Correct 39 ms 6044 KB Output is correct
45 Correct 38 ms 6032 KB Output is correct
46 Correct 39 ms 6052 KB Output is correct
47 Correct 4 ms 5972 KB Output is correct
48 Correct 5 ms 6024 KB Output is correct
49 Correct 5 ms 5972 KB Output is correct
50 Correct 40 ms 5972 KB Output is correct
51 Correct 37 ms 5972 KB Output is correct
52 Correct 38 ms 6000 KB Output is correct
53 Correct 40 ms 6000 KB Output is correct
54 Correct 40 ms 5972 KB Output is correct
55 Correct 39 ms 5972 KB Output is correct
56 Correct 4 ms 5844 KB Output is correct
57 Correct 4 ms 5944 KB Output is correct
58 Correct 6 ms 5972 KB Output is correct
59 Correct 3 ms 5844 KB Output is correct
60 Correct 3 ms 5844 KB Output is correct
61 Correct 4 ms 5844 KB Output is correct
62 Correct 4089 ms 15812 KB Output is correct
63 Correct 3517 ms 19140 KB Output is correct
64 Correct 4369 ms 20544 KB Output is correct
65 Execution timed out 5087 ms 22112 KB Time limit exceeded
66 Halted 0 ms 0 KB -