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Submission #24458

# Submission time Handle Problem Language Result Execution time Memory
24458 2017-06-08T10:35:30 Z gs14004 Roller Coaster Railroad (IOI16_railroad) C++11
100 / 100
 326 ms 22932 KB 
#include "railroad.h"
#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> pi;
typedef long long lint;

struct disj{
	int pa[400005];
	void init(int n){
		for(int i=0; i<=n; i++) pa[i] = i;
	}
	int find(int x){
		return pa[x] = (pa[x] == x ? x : find(pa[x]));
	}
	bool uni(int p, int q){
		p = find(p);
		q = find(q);
		if(p == q) return 0;
		pa[q] = p; return 1;
	}
}disj;

struct edg{
	int s, e, x;
	bool operator<(const edg &e)const{
		return x < e.x;
	}
};

int dx[400005];

long long plan_roller_coaster(std::vector<int> s, std::vector<int> t) {
	vector<int> crd;
	int n = (int) s.size();
	for(int i=0; i<n; i++){
		crd.push_back(s[i]);
		crd.push_back(t[i]);
	}
	sort(crd.begin(), crd.end());
	crd.resize(unique(crd.begin(), crd.end()) - crd.begin());
	disj.init(crd.size());
	for(int i=0; i<n; i++){
		s[i] = lower_bound(crd.begin(), crd.end(), s[i]) - crd.begin();
		t[i] = lower_bound(crd.begin(), crd.end(), t[i]) - crd.begin();
		dx[s[i]]++;
		dx[t[i]]--;
		disj.uni(s[i], t[i]);
	}
	int cur = 1;
	lint ans = 0;
	vector<edg> v;
	for(int i=crd.size() - 1; i>=0; i--){
		cur += dx[i];
		if(cur < 0){
			ans += -1ll * cur * (crd[i] - crd[i-1]);
			dx[i-1] += cur;
			disj.uni(i-1, i);
			cur = 0;
		}
		if(cur > 0 && i-1 < crd.size()) disj.uni(i, i-1);
		else if(cur == 0) v.push_back({i, i-1, crd[i] - crd[i-1]});
	}
	sort(v.begin(), v.end());
	for(auto &i : v){
		if(disj.uni(i.s, i.e)) ans += i.x;
	}
	return ans;
}

Compilation message

railroad.cpp: In function 'long long int plan_roller_coaster(std::vector<int>, std::vector<int>)':
railroad.cpp:60:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(cur > 0 && i-1 < crd.size()) disj.uni(i, i-1);
                     ^

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 5156 KB n = 2
2 Correct 0 ms 5156 KB n = 2
3 Correct 0 ms 5156 KB n = 2
4 Correct 0 ms 5156 KB n = 2
5 Correct 0 ms 5156 KB n = 2
6 Correct 0 ms 5156 KB n = 2
7 Correct 0 ms 5156 KB n = 3
8 Correct 0 ms 5156 KB n = 3
9 Correct 0 ms 5156 KB n = 3
10 Correct 0 ms 5156 KB n = 8
11 Correct 0 ms 5156 KB n = 8
12 Correct 0 ms 5156 KB n = 8
13 Correct 0 ms 5156 KB n = 8
14 Correct 0 ms 5156 KB n = 8
15 Correct 0 ms 5156 KB n = 8
16 Correct 0 ms 5156 KB n = 8
17 Correct 0 ms 5156 KB n = 8
18 Correct 0 ms 5156 KB n = 8
19 Correct 0 ms 5156 KB n = 3
20 Correct 0 ms 5156 KB n = 7
21 Correct 0 ms 5156 KB n = 8
22 Correct 0 ms 5156 KB n = 8
23 Correct 0 ms 5156 KB n = 8
24 Correct 0 ms 5156 KB n = 8
25 Correct 0 ms 5156 KB n = 8

Subtask #2
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 5156 KB n = 2
2 Correct 0 ms 5156 KB n = 2
3 Correct 0 ms 5156 KB n = 2
4 Correct 0 ms 5156 KB n = 2
5 Correct 0 ms 5156 KB n = 2
6 Correct 0 ms 5156 KB n = 2
7 Correct 0 ms 5156 KB n = 3
8 Correct 0 ms 5156 KB n = 3
9 Correct 0 ms 5156 KB n = 3
10 Correct 0 ms 5156 KB n = 8
11 Correct 0 ms 5156 KB n = 8
12 Correct 0 ms 5156 KB n = 8
13 Correct 0 ms 5156 KB n = 8
14 Correct 0 ms 5156 KB n = 8
15 Correct 0 ms 5156 KB n = 8
16 Correct 0 ms 5156 KB n = 8
17 Correct 0 ms 5156 KB n = 8
18 Correct 0 ms 5156 KB n = 8
19 Correct 0 ms 5156 KB n = 3
20 Correct 0 ms 5156 KB n = 7
21 Correct 0 ms 5156 KB n = 8
22 Correct 0 ms 5156 KB n = 8
23 Correct 0 ms 5156 KB n = 8
24 Correct 0 ms 5156 KB n = 8
25 Correct 0 ms 5156 KB n = 8
26 Correct 0 ms 5156 KB n = 8
27 Correct 0 ms 5156 KB n = 8
28 Correct 0 ms 5156 KB n = 8
29 Correct 0 ms 5156 KB n = 16
30 Correct 0 ms 5156 KB n = 16
31 Correct 0 ms 5156 KB n = 16
32 Correct 0 ms 5156 KB n = 16
33 Correct 0 ms 5156 KB n = 16
34 Correct 0 ms 5156 KB n = 16
35 Correct 0 ms 5156 KB n = 16
36 Correct 0 ms 5156 KB n = 15
37 Correct 0 ms 5156 KB n = 8
38 Correct 0 ms 5156 KB n = 16
39 Correct 0 ms 5156 KB n = 16
40 Correct 0 ms 5156 KB n = 9
41 Correct 0 ms 5156 KB n = 16
42 Correct 0 ms 5156 KB n = 16
43 Correct 0 ms 5156 KB n = 16
44 Correct 0 ms 5156 KB n = 9
45 Correct 0 ms 5156 KB n = 15
46 Correct 0 ms 5156 KB n = 16
47 Correct 0 ms 5156 KB n = 16
48 Correct 0 ms 5156 KB n = 16

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 246 ms 11448 KB n = 199999
2 Correct 263 ms 21180 KB n = 199991
3 Correct 326 ms 21180 KB n = 199993
4 Correct 163 ms 10696 KB n = 152076
5 Correct 109 ms 8248 KB n = 93249
6 Correct 206 ms 11448 KB n = 199910
7 Correct 223 ms 11448 KB n = 199999
8 Correct 216 ms 11448 KB n = 199997
9 Correct 193 ms 11000 KB n = 171294
10 Correct 163 ms 10520 KB n = 140872
11 Correct 189 ms 11448 KB n = 199886
12 Correct 236 ms 11448 KB n = 199996
13 Correct 189 ms 11448 KB n = 200000
14 Correct 219 ms 16572 KB n = 199998
15 Correct 203 ms 16572 KB n = 200000
16 Correct 219 ms 16572 KB n = 199998
17 Correct 263 ms 22928 KB n = 200000
18 Correct 206 ms 16412 KB n = 190000
19 Correct 176 ms 11096 KB n = 177777
20 Correct 89 ms 8344 KB n = 100000
21 Correct 243 ms 11448 KB n = 200000
22 Correct 263 ms 16572 KB n = 200000
23 Correct 263 ms 16572 KB n = 200000

Subtask #4
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 5156 KB n = 2
2 Correct 0 ms 5156 KB n = 2
3 Correct 0 ms 5156 KB n = 2
4 Correct 0 ms 5156 KB n = 2
5 Correct 0 ms 5156 KB n = 2
6 Correct 0 ms 5156 KB n = 2
7 Correct 0 ms 5156 KB n = 3
8 Correct 0 ms 5156 KB n = 3
9 Correct 0 ms 5156 KB n = 3
10 Correct 0 ms 5156 KB n = 8
11 Correct 0 ms 5156 KB n = 8
12 Correct 0 ms 5156 KB n = 8
13 Correct 0 ms 5156 KB n = 8
14 Correct 0 ms 5156 KB n = 8
15 Correct 0 ms 5156 KB n = 8
16 Correct 0 ms 5156 KB n = 8
17 Correct 0 ms 5156 KB n = 8
18 Correct 0 ms 5156 KB n = 8
19 Correct 0 ms 5156 KB n = 3
20 Correct 0 ms 5156 KB n = 7
21 Correct 0 ms 5156 KB n = 8
22 Correct 0 ms 5156 KB n = 8
23 Correct 0 ms 5156 KB n = 8
24 Correct 0 ms 5156 KB n = 8
25 Correct 0 ms 5156 KB n = 8
26 Correct 0 ms 5156 KB n = 8
27 Correct 0 ms 5156 KB n = 8
28 Correct 0 ms 5156 KB n = 8
29 Correct 0 ms 5156 KB n = 16
30 Correct 0 ms 5156 KB n = 16
31 Correct 0 ms 5156 KB n = 16
32 Correct 0 ms 5156 KB n = 16
33 Correct 0 ms 5156 KB n = 16
34 Correct 0 ms 5156 KB n = 16
35 Correct 0 ms 5156 KB n = 16
36 Correct 0 ms 5156 KB n = 15
37 Correct 0 ms 5156 KB n = 8
38 Correct 0 ms 5156 KB n = 16
39 Correct 0 ms 5156 KB n = 16
40 Correct 0 ms 5156 KB n = 9
41 Correct 0 ms 5156 KB n = 16
42 Correct 0 ms 5156 KB n = 16
43 Correct 0 ms 5156 KB n = 16
44 Correct 0 ms 5156 KB n = 9
45 Correct 0 ms 5156 KB n = 15
46 Correct 0 ms 5156 KB n = 16
47 Correct 0 ms 5156 KB n = 16
48 Correct 0 ms 5156 KB n = 16
49 Correct 246 ms 11448 KB n = 199999
50 Correct 263 ms 21180 KB n = 199991
51 Correct 326 ms 21180 KB n = 199993
52 Correct 163 ms 10696 KB n = 152076
53 Correct 109 ms 8248 KB n = 93249
54 Correct 206 ms 11448 KB n = 199910
55 Correct 223 ms 11448 KB n = 199999
56 Correct 216 ms 11448 KB n = 199997
57 Correct 193 ms 11000 KB n = 171294
58 Correct 163 ms 10520 KB n = 140872
59 Correct 189 ms 11448 KB n = 199886
60 Correct 236 ms 11448 KB n = 199996
61 Correct 189 ms 11448 KB n = 200000
62 Correct 219 ms 16572 KB n = 199998
63 Correct 203 ms 16572 KB n = 200000
64 Correct 219 ms 16572 KB n = 199998
65 Correct 263 ms 22928 KB n = 200000
66 Correct 206 ms 16412 KB n = 190000
67 Correct 176 ms 11096 KB n = 177777
68 Correct 89 ms 8344 KB n = 100000
69 Correct 243 ms 11448 KB n = 200000
70 Correct 263 ms 16572 KB n = 200000
71 Correct 263 ms 16572 KB n = 200000
72 Correct 213 ms 11448 KB n = 200000
73 Correct 243 ms 13496 KB n = 200000
74 Correct 313 ms 21180 KB n = 200000
75 Correct 256 ms 21180 KB n = 200000
76 Correct 196 ms 11448 KB n = 200000
77 Correct 186 ms 11448 KB n = 200000
78 Correct 209 ms 16572 KB n = 200000
79 Correct 193 ms 11192 KB n = 184307
80 Correct 73 ms 7976 KB n = 76040
81 Correct 196 ms 11448 KB n = 199981
82 Correct 203 ms 11448 KB n = 199994
83 Correct 186 ms 11448 KB n = 199996
84 Correct 226 ms 16572 KB n = 199998
85 Correct 223 ms 16572 KB n = 200000
86 Correct 223 ms 16572 KB n = 199998
87 Correct 256 ms 22932 KB n = 200000
88 Correct 239 ms 16716 KB n = 200000
89 Correct 246 ms 11448 KB n = 200000
90 Correct 199 ms 11448 KB n = 200000
91 Correct 276 ms 16572 KB n = 200000
92 Correct 239 ms 16572 KB n = 200000