oj.uz

Submission #301060

# Submission time Handle Problem Language Result Execution time Memory
301060 2020-09-17T16:07:32 Z JPN20 Simurgh (IOI17_simurgh) C++17
100 / 100
 443 ms 14584 KB 
#include "simurgh.h"
#include <bits/stdc++.h>
using namespace std;

// Input
int N, M, Q;
int A[1 << 18], B[1 << 18];
int C[509][509];
int idxs[509][509];
int ret[509][509];

// DFS Tree
bool used[1 << 18];
bool istree[1 << 18];
int par[1 << 18];
int wei[1 << 18];
int cl[1 << 18], cr[1 << 18];
vector<int> ord;
vector<int> X[1 << 18];

// DFS Tree Base
int BASE = 0;
vector<int> R;

void dfs(int pos) {
	used[pos] = true;
	cl[pos] = ord.size();
	ord.push_back(pos);
	for (int i : X[pos]) {
		if (used[i] == true) continue;
		par[i] = pos;
		istree[idxs[pos][i]] = true;
		dfs(i);
	}
	cr[pos] = ord.size() - 1;
}

vector<int> find_roads(int n, vector<int> u, vector<int> v) {
	// INPUT
	N = n;
	M = u.size();
	for (int i = 0; i < M; i++) A[i] = u[i];
	for (int i = 0; i < M; i++) B[i] = v[i];
	for (int i = 0; i < N; i++) {
		for (int j = 0; j < N; j++) idxs[i][j] = -1;
	}
	for (int i = 0; i < M; i++) idxs[A[i]][B[i]] = i;
	for (int i = 0; i < M; i++) idxs[B[i]][A[i]] = i;
	
	// DFSTR
	for (int i = 0; i < M; i++) X[A[i]].push_back(B[i]);
	for (int i = 0; i < M; i++) X[B[i]].push_back(A[i]);
	dfs(0);
	for (int i = 0; i < M; i++) {
		if (istree[i] == true) R.push_back(i);
	}
	BASE = count_common_roads(R); Q++;
	
	// PRTRH
	for (int i = 0; i < N; i++) wei[i] = -1;
	for (int i = 0; i < M; i++) {
		if (cl[A[i]] > cl[B[i]]) swap(A[i], B[i]);
		int cx = B[i];
		while (cx != A[i]) { C[A[i]][B[i]] = cx; C[B[i]][A[i]] = cx; cx = par[cx]; }
	}
	
	// TRHNT
	for (int i : ord) {
		if (i == 0 || wei[i] != -1) continue;
		int idx1 = -1;
		for (int j = 0; j < M; j++) {
			if (istree[j] == true) continue;
			if (!(cl[i] <= cl[B[j]] && cl[B[j]] <= cr[i])) continue;
			if (cl[par[i]] <= cl[A[j]]) continue;
			idx1 = j;
		}
		if (idx1 != -1) {
			int s0 = i, s1 = par[i], s2 = par[par[i]];
			vector<int> r1, r2;
			for (int j : R) { if (j != idxs[s0][s1]) r1.push_back(j); }
			for (int j : R) { if (j != idxs[s1][s2]) r2.push_back(j); }
			r1.push_back(idx1);
			r2.push_back(idx1);
			int p1 = count_common_roads(r1); Q++;
			int p2 = count_common_roads(r2); Q++;
			int eval = p2 - (BASE - wei[s1]);
			wei[i] = BASE - (p1 - eval);
		}
		else {
			int idx2 = -1, maxid = -1; vector<int> idx3;
			for (int j = 0; j < M; j++) {
				if (istree[j] == true) continue;
				if (!(cl[i] <= cl[B[j]] && cl[B[j]] <= cr[i])) continue;
				if (par[i] != A[j]) continue;
				idx3.push_back(j);
				if (maxid < cl[B[j]]) { maxid = cl[B[j]]; idx2 = j; }
			}
			if (idx2 != -1) {
				int cx = B[idx2];
				vector<pair<int, int>> vals;
				while (true) {
					vector<int> r;
					for (int j : R) { if (j != idxs[cx][par[cx]]) r.push_back(j); }
					r.push_back(idx2);
					vals.push_back(make_pair(cx, BASE - count_common_roads(r))); Q++;
					cx = par[cx];
					if (cx == A[idx2]) break;
				}
				int maxv = 0, minv = 0;
				for (int j = 0; j < (int)vals.size(); j++) maxv = max(maxv, vals[j].second);
				for (int j = 0; j < (int)vals.size(); j++) minv = min(minv, vals[j].second);
				for (int j = 0; j < (int)vals.size(); j++) wei[vals[j].first] = vals[j].second;
				if (maxv == 0 && minv == -1) {
					for (int j = 0; j < (int)vals.size(); j++) wei[vals[j].first] += 1;
				}
				if (maxv == 0 && minv == 0) {
					bool flg = false;
					for (int j : idx3) {
						vector<int> r;
						for (int k : R) { if (k != idxs[i][par[i]]) r.push_back(k); }
						r.push_back(j);
						int eval = BASE - count_common_roads(r); Q++;
						if (eval == -1) flg = true;
					}
					if (flg == false) {
						for (int j = 0; j < (int)vals.size(); j++) wei[vals[j].first] += 1;
					}
				}
			}
			else {
				wei[i] = 1;
			}
		}
	}
	
	// PRFNL
	for (int i = 1; i < N; i++) {
		ret[par[i]][i] = wei[i];
		ret[i][par[i]] = wei[i];
	}
	
	// FINAL
	for (int t = 2; t < ord.size(); t++) {
		int i = ord[t];
		vector<int> vec;
		for (int j = 0; j < M; j++) {
			if (istree[j] == true) continue;
			if (B[j] == i) vec.push_back(A[j]);
		}
		int cx = vec.size(), cnt = 0;
		while (cx >= 1) {
			if (true) {
				vector<int> r;
				vector<bool> uses(N, false);
				int ExpCost = BASE + cnt;
				for (int k = 0; k < (int)vec.size(); k++) r.push_back(idxs[vec[k]][i]);
				for (int k = 0; k < (int)vec.size(); k++) uses[C[vec[k]][i]] = true;
				for (int k = 1; k < N; k++) { if (uses[k] == true) ExpCost -= ret[k][par[k]]; }
				for (int k = 1; k < N; k++) { if (uses[k] == false) r.push_back(idxs[k][par[k]]); }
				int val = count_common_roads(r);
				if (val <= ExpCost) break;
			}
			int cl = 0, cr = cx, cm, maxn = -1;
			int pres = -1;
			for (int j = 0; j < 11; j++) {
				cm = (cl + cr) / 2;
				vector<int> r;
				vector<bool> uses(N, false);
				int ExpCost = BASE + cnt;
				for (int k = cm; k < (int)vec.size(); k++) r.push_back(idxs[vec[k]][i]);
				for (int k = cm; k < (int)vec.size(); k++) uses[C[vec[k]][i]] = true;
				for (int k = 1; k < N; k++) { if (uses[k] == true) ExpCost -= ret[k][par[k]]; }
				for (int k = 1; k < N; k++) { if (uses[k] == false) r.push_back(idxs[k][par[k]]); }
				int val = count_common_roads(r);
				if (val > ExpCost) { maxn = max(maxn, cm); cl = cm; }
				else { cr = cm; }
				if (pres == cm) break;
				pres = cm;
			}
			if (maxn == -1) break;
			cnt += 1;
			ret[i][vec[maxn]] = 1;
			ret[vec[maxn]][i] = 1;
			cx = maxn;
		}
	}
	
	// FLARE
	vector<int> FinalAns;
	for (int i = 0; i < M; i++) {
		if (ret[A[i]][B[i]] == 1) FinalAns.push_back(i);
	}
	return FinalAns;
}

Compilation message

simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:143:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  143 |  for (int t = 2; t < ord.size(); t++) {
      |                  ~~^~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 6528 KB correct
2 Correct 5 ms 6528 KB correct
3 Correct 5 ms 6528 KB correct
4 Correct 5 ms 6528 KB correct
5 Correct 5 ms 6528 KB correct
6 Correct 5 ms 6528 KB correct
7 Correct 5 ms 6528 KB correct
8 Correct 5 ms 6528 KB correct
9 Correct 5 ms 6528 KB correct
10 Correct 6 ms 6528 KB correct
11 Correct 5 ms 6528 KB correct
12 Correct 5 ms 6528 KB correct
13 Correct 7 ms 6656 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 6528 KB correct
2 Correct 5 ms 6528 KB correct
3 Correct 5 ms 6528 KB correct
4 Correct 5 ms 6528 KB correct
5 Correct 5 ms 6528 KB correct
6 Correct 5 ms 6528 KB correct
7 Correct 5 ms 6528 KB correct
8 Correct 5 ms 6528 KB correct
9 Correct 5 ms 6528 KB correct
10 Correct 6 ms 6528 KB correct
11 Correct 5 ms 6528 KB correct
12 Correct 5 ms 6528 KB correct
13 Correct 7 ms 6656 KB correct
14 Correct 7 ms 6912 KB correct
15 Correct 7 ms 6912 KB correct
16 Correct 7 ms 6912 KB correct
17 Correct 6 ms 6912 KB correct
18 Correct 6 ms 6912 KB correct
19 Correct 7 ms 6912 KB correct
20 Correct 7 ms 6912 KB correct
21 Correct 6 ms 6912 KB correct
22 Correct 6 ms 6912 KB correct
23 Correct 6 ms 6912 KB correct
24 Correct 6 ms 6912 KB correct
25 Correct 5 ms 6784 KB correct
26 Correct 6 ms 6912 KB correct
27 Correct 6 ms 6912 KB correct
28 Correct 6 ms 6912 KB correct
29 Correct 5 ms 6784 KB correct
30 Correct 6 ms 6912 KB correct
31 Correct 6 ms 6912 KB correct
32 Correct 6 ms 6912 KB correct
33 Correct 6 ms 6912 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 6528 KB correct
2 Correct 5 ms 6528 KB correct
3 Correct 5 ms 6528 KB correct
4 Correct 5 ms 6528 KB correct
5 Correct 5 ms 6528 KB correct
6 Correct 5 ms 6528 KB correct
7 Correct 5 ms 6528 KB correct
8 Correct 5 ms 6528 KB correct
9 Correct 5 ms 6528 KB correct
10 Correct 6 ms 6528 KB correct
11 Correct 5 ms 6528 KB correct
12 Correct 5 ms 6528 KB correct
13 Correct 7 ms 6656 KB correct
14 Correct 7 ms 6912 KB correct
15 Correct 7 ms 6912 KB correct
16 Correct 7 ms 6912 KB correct
17 Correct 6 ms 6912 KB correct
18 Correct 6 ms 6912 KB correct
19 Correct 7 ms 6912 KB correct
20 Correct 7 ms 6912 KB correct
21 Correct 6 ms 6912 KB correct
22 Correct 6 ms 6912 KB correct
23 Correct 6 ms 6912 KB correct
24 Correct 6 ms 6912 KB correct
25 Correct 5 ms 6784 KB correct
26 Correct 6 ms 6912 KB correct
27 Correct 6 ms 6912 KB correct
28 Correct 6 ms 6912 KB correct
29 Correct 5 ms 6784 KB correct
30 Correct 6 ms 6912 KB correct
31 Correct 6 ms 6912 KB correct
32 Correct 6 ms 6912 KB correct
33 Correct 6 ms 6912 KB correct
34 Correct 61 ms 8984 KB correct
35 Correct 59 ms 8860 KB correct
36 Correct 51 ms 8776 KB correct
37 Correct 17 ms 8064 KB correct
38 Correct 60 ms 8960 KB correct
39 Correct 56 ms 8832 KB correct
40 Correct 48 ms 8832 KB correct
41 Correct 59 ms 8952 KB correct
42 Correct 58 ms 8952 KB correct
43 Correct 32 ms 8576 KB correct
44 Correct 36 ms 8448 KB correct
45 Correct 32 ms 8448 KB correct
46 Correct 27 ms 8320 KB correct
47 Correct 21 ms 8192 KB correct
48 Correct 10 ms 7936 KB correct
49 Correct 16 ms 8064 KB correct
50 Correct 28 ms 8244 KB correct
51 Correct 39 ms 8444 KB correct
52 Correct 38 ms 8448 KB correct
53 Correct 39 ms 8440 KB correct
54 Correct 37 ms 8568 KB correct
55 Correct 34 ms 8448 KB correct
56 Correct 32 ms 8448 KB correct
57 Correct 35 ms 8448 KB correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 6528 KB correct
2 Correct 5 ms 6656 KB correct
3 Correct 204 ms 11828 KB correct
4 Correct 334 ms 13688 KB correct
5 Correct 351 ms 13816 KB correct
6 Correct 364 ms 13688 KB correct
7 Correct 373 ms 13820 KB correct
8 Correct 328 ms 13688 KB correct
9 Correct 344 ms 13816 KB correct
10 Correct 387 ms 13736 KB correct
11 Correct 347 ms 13728 KB correct
12 Correct 338 ms 13688 KB correct
13 Correct 5 ms 6528 KB correct
14 Correct 360 ms 13688 KB correct
15 Correct 351 ms 13656 KB correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 6528 KB correct
2 Correct 5 ms 6528 KB correct
3 Correct 5 ms 6528 KB correct
4 Correct 5 ms 6528 KB correct
5 Correct 5 ms 6528 KB correct
6 Correct 5 ms 6528 KB correct
7 Correct 5 ms 6528 KB correct
8 Correct 5 ms 6528 KB correct
9 Correct 5 ms 6528 KB correct
10 Correct 6 ms 6528 KB correct
11 Correct 5 ms 6528 KB correct
12 Correct 5 ms 6528 KB correct
13 Correct 7 ms 6656 KB correct
14 Correct 7 ms 6912 KB correct
15 Correct 7 ms 6912 KB correct
16 Correct 7 ms 6912 KB correct
17 Correct 6 ms 6912 KB correct
18 Correct 6 ms 6912 KB correct
19 Correct 7 ms 6912 KB correct
20 Correct 7 ms 6912 KB correct
21 Correct 6 ms 6912 KB correct
22 Correct 6 ms 6912 KB correct
23 Correct 6 ms 6912 KB correct
24 Correct 6 ms 6912 KB correct
25 Correct 5 ms 6784 KB correct
26 Correct 6 ms 6912 KB correct
27 Correct 6 ms 6912 KB correct
28 Correct 6 ms 6912 KB correct
29 Correct 5 ms 6784 KB correct
30 Correct 6 ms 6912 KB correct
31 Correct 6 ms 6912 KB correct
32 Correct 6 ms 6912 KB correct
33 Correct 6 ms 6912 KB correct
34 Correct 61 ms 8984 KB correct
35 Correct 59 ms 8860 KB correct
36 Correct 51 ms 8776 KB correct
37 Correct 17 ms 8064 KB correct
38 Correct 60 ms 8960 KB correct
39 Correct 56 ms 8832 KB correct
40 Correct 48 ms 8832 KB correct
41 Correct 59 ms 8952 KB correct
42 Correct 58 ms 8952 KB correct
43 Correct 32 ms 8576 KB correct
44 Correct 36 ms 8448 KB correct
45 Correct 32 ms 8448 KB correct
46 Correct 27 ms 8320 KB correct
47 Correct 21 ms 8192 KB correct
48 Correct 10 ms 7936 KB correct
49 Correct 16 ms 8064 KB correct
50 Correct 28 ms 8244 KB correct
51 Correct 39 ms 8444 KB correct
52 Correct 38 ms 8448 KB correct
53 Correct 39 ms 8440 KB correct
54 Correct 37 ms 8568 KB correct
55 Correct 34 ms 8448 KB correct
56 Correct 32 ms 8448 KB correct
57 Correct 35 ms 8448 KB correct
58 Correct 5 ms 6528 KB correct
59 Correct 5 ms 6656 KB correct
60 Correct 204 ms 11828 KB correct
61 Correct 334 ms 13688 KB correct
62 Correct 351 ms 13816 KB correct
63 Correct 364 ms 13688 KB correct
64 Correct 373 ms 13820 KB correct
65 Correct 328 ms 13688 KB correct
66 Correct 344 ms 13816 KB correct
67 Correct 387 ms 13736 KB correct
68 Correct 347 ms 13728 KB correct
69 Correct 338 ms 13688 KB correct
70 Correct 5 ms 6528 KB correct
71 Correct 360 ms 13688 KB correct
72 Correct 351 ms 13656 KB correct
73 Correct 5 ms 6528 KB correct
74 Correct 364 ms 13856 KB correct
75 Correct 443 ms 14564 KB correct
76 Correct 144 ms 11000 KB correct
77 Correct 344 ms 14548 KB correct
78 Correct 341 ms 14564 KB correct
79 Correct 343 ms 14584 KB correct
80 Correct 340 ms 14456 KB correct
81 Correct 344 ms 14072 KB correct
82 Correct 342 ms 14456 KB correct
83 Correct 222 ms 12280 KB correct
84 Correct 179 ms 12796 KB correct
85 Correct 162 ms 12536 KB correct
86 Correct 128 ms 11512 KB correct
87 Correct 107 ms 11000 KB correct
88 Correct 92 ms 10688 KB correct
89 Correct 87 ms 10488 KB correct
90 Correct 81 ms 10488 KB correct
91 Correct 43 ms 9728 KB correct
92 Correct 26 ms 9600 KB correct
93 Correct 269 ms 12536 KB correct
94 Correct 185 ms 11512 KB correct
95 Correct 192 ms 11512 KB correct
96 Correct 108 ms 10488 KB correct
97 Correct 145 ms 10616 KB correct
98 Correct 168 ms 11012 KB correct
99 Correct 152 ms 10616 KB correct
100 Correct 64 ms 9856 KB correct
101 Correct 33 ms 9600 KB correct
102 Correct 169 ms 12224 KB correct
103 Correct 175 ms 12152 KB correct
104 Correct 174 ms 12152 KB correct
105 Correct 169 ms 12280 KB correct