Submission #23984

# Submission time Handle Problem Language Result Execution time Memory
23984 2017-05-28T14:51:54 Z gs14004 Port Facility (JOI17_port_facility) C++11
100 / 100
2863 ms 125900 KB
#include <bits/stdc++.h>
using namespace std;
typedef long long lint;
typedef pair<lint, lint> pi;
const int mod = 1e9 + 7;

struct seg2{
	int tree[4200000], lim;
	void init(int n){
		for(lim = 1; lim <= n; lim <<= 1);
		fill(tree, tree + 2 * lim + 1, -1e9);
	}
	void add(int x, int v){
		x += lim;
		tree[x] = v;
		while(x > 1){
			x >>= 1;
			tree[x] = max(tree[2*x], tree[2*x+1]);
		}
	}
	int query(int s, int e){
		s += lim;
		e += lim;
		int ret = -1e9;
		while(s < e){
			if(s%2 == 1) ret = max(ret, tree[s++]);
			if(e%2 == 0) ret = max(ret, tree[e--]);
			s >>= 1;
			e >>= 1;
		}
		if(s == e) ret = max(ret, tree[s]);
		return ret;
	}
}seg1, seg2;

int n, s[1000005], e[1000005];
int idx[2000005];

int col[1000005];

void dfs(int x, int c){
//	fprintf(stderr, "%d\n", x);
	col[x] = c;
	while(1){
		int t = seg1.query(s[x] + 1, e[x] - 1);
		if(t <= e[x]) break;
		int v = idx[t];
		seg1.add(s[v], -1);
		seg2.add(e[v], -1e9);
		dfs(v, 3-c);
	}
	while(1){
		int t = -seg2.query(s[x] + 1, e[x] - 1);
		if(t >= s[x]) break;
		int v = idx[t];
		seg1.add(s[v], -1);
		seg2.add(e[v], -1e9);
		dfs(v, 3-c);
	}
}

bool solve(vector<pi> &v){
	sort(v.begin(), v.end());
	stack<pi> stk;
	for(int i=0; i<v.size(); i++){
		while(!stk.empty() && stk.top().second < v[i].first){
			stk.pop();
		}
		if(!stk.empty() && stk.top().second > v[i].first && stk.top().second < v[i].second){
			return 0;
		}
		stk.push(v[i]);
	}
	return 1;
}
int main(){
	scanf("%d",&n);
	seg1.init(2*n);
	seg2.init(2*n);
	for(int i=0; i<n; i++){
		scanf("%d %d",&s[i],&e[i]);
		idx[s[i]] = i;
		idx[e[i]] = i;
		seg1.add(s[i], e[i]);
		seg2.add(e[i], -s[i]);
	}
	lint ans = 1;
	for(int i=1; i<=2*n; i++){
		if(!col[idx[i]]){
			seg1.add(s[idx[i]], -1);
			seg2.add(e[idx[i]], -1e9);
			dfs(idx[i], 1);
			ans *= 2;
			ans %= mod;
		}
	}
	vector<pi> l, r;
	for(int i=0; i<n; i++){
		if(col[i] == 1) l.push_back(pi(s[i], e[i]));
		else r.push_back(pi(s[i], e[i]));
	}
	if(!solve(l) || !solve(r)) ans = 0;
	cout << ans;
}

Compilation message

port_facility.cpp: In function 'bool solve(std::vector<std::pair<long long int, long long int> >&)':
port_facility.cpp:65:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<v.size(); i++){
                ^
port_facility.cpp: In function 'int main()':
port_facility.cpp:77:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
port_facility.cpp:81:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&s[i],&e[i]);
                             ^
# Verdict Execution time Memory Grader output
1 Correct 0 ms 54368 KB Output is correct
2 Correct 0 ms 54368 KB Output is correct
3 Correct 0 ms 54368 KB Output is correct
4 Correct 0 ms 54368 KB Output is correct
5 Correct 0 ms 54368 KB Output is correct
6 Correct 0 ms 54368 KB Output is correct
7 Correct 0 ms 54368 KB Output is correct
8 Correct 0 ms 54368 KB Output is correct
9 Correct 0 ms 54368 KB Output is correct
10 Correct 0 ms 54368 KB Output is correct
11 Correct 0 ms 54368 KB Output is correct
12 Correct 0 ms 54368 KB Output is correct
13 Correct 0 ms 54368 KB Output is correct
14 Correct 0 ms 54368 KB Output is correct
15 Correct 0 ms 54368 KB Output is correct
16 Correct 0 ms 54368 KB Output is correct
17 Correct 0 ms 54368 KB Output is correct
18 Correct 0 ms 54368 KB Output is correct
19 Correct 0 ms 54368 KB Output is correct
20 Correct 0 ms 54368 KB Output is correct
21 Correct 0 ms 54368 KB Output is correct
22 Correct 0 ms 54368 KB Output is correct
23 Correct 0 ms 54368 KB Output is correct
24 Correct 0 ms 54368 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 0 ms 54368 KB Output is correct
2 Correct 0 ms 54368 KB Output is correct
3 Correct 0 ms 54368 KB Output is correct
4 Correct 0 ms 54368 KB Output is correct
5 Correct 0 ms 54368 KB Output is correct
6 Correct 0 ms 54368 KB Output is correct
7 Correct 0 ms 54368 KB Output is correct
8 Correct 0 ms 54368 KB Output is correct
9 Correct 0 ms 54368 KB Output is correct
10 Correct 0 ms 54368 KB Output is correct
11 Correct 0 ms 54368 KB Output is correct
12 Correct 0 ms 54368 KB Output is correct
13 Correct 0 ms 54368 KB Output is correct
14 Correct 0 ms 54368 KB Output is correct
15 Correct 0 ms 54368 KB Output is correct
16 Correct 0 ms 54368 KB Output is correct
17 Correct 0 ms 54368 KB Output is correct
18 Correct 0 ms 54368 KB Output is correct
19 Correct 0 ms 54368 KB Output is correct
20 Correct 0 ms 54368 KB Output is correct
21 Correct 0 ms 54368 KB Output is correct
22 Correct 0 ms 54368 KB Output is correct
23 Correct 0 ms 54368 KB Output is correct
24 Correct 0 ms 54368 KB Output is correct
25 Correct 0 ms 54528 KB Output is correct
26 Correct 0 ms 54528 KB Output is correct
27 Correct 0 ms 54528 KB Output is correct
28 Correct 0 ms 54528 KB Output is correct
29 Correct 0 ms 54528 KB Output is correct
30 Correct 0 ms 54528 KB Output is correct
31 Correct 0 ms 54520 KB Output is correct
32 Correct 0 ms 54528 KB Output is correct
33 Correct 0 ms 54528 KB Output is correct
34 Correct 3 ms 54520 KB Output is correct
35 Correct 0 ms 54508 KB Output is correct
36 Correct 0 ms 54508 KB Output is correct
37 Correct 0 ms 54500 KB Output is correct
38 Correct 0 ms 54368 KB Output is correct
39 Correct 0 ms 54504 KB Output is correct
40 Correct 0 ms 54508 KB Output is correct
41 Correct 0 ms 54368 KB Output is correct
42 Correct 0 ms 54368 KB Output is correct
43 Correct 0 ms 54368 KB Output is correct
44 Correct 0 ms 54368 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 0 ms 54368 KB Output is correct
2 Correct 0 ms 54368 KB Output is correct
3 Correct 0 ms 54368 KB Output is correct
4 Correct 0 ms 54368 KB Output is correct
5 Correct 0 ms 54368 KB Output is correct
6 Correct 0 ms 54368 KB Output is correct
7 Correct 0 ms 54368 KB Output is correct
8 Correct 0 ms 54368 KB Output is correct
9 Correct 0 ms 54368 KB Output is correct
10 Correct 0 ms 54368 KB Output is correct
11 Correct 0 ms 54368 KB Output is correct
12 Correct 0 ms 54368 KB Output is correct
13 Correct 0 ms 54368 KB Output is correct
14 Correct 0 ms 54368 KB Output is correct
15 Correct 0 ms 54368 KB Output is correct
16 Correct 0 ms 54368 KB Output is correct
17 Correct 0 ms 54368 KB Output is correct
18 Correct 0 ms 54368 KB Output is correct
19 Correct 0 ms 54368 KB Output is correct
20 Correct 0 ms 54368 KB Output is correct
21 Correct 0 ms 54368 KB Output is correct
22 Correct 0 ms 54368 KB Output is correct
23 Correct 0 ms 54368 KB Output is correct
24 Correct 0 ms 54368 KB Output is correct
25 Correct 0 ms 54528 KB Output is correct
26 Correct 0 ms 54528 KB Output is correct
27 Correct 0 ms 54528 KB Output is correct
28 Correct 0 ms 54528 KB Output is correct
29 Correct 0 ms 54528 KB Output is correct
30 Correct 0 ms 54528 KB Output is correct
31 Correct 0 ms 54520 KB Output is correct
32 Correct 0 ms 54528 KB Output is correct
33 Correct 0 ms 54528 KB Output is correct
34 Correct 3 ms 54520 KB Output is correct
35 Correct 0 ms 54508 KB Output is correct
36 Correct 0 ms 54508 KB Output is correct
37 Correct 0 ms 54500 KB Output is correct
38 Correct 0 ms 54368 KB Output is correct
39 Correct 0 ms 54504 KB Output is correct
40 Correct 0 ms 54508 KB Output is correct
41 Correct 0 ms 54368 KB Output is correct
42 Correct 0 ms 54368 KB Output is correct
43 Correct 0 ms 54368 KB Output is correct
44 Correct 0 ms 54368 KB Output is correct
45 Correct 119 ms 57632 KB Output is correct
46 Correct 139 ms 58268 KB Output is correct
47 Correct 156 ms 57196 KB Output is correct
48 Correct 149 ms 58252 KB Output is correct
49 Correct 109 ms 57288 KB Output is correct
50 Correct 109 ms 58084 KB Output is correct
51 Correct 146 ms 58072 KB Output is correct
52 Correct 99 ms 57524 KB Output is correct
53 Correct 103 ms 58096 KB Output is correct
54 Correct 129 ms 61576 KB Output is correct
55 Correct 159 ms 59232 KB Output is correct
56 Correct 123 ms 59232 KB Output is correct
57 Correct 79 ms 57016 KB Output is correct
58 Correct 109 ms 57524 KB Output is correct
59 Correct 106 ms 57780 KB Output is correct
60 Correct 129 ms 58548 KB Output is correct
61 Correct 126 ms 57100 KB Output is correct
62 Correct 96 ms 57780 KB Output is correct
63 Correct 129 ms 58564 KB Output is correct
64 Correct 126 ms 57080 KB Output is correct
65 Correct 196 ms 61644 KB Output is correct
66 Correct 193 ms 61644 KB Output is correct
67 Correct 159 ms 59452 KB Output is correct
68 Correct 146 ms 59508 KB Output is correct
69 Correct 133 ms 60552 KB Output is correct
70 Correct 143 ms 60548 KB Output is correct
71 Correct 159 ms 61808 KB Output is correct
72 Correct 146 ms 61856 KB Output is correct
73 Correct 116 ms 61592 KB Output is correct
74 Correct 103 ms 61596 KB Output is correct
75 Correct 123 ms 61664 KB Output is correct
76 Correct 119 ms 61580 KB Output is correct
77 Correct 96 ms 61576 KB Output is correct
78 Correct 136 ms 58124 KB Output is correct
79 Correct 119 ms 57664 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 0 ms 54368 KB Output is correct
2 Correct 0 ms 54368 KB Output is correct
3 Correct 0 ms 54368 KB Output is correct
4 Correct 0 ms 54368 KB Output is correct
5 Correct 0 ms 54368 KB Output is correct
6 Correct 0 ms 54368 KB Output is correct
7 Correct 0 ms 54368 KB Output is correct
8 Correct 0 ms 54368 KB Output is correct
9 Correct 0 ms 54368 KB Output is correct
10 Correct 0 ms 54368 KB Output is correct
11 Correct 0 ms 54368 KB Output is correct
12 Correct 0 ms 54368 KB Output is correct
13 Correct 0 ms 54368 KB Output is correct
14 Correct 0 ms 54368 KB Output is correct
15 Correct 0 ms 54368 KB Output is correct
16 Correct 0 ms 54368 KB Output is correct
17 Correct 0 ms 54368 KB Output is correct
18 Correct 0 ms 54368 KB Output is correct
19 Correct 0 ms 54368 KB Output is correct
20 Correct 0 ms 54368 KB Output is correct
21 Correct 0 ms 54368 KB Output is correct
22 Correct 0 ms 54368 KB Output is correct
23 Correct 0 ms 54368 KB Output is correct
24 Correct 0 ms 54368 KB Output is correct
25 Correct 0 ms 54528 KB Output is correct
26 Correct 0 ms 54528 KB Output is correct
27 Correct 0 ms 54528 KB Output is correct
28 Correct 0 ms 54528 KB Output is correct
29 Correct 0 ms 54528 KB Output is correct
30 Correct 0 ms 54528 KB Output is correct
31 Correct 0 ms 54520 KB Output is correct
32 Correct 0 ms 54528 KB Output is correct
33 Correct 0 ms 54528 KB Output is correct
34 Correct 3 ms 54520 KB Output is correct
35 Correct 0 ms 54508 KB Output is correct
36 Correct 0 ms 54508 KB Output is correct
37 Correct 0 ms 54500 KB Output is correct
38 Correct 0 ms 54368 KB Output is correct
39 Correct 0 ms 54504 KB Output is correct
40 Correct 0 ms 54508 KB Output is correct
41 Correct 0 ms 54368 KB Output is correct
42 Correct 0 ms 54368 KB Output is correct
43 Correct 0 ms 54368 KB Output is correct
44 Correct 0 ms 54368 KB Output is correct
45 Correct 119 ms 57632 KB Output is correct
46 Correct 139 ms 58268 KB Output is correct
47 Correct 156 ms 57196 KB Output is correct
48 Correct 149 ms 58252 KB Output is correct
49 Correct 109 ms 57288 KB Output is correct
50 Correct 109 ms 58084 KB Output is correct
51 Correct 146 ms 58072 KB Output is correct
52 Correct 99 ms 57524 KB Output is correct
53 Correct 103 ms 58096 KB Output is correct
54 Correct 129 ms 61576 KB Output is correct
55 Correct 159 ms 59232 KB Output is correct
56 Correct 123 ms 59232 KB Output is correct
57 Correct 79 ms 57016 KB Output is correct
58 Correct 109 ms 57524 KB Output is correct
59 Correct 106 ms 57780 KB Output is correct
60 Correct 129 ms 58548 KB Output is correct
61 Correct 126 ms 57100 KB Output is correct
62 Correct 96 ms 57780 KB Output is correct
63 Correct 129 ms 58564 KB Output is correct
64 Correct 126 ms 57080 KB Output is correct
65 Correct 196 ms 61644 KB Output is correct
66 Correct 193 ms 61644 KB Output is correct
67 Correct 159 ms 59452 KB Output is correct
68 Correct 146 ms 59508 KB Output is correct
69 Correct 133 ms 60552 KB Output is correct
70 Correct 143 ms 60548 KB Output is correct
71 Correct 159 ms 61808 KB Output is correct
72 Correct 146 ms 61856 KB Output is correct
73 Correct 116 ms 61592 KB Output is correct
74 Correct 103 ms 61596 KB Output is correct
75 Correct 123 ms 61664 KB Output is correct
76 Correct 119 ms 61580 KB Output is correct
77 Correct 96 ms 61576 KB Output is correct
78 Correct 136 ms 58124 KB Output is correct
79 Correct 119 ms 57664 KB Output is correct
80 Correct 2009 ms 90076 KB Output is correct
81 Correct 1969 ms 89512 KB Output is correct
82 Correct 1933 ms 87932 KB Output is correct
83 Correct 1949 ms 89556 KB Output is correct
84 Correct 2043 ms 90096 KB Output is correct
85 Correct 1859 ms 87996 KB Output is correct
86 Correct 1873 ms 89588 KB Output is correct
87 Correct 1546 ms 79028 KB Output is correct
88 Correct 1806 ms 87460 KB Output is correct
89 Correct 1986 ms 121748 KB Output is correct
90 Correct 1993 ms 98248 KB Output is correct
91 Correct 2136 ms 98248 KB Output is correct
92 Correct 1629 ms 74936 KB Output is correct
93 Correct 1513 ms 79028 KB Output is correct
94 Correct 1773 ms 83124 KB Output is correct
95 Correct 1733 ms 87308 KB Output is correct
96 Correct 1753 ms 87288 KB Output is correct
97 Correct 1676 ms 87220 KB Output is correct
98 Correct 1729 ms 87308 KB Output is correct
99 Correct 1813 ms 87308 KB Output is correct
100 Correct 2863 ms 121688 KB Output is correct
101 Correct 2783 ms 121684 KB Output is correct
102 Correct 2066 ms 102480 KB Output is correct
103 Correct 2025 ms 102448 KB Output is correct
104 Correct 2096 ms 110688 KB Output is correct
105 Correct 2069 ms 110712 KB Output is correct
106 Correct 2066 ms 125896 KB Output is correct
107 Correct 2136 ms 125900 KB Output is correct
108 Correct 1956 ms 121112 KB Output is correct
109 Correct 1963 ms 121112 KB Output is correct
110 Correct 1796 ms 121688 KB Output is correct
111 Correct 1639 ms 121688 KB Output is correct
112 Correct 1656 ms 121688 KB Output is correct
113 Correct 1946 ms 87592 KB Output is correct
114 Correct 1996 ms 89428 KB Output is correct