#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:77:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&n);
~~~~~^~~~~~~~~
port_facility.cpp:81:8: 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 |
3 ms |
380 KB |
Output is correct |
| 2 |
Correct |
4 ms |
484 KB |
Output is correct |
| 3 |
Correct |
2 ms |
484 KB |
Output is correct |
| 4 |
Correct |
2 ms |
484 KB |
Output is correct |
| 5 |
Correct |
4 ms |
512 KB |
Output is correct |
| 6 |
Correct |
3 ms |
560 KB |
Output is correct |
| 7 |
Correct |
3 ms |
592 KB |
Output is correct |
| 8 |
Correct |
3 ms |
592 KB |
Output is correct |
| 9 |
Correct |
3 ms |
592 KB |
Output is correct |
| 10 |
Correct |
3 ms |
592 KB |
Output is correct |
| 11 |
Correct |
3 ms |
592 KB |
Output is correct |
| 12 |
Correct |
3 ms |
592 KB |
Output is correct |
| 13 |
Correct |
2 ms |
592 KB |
Output is correct |
| 14 |
Correct |
3 ms |
720 KB |
Output is correct |
| 15 |
Correct |
3 ms |
720 KB |
Output is correct |
| 16 |
Correct |
3 ms |
720 KB |
Output is correct |
| 17 |
Correct |
2 ms |
720 KB |
Output is correct |
| 18 |
Correct |
2 ms |
720 KB |
Output is correct |
| 19 |
Correct |
2 ms |
720 KB |
Output is correct |
| 20 |
Correct |
3 ms |
720 KB |
Output is correct |
| 21 |
Correct |
3 ms |
720 KB |
Output is correct |
| 22 |
Correct |
3 ms |
720 KB |
Output is correct |
| 23 |
Correct |
3 ms |
720 KB |
Output is correct |
| 24 |
Correct |
3 ms |
720 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
380 KB |
Output is correct |
| 2 |
Correct |
4 ms |
484 KB |
Output is correct |
| 3 |
Correct |
2 ms |
484 KB |
Output is correct |
| 4 |
Correct |
2 ms |
484 KB |
Output is correct |
| 5 |
Correct |
4 ms |
512 KB |
Output is correct |
| 6 |
Correct |
3 ms |
560 KB |
Output is correct |
| 7 |
Correct |
3 ms |
592 KB |
Output is correct |
| 8 |
Correct |
3 ms |
592 KB |
Output is correct |
| 9 |
Correct |
3 ms |
592 KB |
Output is correct |
| 10 |
Correct |
3 ms |
592 KB |
Output is correct |
| 11 |
Correct |
3 ms |
592 KB |
Output is correct |
| 12 |
Correct |
3 ms |
592 KB |
Output is correct |
| 13 |
Correct |
2 ms |
592 KB |
Output is correct |
| 14 |
Correct |
3 ms |
720 KB |
Output is correct |
| 15 |
Correct |
3 ms |
720 KB |
Output is correct |
| 16 |
Correct |
3 ms |
720 KB |
Output is correct |
| 17 |
Correct |
2 ms |
720 KB |
Output is correct |
| 18 |
Correct |
2 ms |
720 KB |
Output is correct |
| 19 |
Correct |
2 ms |
720 KB |
Output is correct |
| 20 |
Correct |
3 ms |
720 KB |
Output is correct |
| 21 |
Correct |
3 ms |
720 KB |
Output is correct |
| 22 |
Correct |
3 ms |
720 KB |
Output is correct |
| 23 |
Correct |
3 ms |
720 KB |
Output is correct |
| 24 |
Correct |
3 ms |
720 KB |
Output is correct |
| 25 |
Correct |
4 ms |
868 KB |
Output is correct |
| 26 |
Correct |
5 ms |
876 KB |
Output is correct |
| 27 |
Correct |
4 ms |
876 KB |
Output is correct |
| 28 |
Correct |
4 ms |
876 KB |
Output is correct |
| 29 |
Correct |
5 ms |
876 KB |
Output is correct |
| 30 |
Correct |
4 ms |
876 KB |
Output is correct |
| 31 |
Correct |
5 ms |
876 KB |
Output is correct |
| 32 |
Correct |
4 ms |
876 KB |
Output is correct |
| 33 |
Correct |
5 ms |
876 KB |
Output is correct |
| 34 |
Correct |
5 ms |
876 KB |
Output is correct |
| 35 |
Correct |
5 ms |
876 KB |
Output is correct |
| 36 |
Correct |
4 ms |
876 KB |
Output is correct |
| 37 |
Correct |
4 ms |
876 KB |
Output is correct |
| 38 |
Correct |
6 ms |
876 KB |
Output is correct |
| 39 |
Correct |
5 ms |
876 KB |
Output is correct |
| 40 |
Correct |
6 ms |
876 KB |
Output is correct |
| 41 |
Correct |
5 ms |
876 KB |
Output is correct |
| 42 |
Correct |
5 ms |
876 KB |
Output is correct |
| 43 |
Correct |
4 ms |
876 KB |
Output is correct |
| 44 |
Correct |
3 ms |
876 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
380 KB |
Output is correct |
| 2 |
Correct |
4 ms |
484 KB |
Output is correct |
| 3 |
Correct |
2 ms |
484 KB |
Output is correct |
| 4 |
Correct |
2 ms |
484 KB |
Output is correct |
| 5 |
Correct |
4 ms |
512 KB |
Output is correct |
| 6 |
Correct |
3 ms |
560 KB |
Output is correct |
| 7 |
Correct |
3 ms |
592 KB |
Output is correct |
| 8 |
Correct |
3 ms |
592 KB |
Output is correct |
| 9 |
Correct |
3 ms |
592 KB |
Output is correct |
| 10 |
Correct |
3 ms |
592 KB |
Output is correct |
| 11 |
Correct |
3 ms |
592 KB |
Output is correct |
| 12 |
Correct |
3 ms |
592 KB |
Output is correct |
| 13 |
Correct |
2 ms |
592 KB |
Output is correct |
| 14 |
Correct |
3 ms |
720 KB |
Output is correct |
| 15 |
Correct |
3 ms |
720 KB |
Output is correct |
| 16 |
Correct |
3 ms |
720 KB |
Output is correct |
| 17 |
Correct |
2 ms |
720 KB |
Output is correct |
| 18 |
Correct |
2 ms |
720 KB |
Output is correct |
| 19 |
Correct |
2 ms |
720 KB |
Output is correct |
| 20 |
Correct |
3 ms |
720 KB |
Output is correct |
| 21 |
Correct |
3 ms |
720 KB |
Output is correct |
| 22 |
Correct |
3 ms |
720 KB |
Output is correct |
| 23 |
Correct |
3 ms |
720 KB |
Output is correct |
| 24 |
Correct |
3 ms |
720 KB |
Output is correct |
| 25 |
Correct |
4 ms |
868 KB |
Output is correct |
| 26 |
Correct |
5 ms |
876 KB |
Output is correct |
| 27 |
Correct |
4 ms |
876 KB |
Output is correct |
| 28 |
Correct |
4 ms |
876 KB |
Output is correct |
| 29 |
Correct |
5 ms |
876 KB |
Output is correct |
| 30 |
Correct |
4 ms |
876 KB |
Output is correct |
| 31 |
Correct |
5 ms |
876 KB |
Output is correct |
| 32 |
Correct |
4 ms |
876 KB |
Output is correct |
| 33 |
Correct |
5 ms |
876 KB |
Output is correct |
| 34 |
Correct |
5 ms |
876 KB |
Output is correct |
| 35 |
Correct |
5 ms |
876 KB |
Output is correct |
| 36 |
Correct |
4 ms |
876 KB |
Output is correct |
| 37 |
Correct |
4 ms |
876 KB |
Output is correct |
| 38 |
Correct |
6 ms |
876 KB |
Output is correct |
| 39 |
Correct |
5 ms |
876 KB |
Output is correct |
| 40 |
Correct |
6 ms |
876 KB |
Output is correct |
| 41 |
Correct |
5 ms |
876 KB |
Output is correct |
| 42 |
Correct |
5 ms |
876 KB |
Output is correct |
| 43 |
Correct |
4 ms |
876 KB |
Output is correct |
| 44 |
Correct |
3 ms |
876 KB |
Output is correct |
| 45 |
Correct |
161 ms |
9268 KB |
Output is correct |
| 46 |
Correct |
162 ms |
9916 KB |
Output is correct |
| 47 |
Correct |
153 ms |
9916 KB |
Output is correct |
| 48 |
Correct |
159 ms |
9964 KB |
Output is correct |
| 49 |
Correct |
177 ms |
9964 KB |
Output is correct |
| 50 |
Correct |
136 ms |
9964 KB |
Output is correct |
| 51 |
Correct |
169 ms |
9964 KB |
Output is correct |
| 52 |
Correct |
121 ms |
9964 KB |
Output is correct |
| 53 |
Correct |
139 ms |
9964 KB |
Output is correct |
| 54 |
Correct |
157 ms |
13204 KB |
Output is correct |
| 55 |
Correct |
158 ms |
13204 KB |
Output is correct |
| 56 |
Correct |
146 ms |
13204 KB |
Output is correct |
| 57 |
Correct |
122 ms |
13204 KB |
Output is correct |
| 58 |
Correct |
126 ms |
13204 KB |
Output is correct |
| 59 |
Correct |
146 ms |
13204 KB |
Output is correct |
| 60 |
Correct |
188 ms |
13204 KB |
Output is correct |
| 61 |
Correct |
159 ms |
13204 KB |
Output is correct |
| 62 |
Correct |
161 ms |
13204 KB |
Output is correct |
| 63 |
Correct |
143 ms |
13204 KB |
Output is correct |
| 64 |
Correct |
133 ms |
13204 KB |
Output is correct |
| 65 |
Correct |
236 ms |
13204 KB |
Output is correct |
| 66 |
Correct |
217 ms |
13268 KB |
Output is correct |
| 67 |
Correct |
204 ms |
13268 KB |
Output is correct |
| 68 |
Correct |
153 ms |
13268 KB |
Output is correct |
| 69 |
Correct |
151 ms |
13268 KB |
Output is correct |
| 70 |
Correct |
165 ms |
13268 KB |
Output is correct |
| 71 |
Correct |
182 ms |
13800 KB |
Output is correct |
| 72 |
Correct |
167 ms |
13860 KB |
Output is correct |
| 73 |
Correct |
158 ms |
13860 KB |
Output is correct |
| 74 |
Correct |
154 ms |
13860 KB |
Output is correct |
| 75 |
Correct |
142 ms |
13860 KB |
Output is correct |
| 76 |
Correct |
141 ms |
13860 KB |
Output is correct |
| 77 |
Correct |
150 ms |
13860 KB |
Output is correct |
| 78 |
Correct |
187 ms |
13860 KB |
Output is correct |
| 79 |
Correct |
152 ms |
13860 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
380 KB |
Output is correct |
| 2 |
Correct |
4 ms |
484 KB |
Output is correct |
| 3 |
Correct |
2 ms |
484 KB |
Output is correct |
| 4 |
Correct |
2 ms |
484 KB |
Output is correct |
| 5 |
Correct |
4 ms |
512 KB |
Output is correct |
| 6 |
Correct |
3 ms |
560 KB |
Output is correct |
| 7 |
Correct |
3 ms |
592 KB |
Output is correct |
| 8 |
Correct |
3 ms |
592 KB |
Output is correct |
| 9 |
Correct |
3 ms |
592 KB |
Output is correct |
| 10 |
Correct |
3 ms |
592 KB |
Output is correct |
| 11 |
Correct |
3 ms |
592 KB |
Output is correct |
| 12 |
Correct |
3 ms |
592 KB |
Output is correct |
| 13 |
Correct |
2 ms |
592 KB |
Output is correct |
| 14 |
Correct |
3 ms |
720 KB |
Output is correct |
| 15 |
Correct |
3 ms |
720 KB |
Output is correct |
| 16 |
Correct |
3 ms |
720 KB |
Output is correct |
| 17 |
Correct |
2 ms |
720 KB |
Output is correct |
| 18 |
Correct |
2 ms |
720 KB |
Output is correct |
| 19 |
Correct |
2 ms |
720 KB |
Output is correct |
| 20 |
Correct |
3 ms |
720 KB |
Output is correct |
| 21 |
Correct |
3 ms |
720 KB |
Output is correct |
| 22 |
Correct |
3 ms |
720 KB |
Output is correct |
| 23 |
Correct |
3 ms |
720 KB |
Output is correct |
| 24 |
Correct |
3 ms |
720 KB |
Output is correct |
| 25 |
Correct |
4 ms |
868 KB |
Output is correct |
| 26 |
Correct |
5 ms |
876 KB |
Output is correct |
| 27 |
Correct |
4 ms |
876 KB |
Output is correct |
| 28 |
Correct |
4 ms |
876 KB |
Output is correct |
| 29 |
Correct |
5 ms |
876 KB |
Output is correct |
| 30 |
Correct |
4 ms |
876 KB |
Output is correct |
| 31 |
Correct |
5 ms |
876 KB |
Output is correct |
| 32 |
Correct |
4 ms |
876 KB |
Output is correct |
| 33 |
Correct |
5 ms |
876 KB |
Output is correct |
| 34 |
Correct |
5 ms |
876 KB |
Output is correct |
| 35 |
Correct |
5 ms |
876 KB |
Output is correct |
| 36 |
Correct |
4 ms |
876 KB |
Output is correct |
| 37 |
Correct |
4 ms |
876 KB |
Output is correct |
| 38 |
Correct |
6 ms |
876 KB |
Output is correct |
| 39 |
Correct |
5 ms |
876 KB |
Output is correct |
| 40 |
Correct |
6 ms |
876 KB |
Output is correct |
| 41 |
Correct |
5 ms |
876 KB |
Output is correct |
| 42 |
Correct |
5 ms |
876 KB |
Output is correct |
| 43 |
Correct |
4 ms |
876 KB |
Output is correct |
| 44 |
Correct |
3 ms |
876 KB |
Output is correct |
| 45 |
Correct |
161 ms |
9268 KB |
Output is correct |
| 46 |
Correct |
162 ms |
9916 KB |
Output is correct |
| 47 |
Correct |
153 ms |
9916 KB |
Output is correct |
| 48 |
Correct |
159 ms |
9964 KB |
Output is correct |
| 49 |
Correct |
177 ms |
9964 KB |
Output is correct |
| 50 |
Correct |
136 ms |
9964 KB |
Output is correct |
| 51 |
Correct |
169 ms |
9964 KB |
Output is correct |
| 52 |
Correct |
121 ms |
9964 KB |
Output is correct |
| 53 |
Correct |
139 ms |
9964 KB |
Output is correct |
| 54 |
Correct |
157 ms |
13204 KB |
Output is correct |
| 55 |
Correct |
158 ms |
13204 KB |
Output is correct |
| 56 |
Correct |
146 ms |
13204 KB |
Output is correct |
| 57 |
Correct |
122 ms |
13204 KB |
Output is correct |
| 58 |
Correct |
126 ms |
13204 KB |
Output is correct |
| 59 |
Correct |
146 ms |
13204 KB |
Output is correct |
| 60 |
Correct |
188 ms |
13204 KB |
Output is correct |
| 61 |
Correct |
159 ms |
13204 KB |
Output is correct |
| 62 |
Correct |
161 ms |
13204 KB |
Output is correct |
| 63 |
Correct |
143 ms |
13204 KB |
Output is correct |
| 64 |
Correct |
133 ms |
13204 KB |
Output is correct |
| 65 |
Correct |
236 ms |
13204 KB |
Output is correct |
| 66 |
Correct |
217 ms |
13268 KB |
Output is correct |
| 67 |
Correct |
204 ms |
13268 KB |
Output is correct |
| 68 |
Correct |
153 ms |
13268 KB |
Output is correct |
| 69 |
Correct |
151 ms |
13268 KB |
Output is correct |
| 70 |
Correct |
165 ms |
13268 KB |
Output is correct |
| 71 |
Correct |
182 ms |
13800 KB |
Output is correct |
| 72 |
Correct |
167 ms |
13860 KB |
Output is correct |
| 73 |
Correct |
158 ms |
13860 KB |
Output is correct |
| 74 |
Correct |
154 ms |
13860 KB |
Output is correct |
| 75 |
Correct |
142 ms |
13860 KB |
Output is correct |
| 76 |
Correct |
141 ms |
13860 KB |
Output is correct |
| 77 |
Correct |
150 ms |
13860 KB |
Output is correct |
| 78 |
Correct |
187 ms |
13860 KB |
Output is correct |
| 79 |
Correct |
152 ms |
13860 KB |
Output is correct |
| 80 |
Correct |
2415 ms |
92912 KB |
Output is correct |
| 81 |
Correct |
2268 ms |
106756 KB |
Output is correct |
| 82 |
Correct |
2103 ms |
119928 KB |
Output is correct |
| 83 |
Correct |
2189 ms |
135980 KB |
Output is correct |
| 84 |
Correct |
2114 ms |
151108 KB |
Output is correct |
| 85 |
Correct |
1960 ms |
163892 KB |
Output is correct |
| 86 |
Correct |
2121 ms |
179764 KB |
Output is correct |
| 87 |
Correct |
1858 ms |
186444 KB |
Output is correct |
| 88 |
Correct |
1926 ms |
214256 KB |
Output is correct |
| 89 |
Correct |
2337 ms |
253568 KB |
Output is correct |
| 90 |
Correct |
2244 ms |
253568 KB |
Output is correct |
| 91 |
Correct |
2297 ms |
258136 KB |
Output is correct |
| 92 |
Correct |
1837 ms |
258136 KB |
Output is correct |
| 93 |
Correct |
1842 ms |
263332 KB |
Output is correct |
| 94 |
Correct |
2108 ms |
278200 KB |
Output is correct |
| 95 |
Correct |
2084 ms |
291088 KB |
Output is correct |
| 96 |
Correct |
2294 ms |
302572 KB |
Output is correct |
| 97 |
Correct |
1894 ms |
314888 KB |
Output is correct |
| 98 |
Correct |
2161 ms |
324116 KB |
Output is correct |
| 99 |
Correct |
2009 ms |
335180 KB |
Output is correct |
| 100 |
Correct |
3618 ms |
375240 KB |
Output is correct |
| 101 |
Correct |
3210 ms |
386040 KB |
Output is correct |
| 102 |
Correct |
2259 ms |
386040 KB |
Output is correct |
| 103 |
Correct |
2165 ms |
395584 KB |
Output is correct |
| 104 |
Correct |
2311 ms |
406092 KB |
Output is correct |
| 105 |
Correct |
2375 ms |
416236 KB |
Output is correct |
| 106 |
Correct |
2397 ms |
442264 KB |
Output is correct |
| 107 |
Correct |
2302 ms |
452324 KB |
Output is correct |
| 108 |
Correct |
2422 ms |
453432 KB |
Output is correct |
| 109 |
Correct |
2141 ms |
463124 KB |
Output is correct |
| 110 |
Correct |
2085 ms |
475920 KB |
Output is correct |
| 111 |
Correct |
1880 ms |
485300 KB |
Output is correct |
| 112 |
Correct |
1867 ms |
494832 KB |
Output is correct |
| 113 |
Correct |
2070 ms |
494832 KB |
Output is correct |
| 114 |
Correct |
2373 ms |
494832 KB |
Output is correct |
