/* Bismillahir Rahmanir Rahim */
#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> pii;
const int N = 2000005;
const int oo = 1e9;
void scanF(int &x){
register int c = getchar_unlocked();
x = 0;
for(;(c<48 || c>57);c = getchar_unlocked());
for(;c>47 && c<58;c = getchar_unlocked()) {x = (x<<1) + (x<<3) + c - 48;}
}
int n, st[N], en[N];
int lf[N], rf[N], idx[N];
int col[N], vis[N];
struct segtree{
int n;
pii mn[2*N], mx[2*N];
void build(int _n){
n = 2 * _n;
for(int i = 1; i <= n; i++){
mn[i + n - 1] = {lf[i], idx[i]};
mx[i + n - 1] = {rf[i], idx[i]};
}
for(int i = n - 1; i > 0; --i){
mn[i] = min(mn[i << 1], mn[i << 1 | 1]);
mx[i] = max(mx[i << 1], mx[i << 1 | 1]);
}
}
void modify(int pos){
pos = pos - 1 + n;
mn[pos] = {+oo, +oo};
mx[pos] = {-oo, -oo};
while(pos > 1){
mn[pos >> 1] = min(mn[pos], mn[pos ^ 1]);
mx[pos >> 1] = max(mx[pos], mx[pos ^ 1]);
pos >>= 1;
}
}
pii query_max(int l, int r){;
--l;
pii ret = {-oo, -oo};
for(l += n, r += n; l < r; l >>= 1, r >>= 1){
if(l & 1) ret = max(ret, mx[l++]);
if(r & 1) ret = max(ret, mx[--r]);
}
return ret;
}
pii query_min(int l, int r){;
--l;
pii ret = {+oo, +oo};
for(l += n, r += n; l < r; l >>= 1, r >>= 1){
if(l & 1) ret = min(ret, mn[l++]);
if(r & 1) ret = min(ret, mn[--r]);
}
return ret;
}
} tree;
void dfs(int at){
vis[at] = 1;
tree.modify(st[at]);
tree.modify(en[at]);
while(1){
pii f = tree.query_min(st[at], en[at]);
if(f.first >= st[at]) break;
col[f.second] = col[at] ^ 1;
dfs(f.second);
}
while(1){
pii f = tree.query_max(st[at], en[at]);
if(f.first <= en[at]) break;
col[f.second] = col[at] ^ 1;
dfs(f.second);
}
}
int t[2*N], nn;
void modify(int pos, int val){
pos = pos - 1 + nn;
t[pos] ^= (1 << val);
while(pos > 1){
t[pos >> 1] = t[pos] | t[pos ^ 1];
pos >>= 1;
}
}
int get(int l, int r){;
--l;
int ret = 0;
for(l += nn, r += nn; l < r; l >>= 1, r >>= 1){
if(l & 1) ret |= t[l++];
if(r & 1) ret |= t[--r];
}
return ret;
}
bool check(){
for(int i = 1; i <= n + n; i++){
if(st[idx[i]] == i) modify(st[idx[i]], col[idx[i]]);
else{
int g1 = get(st[idx[i]]+1, en[idx[i]]);
int g2 = 1 << col[idx[i]];
if(g1 & g2) return false;
modify(st[idx[i]], col[idx[i]]);
}
}
return true;
}
int main(){
scanf("%d", &n);
for(int i = 1; i <= n; i++){
scanf("%d %d", &st[i], &en[i]);
lf[en[i]] = st[i];
lf[st[i]] = +oo;
rf[st[i]] = en[i];
rf[en[i]] = -oo;
idx[st[i]] = i;
idx[en[i]] = i;
}
tree.build(n);
nn = n + n;
int comp = 0;
for(int i = 1; i <= n; i++){
if(!vis[i]){
dfs(i);
++comp;
}
}
if(check() == false) printf("0\n");
else{
long long ret = 1LL;
long long mod = 1e9 + 7;
for(int i = 1; i <= comp; i++){
ret *= 2LL;
ret %= mod;
}
printf("%lld\n", ret);
}
return 0;
}
Compilation message
port_facility.cpp: In function 'int main()':
port_facility.cpp:120:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &n);
^
port_facility.cpp:122:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", &st[i], &en[i]);
^
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
134836 KB |
Output is correct |
2 |
Correct |
9 ms |
134836 KB |
Output is correct |
3 |
Correct |
6 ms |
134836 KB |
Output is correct |
4 |
Correct |
3 ms |
134836 KB |
Output is correct |
5 |
Correct |
3 ms |
134836 KB |
Output is correct |
6 |
Correct |
3 ms |
134836 KB |
Output is correct |
7 |
Correct |
3 ms |
134836 KB |
Output is correct |
8 |
Correct |
6 ms |
134836 KB |
Output is correct |
9 |
Correct |
3 ms |
134836 KB |
Output is correct |
10 |
Correct |
3 ms |
134836 KB |
Output is correct |
11 |
Correct |
3 ms |
134836 KB |
Output is correct |
12 |
Correct |
6 ms |
134836 KB |
Output is correct |
13 |
Correct |
3 ms |
134836 KB |
Output is correct |
14 |
Correct |
13 ms |
134836 KB |
Output is correct |
15 |
Correct |
3 ms |
134836 KB |
Output is correct |
16 |
Correct |
9 ms |
134836 KB |
Output is correct |
17 |
Correct |
3 ms |
134836 KB |
Output is correct |
18 |
Correct |
3 ms |
134836 KB |
Output is correct |
19 |
Correct |
3 ms |
134836 KB |
Output is correct |
20 |
Correct |
6 ms |
134836 KB |
Output is correct |
21 |
Correct |
6 ms |
134836 KB |
Output is correct |
22 |
Correct |
6 ms |
134836 KB |
Output is correct |
23 |
Correct |
9 ms |
134836 KB |
Output is correct |
24 |
Correct |
0 ms |
134836 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
134836 KB |
Output is correct |
2 |
Correct |
9 ms |
134836 KB |
Output is correct |
3 |
Correct |
6 ms |
134836 KB |
Output is correct |
4 |
Correct |
3 ms |
134836 KB |
Output is correct |
5 |
Correct |
3 ms |
134836 KB |
Output is correct |
6 |
Correct |
3 ms |
134836 KB |
Output is correct |
7 |
Correct |
3 ms |
134836 KB |
Output is correct |
8 |
Correct |
6 ms |
134836 KB |
Output is correct |
9 |
Correct |
3 ms |
134836 KB |
Output is correct |
10 |
Correct |
3 ms |
134836 KB |
Output is correct |
11 |
Correct |
3 ms |
134836 KB |
Output is correct |
12 |
Correct |
6 ms |
134836 KB |
Output is correct |
13 |
Correct |
3 ms |
134836 KB |
Output is correct |
14 |
Correct |
13 ms |
134836 KB |
Output is correct |
15 |
Correct |
3 ms |
134836 KB |
Output is correct |
16 |
Correct |
9 ms |
134836 KB |
Output is correct |
17 |
Correct |
3 ms |
134836 KB |
Output is correct |
18 |
Correct |
3 ms |
134836 KB |
Output is correct |
19 |
Correct |
3 ms |
134836 KB |
Output is correct |
20 |
Correct |
6 ms |
134836 KB |
Output is correct |
21 |
Correct |
6 ms |
134836 KB |
Output is correct |
22 |
Correct |
6 ms |
134836 KB |
Output is correct |
23 |
Correct |
9 ms |
134836 KB |
Output is correct |
24 |
Correct |
0 ms |
134836 KB |
Output is correct |
25 |
Correct |
9 ms |
134836 KB |
Output is correct |
26 |
Correct |
6 ms |
134836 KB |
Output is correct |
27 |
Correct |
9 ms |
134836 KB |
Output is correct |
28 |
Correct |
16 ms |
134836 KB |
Output is correct |
29 |
Correct |
6 ms |
134836 KB |
Output is correct |
30 |
Correct |
13 ms |
134836 KB |
Output is correct |
31 |
Correct |
6 ms |
134836 KB |
Output is correct |
32 |
Correct |
9 ms |
134836 KB |
Output is correct |
33 |
Correct |
6 ms |
134836 KB |
Output is correct |
34 |
Correct |
13 ms |
134836 KB |
Output is correct |
35 |
Correct |
9 ms |
134836 KB |
Output is correct |
36 |
Correct |
13 ms |
134836 KB |
Output is correct |
37 |
Correct |
6 ms |
134836 KB |
Output is correct |
38 |
Correct |
6 ms |
134836 KB |
Output is correct |
39 |
Correct |
6 ms |
134836 KB |
Output is correct |
40 |
Correct |
9 ms |
134836 KB |
Output is correct |
41 |
Correct |
9 ms |
134840 KB |
Output is correct |
42 |
Correct |
9 ms |
134836 KB |
Output is correct |
43 |
Correct |
3 ms |
134836 KB |
Output is correct |
44 |
Correct |
3 ms |
134836 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
134836 KB |
Output is correct |
2 |
Correct |
9 ms |
134836 KB |
Output is correct |
3 |
Correct |
6 ms |
134836 KB |
Output is correct |
4 |
Correct |
3 ms |
134836 KB |
Output is correct |
5 |
Correct |
3 ms |
134836 KB |
Output is correct |
6 |
Correct |
3 ms |
134836 KB |
Output is correct |
7 |
Correct |
3 ms |
134836 KB |
Output is correct |
8 |
Correct |
6 ms |
134836 KB |
Output is correct |
9 |
Correct |
3 ms |
134836 KB |
Output is correct |
10 |
Correct |
3 ms |
134836 KB |
Output is correct |
11 |
Correct |
3 ms |
134836 KB |
Output is correct |
12 |
Correct |
6 ms |
134836 KB |
Output is correct |
13 |
Correct |
3 ms |
134836 KB |
Output is correct |
14 |
Correct |
13 ms |
134836 KB |
Output is correct |
15 |
Correct |
3 ms |
134836 KB |
Output is correct |
16 |
Correct |
9 ms |
134836 KB |
Output is correct |
17 |
Correct |
3 ms |
134836 KB |
Output is correct |
18 |
Correct |
3 ms |
134836 KB |
Output is correct |
19 |
Correct |
3 ms |
134836 KB |
Output is correct |
20 |
Correct |
6 ms |
134836 KB |
Output is correct |
21 |
Correct |
6 ms |
134836 KB |
Output is correct |
22 |
Correct |
6 ms |
134836 KB |
Output is correct |
23 |
Correct |
9 ms |
134836 KB |
Output is correct |
24 |
Correct |
0 ms |
134836 KB |
Output is correct |
25 |
Correct |
9 ms |
134836 KB |
Output is correct |
26 |
Correct |
6 ms |
134836 KB |
Output is correct |
27 |
Correct |
9 ms |
134836 KB |
Output is correct |
28 |
Correct |
16 ms |
134836 KB |
Output is correct |
29 |
Correct |
6 ms |
134836 KB |
Output is correct |
30 |
Correct |
13 ms |
134836 KB |
Output is correct |
31 |
Correct |
6 ms |
134836 KB |
Output is correct |
32 |
Correct |
9 ms |
134836 KB |
Output is correct |
33 |
Correct |
6 ms |
134836 KB |
Output is correct |
34 |
Correct |
13 ms |
134836 KB |
Output is correct |
35 |
Correct |
9 ms |
134836 KB |
Output is correct |
36 |
Correct |
13 ms |
134836 KB |
Output is correct |
37 |
Correct |
6 ms |
134836 KB |
Output is correct |
38 |
Correct |
6 ms |
134836 KB |
Output is correct |
39 |
Correct |
6 ms |
134836 KB |
Output is correct |
40 |
Correct |
9 ms |
134836 KB |
Output is correct |
41 |
Correct |
9 ms |
134840 KB |
Output is correct |
42 |
Correct |
9 ms |
134836 KB |
Output is correct |
43 |
Correct |
3 ms |
134836 KB |
Output is correct |
44 |
Correct |
3 ms |
134836 KB |
Output is correct |
45 |
Correct |
176 ms |
135604 KB |
Output is correct |
46 |
Correct |
176 ms |
136428 KB |
Output is correct |
47 |
Correct |
173 ms |
135028 KB |
Output is correct |
48 |
Correct |
179 ms |
136396 KB |
Output is correct |
49 |
Correct |
179 ms |
135144 KB |
Output is correct |
50 |
Correct |
166 ms |
136192 KB |
Output is correct |
51 |
Correct |
146 ms |
136148 KB |
Output is correct |
52 |
Correct |
103 ms |
134836 KB |
Output is correct |
53 |
Correct |
159 ms |
134836 KB |
Output is correct |
54 |
Correct |
139 ms |
140956 KB |
Output is correct |
55 |
Correct |
123 ms |
137840 KB |
Output is correct |
56 |
Correct |
139 ms |
137840 KB |
Output is correct |
57 |
Correct |
116 ms |
134836 KB |
Output is correct |
58 |
Correct |
126 ms |
134836 KB |
Output is correct |
59 |
Correct |
163 ms |
134836 KB |
Output is correct |
60 |
Correct |
149 ms |
134836 KB |
Output is correct |
61 |
Correct |
163 ms |
134836 KB |
Output is correct |
62 |
Correct |
159 ms |
134836 KB |
Output is correct |
63 |
Correct |
123 ms |
134836 KB |
Output is correct |
64 |
Correct |
153 ms |
134836 KB |
Output is correct |
65 |
Correct |
206 ms |
140960 KB |
Output is correct |
66 |
Correct |
229 ms |
140960 KB |
Output is correct |
67 |
Correct |
166 ms |
137832 KB |
Output is correct |
68 |
Correct |
173 ms |
137832 KB |
Output is correct |
69 |
Correct |
176 ms |
137492 KB |
Output is correct |
70 |
Correct |
179 ms |
137484 KB |
Output is correct |
71 |
Correct |
163 ms |
140964 KB |
Output is correct |
72 |
Correct |
156 ms |
140956 KB |
Output is correct |
73 |
Correct |
163 ms |
138876 KB |
Output is correct |
74 |
Correct |
153 ms |
138876 KB |
Output is correct |
75 |
Correct |
129 ms |
138432 KB |
Output is correct |
76 |
Correct |
119 ms |
140964 KB |
Output is correct |
77 |
Correct |
109 ms |
140964 KB |
Output is correct |
78 |
Correct |
149 ms |
136236 KB |
Output is correct |
79 |
Correct |
163 ms |
135664 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
134836 KB |
Output is correct |
2 |
Correct |
9 ms |
134836 KB |
Output is correct |
3 |
Correct |
6 ms |
134836 KB |
Output is correct |
4 |
Correct |
3 ms |
134836 KB |
Output is correct |
5 |
Correct |
3 ms |
134836 KB |
Output is correct |
6 |
Correct |
3 ms |
134836 KB |
Output is correct |
7 |
Correct |
3 ms |
134836 KB |
Output is correct |
8 |
Correct |
6 ms |
134836 KB |
Output is correct |
9 |
Correct |
3 ms |
134836 KB |
Output is correct |
10 |
Correct |
3 ms |
134836 KB |
Output is correct |
11 |
Correct |
3 ms |
134836 KB |
Output is correct |
12 |
Correct |
6 ms |
134836 KB |
Output is correct |
13 |
Correct |
3 ms |
134836 KB |
Output is correct |
14 |
Correct |
13 ms |
134836 KB |
Output is correct |
15 |
Correct |
3 ms |
134836 KB |
Output is correct |
16 |
Correct |
9 ms |
134836 KB |
Output is correct |
17 |
Correct |
3 ms |
134836 KB |
Output is correct |
18 |
Correct |
3 ms |
134836 KB |
Output is correct |
19 |
Correct |
3 ms |
134836 KB |
Output is correct |
20 |
Correct |
6 ms |
134836 KB |
Output is correct |
21 |
Correct |
6 ms |
134836 KB |
Output is correct |
22 |
Correct |
6 ms |
134836 KB |
Output is correct |
23 |
Correct |
9 ms |
134836 KB |
Output is correct |
24 |
Correct |
0 ms |
134836 KB |
Output is correct |
25 |
Correct |
9 ms |
134836 KB |
Output is correct |
26 |
Correct |
6 ms |
134836 KB |
Output is correct |
27 |
Correct |
9 ms |
134836 KB |
Output is correct |
28 |
Correct |
16 ms |
134836 KB |
Output is correct |
29 |
Correct |
6 ms |
134836 KB |
Output is correct |
30 |
Correct |
13 ms |
134836 KB |
Output is correct |
31 |
Correct |
6 ms |
134836 KB |
Output is correct |
32 |
Correct |
9 ms |
134836 KB |
Output is correct |
33 |
Correct |
6 ms |
134836 KB |
Output is correct |
34 |
Correct |
13 ms |
134836 KB |
Output is correct |
35 |
Correct |
9 ms |
134836 KB |
Output is correct |
36 |
Correct |
13 ms |
134836 KB |
Output is correct |
37 |
Correct |
6 ms |
134836 KB |
Output is correct |
38 |
Correct |
6 ms |
134836 KB |
Output is correct |
39 |
Correct |
6 ms |
134836 KB |
Output is correct |
40 |
Correct |
9 ms |
134836 KB |
Output is correct |
41 |
Correct |
9 ms |
134840 KB |
Output is correct |
42 |
Correct |
9 ms |
134836 KB |
Output is correct |
43 |
Correct |
3 ms |
134836 KB |
Output is correct |
44 |
Correct |
3 ms |
134836 KB |
Output is correct |
45 |
Correct |
176 ms |
135604 KB |
Output is correct |
46 |
Correct |
176 ms |
136428 KB |
Output is correct |
47 |
Correct |
173 ms |
135028 KB |
Output is correct |
48 |
Correct |
179 ms |
136396 KB |
Output is correct |
49 |
Correct |
179 ms |
135144 KB |
Output is correct |
50 |
Correct |
166 ms |
136192 KB |
Output is correct |
51 |
Correct |
146 ms |
136148 KB |
Output is correct |
52 |
Correct |
103 ms |
134836 KB |
Output is correct |
53 |
Correct |
159 ms |
134836 KB |
Output is correct |
54 |
Correct |
139 ms |
140956 KB |
Output is correct |
55 |
Correct |
123 ms |
137840 KB |
Output is correct |
56 |
Correct |
139 ms |
137840 KB |
Output is correct |
57 |
Correct |
116 ms |
134836 KB |
Output is correct |
58 |
Correct |
126 ms |
134836 KB |
Output is correct |
59 |
Correct |
163 ms |
134836 KB |
Output is correct |
60 |
Correct |
149 ms |
134836 KB |
Output is correct |
61 |
Correct |
163 ms |
134836 KB |
Output is correct |
62 |
Correct |
159 ms |
134836 KB |
Output is correct |
63 |
Correct |
123 ms |
134836 KB |
Output is correct |
64 |
Correct |
153 ms |
134836 KB |
Output is correct |
65 |
Correct |
206 ms |
140960 KB |
Output is correct |
66 |
Correct |
229 ms |
140960 KB |
Output is correct |
67 |
Correct |
166 ms |
137832 KB |
Output is correct |
68 |
Correct |
173 ms |
137832 KB |
Output is correct |
69 |
Correct |
176 ms |
137492 KB |
Output is correct |
70 |
Correct |
179 ms |
137484 KB |
Output is correct |
71 |
Correct |
163 ms |
140964 KB |
Output is correct |
72 |
Correct |
156 ms |
140956 KB |
Output is correct |
73 |
Correct |
163 ms |
138876 KB |
Output is correct |
74 |
Correct |
153 ms |
138876 KB |
Output is correct |
75 |
Correct |
129 ms |
138432 KB |
Output is correct |
76 |
Correct |
119 ms |
140964 KB |
Output is correct |
77 |
Correct |
109 ms |
140964 KB |
Output is correct |
78 |
Correct |
149 ms |
136236 KB |
Output is correct |
79 |
Correct |
163 ms |
135664 KB |
Output is correct |
80 |
Correct |
2323 ms |
138580 KB |
Output is correct |
81 |
Correct |
2239 ms |
137804 KB |
Output is correct |
82 |
Correct |
2276 ms |
135268 KB |
Output is correct |
83 |
Correct |
2246 ms |
137920 KB |
Output is correct |
84 |
Correct |
2016 ms |
138580 KB |
Output is correct |
85 |
Correct |
2066 ms |
135712 KB |
Output is correct |
86 |
Correct |
1953 ms |
137948 KB |
Output is correct |
87 |
Correct |
1639 ms |
134836 KB |
Output is correct |
88 |
Correct |
2356 ms |
134836 KB |
Output is correct |
89 |
Correct |
1966 ms |
197212 KB |
Output is correct |
90 |
Correct |
1983 ms |
165960 KB |
Output is correct |
91 |
Correct |
1869 ms |
165956 KB |
Output is correct |
92 |
Correct |
1923 ms |
134836 KB |
Output is correct |
93 |
Correct |
1643 ms |
134836 KB |
Output is correct |
94 |
Correct |
2069 ms |
134836 KB |
Output is correct |
95 |
Correct |
1906 ms |
134836 KB |
Output is correct |
96 |
Correct |
2043 ms |
134836 KB |
Output is correct |
97 |
Correct |
1793 ms |
134836 KB |
Output is correct |
98 |
Correct |
1783 ms |
134836 KB |
Output is correct |
99 |
Correct |
1843 ms |
134836 KB |
Output is correct |
100 |
Correct |
3003 ms |
197212 KB |
Output is correct |
101 |
Correct |
2989 ms |
197208 KB |
Output is correct |
102 |
Correct |
2459 ms |
165984 KB |
Output is correct |
103 |
Correct |
2389 ms |
165936 KB |
Output is correct |
104 |
Correct |
2333 ms |
162488 KB |
Output is correct |
105 |
Correct |
2453 ms |
162488 KB |
Output is correct |
106 |
Correct |
2263 ms |
197216 KB |
Output is correct |
107 |
Correct |
2196 ms |
197212 KB |
Output is correct |
108 |
Correct |
2193 ms |
176376 KB |
Output is correct |
109 |
Correct |
2013 ms |
176376 KB |
Output is correct |
110 |
Correct |
1513 ms |
195944 KB |
Output is correct |
111 |
Correct |
1506 ms |
197212 KB |
Output is correct |
112 |
Correct |
1293 ms |
197212 KB |
Output is correct |
113 |
Correct |
2163 ms |
135276 KB |
Output is correct |
114 |
Correct |
2189 ms |
137736 KB |
Output is correct |