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답안 #923891

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
923891 2024-02-08T04:47:10 Z byunjaewoo Simurgh (IOI17_simurgh) C++17
100 / 100
 290 ms 7472 KB 
#include "simurgh.h"
#include <bits/stdc++.h>
using namespace std;

const int Nmax=510, Kmax=Nmax*Nmax/2;
int N, M, p, u[Kmax], v[Kmax], par[Nmax], parc[Nmax], dep[Nmax], dfsn[Nmax], top[Nmax], low[Nmax], back[Nmax];
int total, chk[Kmax];
vector<pair<int, int>> adj[Nmax], adj2[Nmax];
vector<tuple<int, int, int>> tree;
vector<int> V;

int value(int x, int y) {
	for(int &i:V) if(i==x) i=y;
	int ret=count_common_roads(V);
	for(int &i:V) if(i==y) i=x;
	return ret;
}

int value2(vector<int> X) {
	for(int i:X) {
		if(dep[u[i]]<dep[v[i]]) swap(u[i], v[i]);
		for(int &j:V) if(j==parc[u[i]]) j=i;
	}
	int ret=count_common_roads(V)-total;
	for(int i:X) {
		for(int &j:V) if(j==i) j=parc[u[i]], ret+=chk[parc[u[i]]];
	}
	return ret;
}

void DFS(int curr, int prev) {
	dfsn[curr]=top[curr]=++p;
	for(auto [next, c]:adj[curr]) if(next!=prev) {
		if(dfsn[next]) {
			if(top[curr]>dfsn[next]) top[curr]=dfsn[next], back[curr]=c, low[curr]=curr;
		}
		else {
			par[next]=curr, parc[next]=c, dep[next]=dep[curr]+1;
			tree.push_back({curr, next, c});
			adj2[curr].push_back({next, c});
			DFS(next, curr);
			if(top[curr]>top[next]) top[curr]=top[next], back[curr]=back[next], low[curr]=low[next];
		}
	}
}

void DFS2(int curr) {
	for(auto [next, c]:adj2[curr]) {
		DFS2(next);
		if(chk[c]!=-1) continue;
		if(top[next]>dfsn[curr]) chk[c]=1;
		else {
			vector<int> tmp;
			bool flag=false; int q=0;
			for(int i=low[next]; dfsn[i]!=top[next]; i=par[i]) {
				tmp.push_back(parc[i]);
				if(chk[parc[i]]!=-1) flag=true, q=parc[i];
			}
			if(flag) {
				chk[back[next]]=chk[q]+value(q, back[next])-total;
				for(int i:tmp) if(chk[i]==-1) chk[i]=chk[back[next]]-value(i, back[next])+total;
			}
			else {
				int X=total;
				vector<int> Y;
				for(int i:tmp) Y.push_back(value(i, back[next]));
				bool flag2=false;
				for(int i=0; i<Y.size(); i++) {
					if(Y[i]==X+1) flag2=true, chk[back[next]]=1, chk[tmp[i]]=0;
					else if(Y[i]==X-1) flag2=true, chk[back[next]]=0, chk[tmp[i]]=1;
				}
				if(flag2) {
					for(int i=0; i<Y.size(); i++) if(Y[i]==X) chk[tmp[i]]=chk[back[next]];
				}
				else {
					chk[back[next]]=false;
					for(int i=0; i<Y.size(); i++) if(Y[i]==X) chk[tmp[i]]=false;
				}
			}
		}
	}
}

void F(int l, int r, int sum, vector<int> E) {
	if(l==r) {
		if(sum) chk[E[l]]=1;
		else chk[E[r]]=0;
		return;
	}
	if(l>r) return;
	int m=(l+r)/2;
	vector<int> tmp;
	for(int i=l; i<=m; i++) tmp.push_back(E[i]);
	int lsum=value2(tmp);
	if(lsum) F(l, m, lsum, E);
	if(sum-lsum) F(m+1, r, sum-lsum, E);
}

std::vector<int> find_roads(int n, std::vector<int> u, std::vector<int> v) {
	N=n, M=u.size();
	for(int i=0; i<M; i++) {
		::u[i]=u[i], ::v[i]=v[i];
		adj[u[i]].push_back({v[i], i}), adj[v[i]].push_back({u[i], i});
	}
	for(int i=0; i<M; i++) chk[i]=-1;
	DFS(0, -1);
	for(auto [u, v, c]:tree) V.push_back(c);
	total=count_common_roads(V);
	DFS2(0);
	for(int i=0; i<N; i++) {
		vector<int> E;
		for(auto [j, c]:adj[i]) if(dfsn[j]>dfsn[i] && chk[c]==-1) E.push_back(c);
		if(!E.empty()) F(0, E.size()-1, value2(E), E);
	}
	vector<int> ret;
	for(int i=0; i<M; i++) if(chk[i]==1) ret.push_back(i);
	return ret;
}

Compilation message

simurgh.cpp: In function 'void DFS2(int)':
simurgh.cpp:68:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |     for(int i=0; i<Y.size(); i++) {
      |                  ~^~~~~~~~~
simurgh.cpp:73:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |      for(int i=0; i<Y.size(); i++) if(Y[i]==X) chk[tmp[i]]=chk[back[next]];
      |                   ~^~~~~~~~~
simurgh.cpp:77:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |      for(int i=0; i<Y.size(); i++) if(Y[i]==X) chk[tmp[i]]=false;
      |                   ~^~~~~~~~~

Subtask #1
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB correct
2 Correct 0 ms 348 KB correct
3 Correct 0 ms 348 KB correct
4 Correct 0 ms 348 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 344 KB correct
9 Correct 1 ms 348 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 0 ms 348 KB correct

Subtask #2
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB correct
2 Correct 0 ms 348 KB correct
3 Correct 0 ms 348 KB correct
4 Correct 0 ms 348 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 344 KB correct
9 Correct 1 ms 348 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 0 ms 348 KB correct
14 Correct 1 ms 348 KB correct
15 Correct 1 ms 344 KB correct
16 Correct 1 ms 348 KB correct
17 Correct 1 ms 348 KB correct
18 Correct 1 ms 348 KB correct
19 Correct 1 ms 348 KB correct
20 Correct 1 ms 348 KB correct
21 Correct 1 ms 348 KB correct
22 Correct 1 ms 348 KB correct
23 Correct 1 ms 348 KB correct
24 Correct 1 ms 348 KB correct
25 Correct 0 ms 348 KB correct
26 Correct 1 ms 348 KB correct
27 Correct 1 ms 348 KB correct
28 Correct 1 ms 344 KB correct
29 Correct 1 ms 348 KB correct
30 Correct 1 ms 348 KB correct
31 Correct 1 ms 344 KB correct
32 Correct 1 ms 348 KB correct
33 Correct 1 ms 348 KB correct

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB correct
2 Correct 0 ms 348 KB correct
3 Correct 0 ms 348 KB correct
4 Correct 0 ms 348 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 344 KB correct
9 Correct 1 ms 348 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 0 ms 348 KB correct
14 Correct 1 ms 348 KB correct
15 Correct 1 ms 344 KB correct
16 Correct 1 ms 348 KB correct
17 Correct 1 ms 348 KB correct
18 Correct 1 ms 348 KB correct
19 Correct 1 ms 348 KB correct
20 Correct 1 ms 348 KB correct
21 Correct 1 ms 348 KB correct
22 Correct 1 ms 348 KB correct
23 Correct 1 ms 348 KB correct
24 Correct 1 ms 348 KB correct
25 Correct 0 ms 348 KB correct
26 Correct 1 ms 348 KB correct
27 Correct 1 ms 348 KB correct
28 Correct 1 ms 344 KB correct
29 Correct 1 ms 348 KB correct
30 Correct 1 ms 348 KB correct
31 Correct 1 ms 344 KB correct
32 Correct 1 ms 348 KB correct
33 Correct 1 ms 348 KB correct
34 Correct 36 ms 2136 KB correct
35 Correct 38 ms 1984 KB correct
36 Correct 26 ms 1628 KB correct
37 Correct 4 ms 604 KB correct
38 Correct 36 ms 2024 KB correct
39 Correct 30 ms 1628 KB correct
40 Correct 24 ms 1628 KB correct
41 Correct 35 ms 1884 KB correct
42 Correct 32 ms 1996 KB correct
43 Correct 17 ms 1428 KB correct
44 Correct 14 ms 1116 KB correct
45 Correct 20 ms 1112 KB correct
46 Correct 13 ms 1092 KB correct
47 Correct 7 ms 604 KB correct
48 Correct 1 ms 348 KB correct
49 Correct 3 ms 604 KB correct
50 Correct 7 ms 788 KB correct
51 Correct 16 ms 1116 KB correct
52 Correct 14 ms 1112 KB correct
53 Correct 13 ms 860 KB correct
54 Correct 18 ms 1372 KB correct
55 Correct 16 ms 1116 KB correct
56 Correct 16 ms 1232 KB correct
57 Correct 16 ms 1116 KB correct

Subtask #4
19.0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB correct
2 Correct 0 ms 348 KB correct
3 Correct 140 ms 4444 KB correct
4 Correct 266 ms 7468 KB correct
5 Correct 281 ms 6996 KB correct
6 Correct 199 ms 6992 KB correct
7 Correct 236 ms 7136 KB correct
8 Correct 246 ms 7188 KB correct
9 Correct 264 ms 7472 KB correct
10 Correct 284 ms 7236 KB correct
11 Correct 261 ms 7244 KB correct
12 Correct 261 ms 7228 KB correct
13 Correct 0 ms 344 KB correct
14 Correct 234 ms 7004 KB correct
15 Correct 290 ms 7228 KB correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB correct
2 Correct 0 ms 348 KB correct
3 Correct 0 ms 348 KB correct
4 Correct 0 ms 348 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 344 KB correct
9 Correct 1 ms 348 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 0 ms 348 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 0 ms 348 KB correct
14 Correct 1 ms 348 KB correct
15 Correct 1 ms 344 KB correct
16 Correct 1 ms 348 KB correct
17 Correct 1 ms 348 KB correct
18 Correct 1 ms 348 KB correct
19 Correct 1 ms 348 KB correct
20 Correct 1 ms 348 KB correct
21 Correct 1 ms 348 KB correct
22 Correct 1 ms 348 KB correct
23 Correct 1 ms 348 KB correct
24 Correct 1 ms 348 KB correct
25 Correct 0 ms 348 KB correct
26 Correct 1 ms 348 KB correct
27 Correct 1 ms 348 KB correct
28 Correct 1 ms 344 KB correct
29 Correct 1 ms 348 KB correct
30 Correct 1 ms 348 KB correct
31 Correct 1 ms 344 KB correct
32 Correct 1 ms 348 KB correct
33 Correct 1 ms 348 KB correct
34 Correct 36 ms 2136 KB correct
35 Correct 38 ms 1984 KB correct
36 Correct 26 ms 1628 KB correct
37 Correct 4 ms 604 KB correct
38 Correct 36 ms 2024 KB correct
39 Correct 30 ms 1628 KB correct
40 Correct 24 ms 1628 KB correct
41 Correct 35 ms 1884 KB correct
42 Correct 32 ms 1996 KB correct
43 Correct 17 ms 1428 KB correct
44 Correct 14 ms 1116 KB correct
45 Correct 20 ms 1112 KB correct
46 Correct 13 ms 1092 KB correct
47 Correct 7 ms 604 KB correct
48 Correct 1 ms 348 KB correct
49 Correct 3 ms 604 KB correct
50 Correct 7 ms 788 KB correct
51 Correct 16 ms 1116 KB correct
52 Correct 14 ms 1112 KB correct
53 Correct 13 ms 860 KB correct
54 Correct 18 ms 1372 KB correct
55 Correct 16 ms 1116 KB correct
56 Correct 16 ms 1232 KB correct
57 Correct 16 ms 1116 KB correct
58 Correct 0 ms 348 KB correct
59 Correct 0 ms 348 KB correct
60 Correct 140 ms 4444 KB correct
61 Correct 266 ms 7468 KB correct
62 Correct 281 ms 6996 KB correct
63 Correct 199 ms 6992 KB correct
64 Correct 236 ms 7136 KB correct
65 Correct 246 ms 7188 KB correct
66 Correct 264 ms 7472 KB correct
67 Correct 284 ms 7236 KB correct
68 Correct 261 ms 7244 KB correct
69 Correct 261 ms 7228 KB correct
70 Correct 0 ms 344 KB correct
71 Correct 234 ms 7004 KB correct
72 Correct 290 ms 7228 KB correct
73 Correct 1 ms 344 KB correct
74 Correct 267 ms 7320 KB correct
75 Correct 251 ms 6992 KB correct
76 Correct 83 ms 3096 KB correct
77 Correct 283 ms 7248 KB correct
78 Correct 260 ms 7212 KB correct
79 Correct 277 ms 7208 KB correct
80 Correct 254 ms 7068 KB correct
81 Correct 221 ms 6412 KB correct
82 Correct 251 ms 6992 KB correct
83 Correct 137 ms 4200 KB correct
84 Correct 137 ms 4956 KB correct
85 Correct 131 ms 4672 KB correct
86 Correct 82 ms 3208 KB correct
87 Correct 61 ms 2648 KB correct
88 Correct 50 ms 1884 KB correct
89 Correct 47 ms 1884 KB correct
90 Correct 41 ms 1628 KB correct
91 Correct 12 ms 600 KB correct
92 Correct 4 ms 348 KB correct
93 Correct 115 ms 4952 KB correct
94 Correct 89 ms 3444 KB correct
95 Correct 78 ms 3164 KB correct
96 Correct 43 ms 1628 KB correct
97 Correct 50 ms 1884 KB correct
98 Correct 61 ms 2648 KB correct
99 Correct 53 ms 1884 KB correct
100 Correct 18 ms 860 KB correct
101 Correct 5 ms 604 KB correct
102 Correct 107 ms 4000 KB correct
103 Correct 124 ms 4432 KB correct
104 Correct 108 ms 3924 KB correct
105 Correct 111 ms 3940 KB correct