#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 |