#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long
// 217
// 44
using namespace std;
const int MOD = (int) 1e9 + 7;
const int INF = (int) 1e9;
const int MAXN = (int) 1e6;
inline void mod(int &x) {
if(x >= MOD)
x -= MOD;
}
struct SegTree {
int aint[8 * MAXN + 1];
int n;
inline void init(int _n) {
n = _n;
for(int i = 1; i <= 4 * n; i++) {
aint[i] = -INF;
}
}
void update(int nod, int left, int right, int pos, int cur) {
if(left == right) {
aint[nod] = cur;
}
else {
int mid = (left + right) / 2;
if(pos <= mid) update(2 * nod, left, mid, pos, cur);
else update(2 * nod + 1, mid + 1, right, pos, cur);
aint[nod] = max(aint[2 * nod], aint[2 * nod + 1]);
}
}
int query(int nod, int left, int right, int l, int r) {
if(l <= left && right <= r) {
return aint[nod];
}
else {
int mid = (left + right) / 2;
int ans = -INF;
if(l <= mid) ans = max(ans, query(2 * nod, left, mid, l, r));
if(mid < r) ans = max(ans, query(2 * nod + 1, mid + 1, right, l, r));
return ans;
}
}
void update(int pos, int cur) {
update(1, 1, n, pos, cur);
}
int query(int l, int r) {
return query(1, 1, n, l, r);
}
};
SegTree stl, str;
pair <int, int> arr[MAXN + 1];
int who[2 * MAXN + 1];
bool vis[MAXN + 1], col[MAXN + 1];
int n;
void dfs(int nod, int c) {
col[nod] = c;
vis[nod] = 1;
while(1) {
int cur = str.query(arr[nod].first, arr[nod].second);
if(cur <= arr[nod].second) {
break;
}
int id = who[cur];
str.update(arr[id].first, -INF);
if(vis[id] == 0) {
dfs(id, c ^ 1);
}
}
while(1) {
int cur = -stl.query(arr[nod].first, arr[nod].second);
if(cur >= arr[nod].first) {
break;
}
int id = who[cur];
stl.update(arr[id].second, -INF);
if(vis[id] == 0) {
dfs(id, c ^ 1);
}
}
}
struct Fenwick {
int aib[2 * MAXN + 1];
int n;
inline void init(int _n) {
n = _n;
for(int i = 1; i <= n; i++) {
aib[i] = 0;
}
}
inline void update(int pos) {
for(int i = pos; i <= n; i += lsb(i)) {
aib[i]++;
}
}
inline int query(int pos) {
int ans = 0;
for(int i = pos; i > 0; i -= lsb(i)) {
ans += aib[i];
}
return ans;
}
inline int sum(int l, int r) {
return query(r) - query(l - 1);
}
};
const int MAXBUF = (1 << 17);
char buf[MAXBUF];
int pbuf = MAXBUF;
inline char nextch() {
if(pbuf == MAXBUF) {
fread(buf, 1, MAXBUF, stdin);
pbuf = 0;
}
return buf[pbuf++];
}
inline int getnr() {
char ch = nextch();
while(!isdigit(ch)) {
ch = nextch();
}
int nr = 0;
while(isdigit(ch)) {
nr = nr * 10 + ch - '0';
ch = nextch();
}
return nr;
}
int main() {
//ifstream cin("A.in");
//ofstream cout("A.out");
int i;
//ios::sync_with_stdio(false);
//cin.tie(0), cout.tie(0);
n = getnr();
stl.init(2 * n), str.init(2 * n);
for(i = 1; i <= n; i++) {
arr[i].first = getnr();
arr[i].second = getnr();
str.update(arr[i].first, arr[i].second);
stl.update(arr[i].second, -arr[i].first);
who[arr[i].first] = who[arr[i].second] = i;
}
int ans = 1;
for(i = 1; i <= n; i++) {
if(vis[i] == 0) {
dfs(i, 0);
ans *= 2;
mod(ans);
}
}
Fenwick fen[2];
for(i = 0; i < 2; i++) {
fen[i].init(2 * n);
}
vector <int> ord(n + 1);
iota(ord.begin(), ord.end(), 0);
sort(ord.begin(), ord.end(), [&](const int &a, const int &b) {
return arr[a].first < arr[b].first;
});
for(i = 1; i <= n; i++) {
int id = ord[i];
if(fen[col[id]].sum(arr[id].first, arr[id].second) > 0) {
ans = 0;
break;
}
fen[col[id]].update(arr[id].second);
}
cout << ans;
//cin.close();
//cout.close();
return 0;
}
Compilation message
port_facility.cpp: In function 'char nextch()':
port_facility.cpp:162:14: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
fread(buf, 1, MAXBUF, stdin);
~~~~~^~~~~~~~~~~~~~~~~~~~~~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
384 KB |
Output is correct |
2 |
Correct |
2 ms |
384 KB |
Output is correct |
3 |
Correct |
2 ms |
384 KB |
Output is correct |
4 |
Correct |
2 ms |
384 KB |
Output is correct |
5 |
Correct |
2 ms |
384 KB |
Output is correct |
6 |
Correct |
2 ms |
384 KB |
Output is correct |
7 |
Correct |
3 ms |
384 KB |
Output is correct |
8 |
Correct |
2 ms |
384 KB |
Output is correct |
9 |
Correct |
2 ms |
384 KB |
Output is correct |
10 |
Correct |
2 ms |
384 KB |
Output is correct |
11 |
Correct |
3 ms |
384 KB |
Output is correct |
12 |
Correct |
2 ms |
384 KB |
Output is correct |
13 |
Correct |
3 ms |
412 KB |
Output is correct |
14 |
Correct |
2 ms |
384 KB |
Output is correct |
15 |
Correct |
2 ms |
384 KB |
Output is correct |
16 |
Correct |
2 ms |
384 KB |
Output is correct |
17 |
Correct |
3 ms |
384 KB |
Output is correct |
18 |
Correct |
2 ms |
384 KB |
Output is correct |
19 |
Correct |
2 ms |
384 KB |
Output is correct |
20 |
Correct |
2 ms |
384 KB |
Output is correct |
21 |
Correct |
2 ms |
384 KB |
Output is correct |
22 |
Correct |
2 ms |
384 KB |
Output is correct |
23 |
Correct |
2 ms |
384 KB |
Output is correct |
24 |
Correct |
2 ms |
384 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
384 KB |
Output is correct |
2 |
Correct |
2 ms |
384 KB |
Output is correct |
3 |
Correct |
2 ms |
384 KB |
Output is correct |
4 |
Correct |
2 ms |
384 KB |
Output is correct |
5 |
Correct |
2 ms |
384 KB |
Output is correct |
6 |
Correct |
2 ms |
384 KB |
Output is correct |
7 |
Correct |
3 ms |
384 KB |
Output is correct |
8 |
Correct |
2 ms |
384 KB |
Output is correct |
9 |
Correct |
2 ms |
384 KB |
Output is correct |
10 |
Correct |
2 ms |
384 KB |
Output is correct |
11 |
Correct |
3 ms |
384 KB |
Output is correct |
12 |
Correct |
2 ms |
384 KB |
Output is correct |
13 |
Correct |
3 ms |
412 KB |
Output is correct |
14 |
Correct |
2 ms |
384 KB |
Output is correct |
15 |
Correct |
2 ms |
384 KB |
Output is correct |
16 |
Correct |
2 ms |
384 KB |
Output is correct |
17 |
Correct |
3 ms |
384 KB |
Output is correct |
18 |
Correct |
2 ms |
384 KB |
Output is correct |
19 |
Correct |
2 ms |
384 KB |
Output is correct |
20 |
Correct |
2 ms |
384 KB |
Output is correct |
21 |
Correct |
2 ms |
384 KB |
Output is correct |
22 |
Correct |
2 ms |
384 KB |
Output is correct |
23 |
Correct |
2 ms |
384 KB |
Output is correct |
24 |
Correct |
2 ms |
384 KB |
Output is correct |
25 |
Correct |
4 ms |
640 KB |
Output is correct |
26 |
Correct |
5 ms |
640 KB |
Output is correct |
27 |
Correct |
4 ms |
640 KB |
Output is correct |
28 |
Correct |
5 ms |
640 KB |
Output is correct |
29 |
Correct |
4 ms |
640 KB |
Output is correct |
30 |
Correct |
5 ms |
640 KB |
Output is correct |
31 |
Correct |
5 ms |
768 KB |
Output is correct |
32 |
Correct |
4 ms |
640 KB |
Output is correct |
33 |
Correct |
4 ms |
640 KB |
Output is correct |
34 |
Correct |
5 ms |
768 KB |
Output is correct |
35 |
Correct |
3 ms |
640 KB |
Output is correct |
36 |
Correct |
4 ms |
640 KB |
Output is correct |
37 |
Correct |
5 ms |
768 KB |
Output is correct |
38 |
Correct |
6 ms |
640 KB |
Output is correct |
39 |
Correct |
4 ms |
640 KB |
Output is correct |
40 |
Correct |
3 ms |
640 KB |
Output is correct |
41 |
Correct |
4 ms |
768 KB |
Output is correct |
42 |
Correct |
5 ms |
768 KB |
Output is correct |
43 |
Correct |
4 ms |
768 KB |
Output is correct |
44 |
Correct |
4 ms |
768 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
384 KB |
Output is correct |
2 |
Correct |
2 ms |
384 KB |
Output is correct |
3 |
Correct |
2 ms |
384 KB |
Output is correct |
4 |
Correct |
2 ms |
384 KB |
Output is correct |
5 |
Correct |
2 ms |
384 KB |
Output is correct |
6 |
Correct |
2 ms |
384 KB |
Output is correct |
7 |
Correct |
3 ms |
384 KB |
Output is correct |
8 |
Correct |
2 ms |
384 KB |
Output is correct |
9 |
Correct |
2 ms |
384 KB |
Output is correct |
10 |
Correct |
2 ms |
384 KB |
Output is correct |
11 |
Correct |
3 ms |
384 KB |
Output is correct |
12 |
Correct |
2 ms |
384 KB |
Output is correct |
13 |
Correct |
3 ms |
412 KB |
Output is correct |
14 |
Correct |
2 ms |
384 KB |
Output is correct |
15 |
Correct |
2 ms |
384 KB |
Output is correct |
16 |
Correct |
2 ms |
384 KB |
Output is correct |
17 |
Correct |
3 ms |
384 KB |
Output is correct |
18 |
Correct |
2 ms |
384 KB |
Output is correct |
19 |
Correct |
2 ms |
384 KB |
Output is correct |
20 |
Correct |
2 ms |
384 KB |
Output is correct |
21 |
Correct |
2 ms |
384 KB |
Output is correct |
22 |
Correct |
2 ms |
384 KB |
Output is correct |
23 |
Correct |
2 ms |
384 KB |
Output is correct |
24 |
Correct |
2 ms |
384 KB |
Output is correct |
25 |
Correct |
4 ms |
640 KB |
Output is correct |
26 |
Correct |
5 ms |
640 KB |
Output is correct |
27 |
Correct |
4 ms |
640 KB |
Output is correct |
28 |
Correct |
5 ms |
640 KB |
Output is correct |
29 |
Correct |
4 ms |
640 KB |
Output is correct |
30 |
Correct |
5 ms |
640 KB |
Output is correct |
31 |
Correct |
5 ms |
768 KB |
Output is correct |
32 |
Correct |
4 ms |
640 KB |
Output is correct |
33 |
Correct |
4 ms |
640 KB |
Output is correct |
34 |
Correct |
5 ms |
768 KB |
Output is correct |
35 |
Correct |
3 ms |
640 KB |
Output is correct |
36 |
Correct |
4 ms |
640 KB |
Output is correct |
37 |
Correct |
5 ms |
768 KB |
Output is correct |
38 |
Correct |
6 ms |
640 KB |
Output is correct |
39 |
Correct |
4 ms |
640 KB |
Output is correct |
40 |
Correct |
3 ms |
640 KB |
Output is correct |
41 |
Correct |
4 ms |
768 KB |
Output is correct |
42 |
Correct |
5 ms |
768 KB |
Output is correct |
43 |
Correct |
4 ms |
768 KB |
Output is correct |
44 |
Correct |
4 ms |
768 KB |
Output is correct |
45 |
Correct |
239 ms |
11848 KB |
Output is correct |
46 |
Correct |
228 ms |
13252 KB |
Output is correct |
47 |
Correct |
198 ms |
11000 KB |
Output is correct |
48 |
Correct |
208 ms |
13048 KB |
Output is correct |
49 |
Correct |
230 ms |
11256 KB |
Output is correct |
50 |
Correct |
190 ms |
12792 KB |
Output is correct |
51 |
Correct |
236 ms |
12816 KB |
Output is correct |
52 |
Correct |
142 ms |
10460 KB |
Output is correct |
53 |
Correct |
197 ms |
10460 KB |
Output is correct |
54 |
Correct |
244 ms |
19960 KB |
Output is correct |
55 |
Correct |
246 ms |
15396 KB |
Output is correct |
56 |
Correct |
237 ms |
15228 KB |
Output is correct |
57 |
Correct |
205 ms |
10616 KB |
Output is correct |
58 |
Correct |
148 ms |
10592 KB |
Output is correct |
59 |
Correct |
176 ms |
10524 KB |
Output is correct |
60 |
Correct |
212 ms |
10616 KB |
Output is correct |
61 |
Correct |
206 ms |
10540 KB |
Output is correct |
62 |
Correct |
201 ms |
10488 KB |
Output is correct |
63 |
Correct |
215 ms |
10616 KB |
Output is correct |
64 |
Correct |
222 ms |
10616 KB |
Output is correct |
65 |
Correct |
334 ms |
19960 KB |
Output is correct |
66 |
Correct |
346 ms |
19960 KB |
Output is correct |
67 |
Correct |
210 ms |
15224 KB |
Output is correct |
68 |
Correct |
224 ms |
15224 KB |
Output is correct |
69 |
Correct |
220 ms |
14712 KB |
Output is correct |
70 |
Correct |
246 ms |
14748 KB |
Output is correct |
71 |
Correct |
223 ms |
19932 KB |
Output is correct |
72 |
Correct |
217 ms |
20004 KB |
Output is correct |
73 |
Correct |
235 ms |
16760 KB |
Output is correct |
74 |
Correct |
248 ms |
16760 KB |
Output is correct |
75 |
Correct |
197 ms |
16164 KB |
Output is correct |
76 |
Correct |
206 ms |
19960 KB |
Output is correct |
77 |
Correct |
219 ms |
20048 KB |
Output is correct |
78 |
Correct |
210 ms |
12792 KB |
Output is correct |
79 |
Correct |
222 ms |
11896 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
384 KB |
Output is correct |
2 |
Correct |
2 ms |
384 KB |
Output is correct |
3 |
Correct |
2 ms |
384 KB |
Output is correct |
4 |
Correct |
2 ms |
384 KB |
Output is correct |
5 |
Correct |
2 ms |
384 KB |
Output is correct |
6 |
Correct |
2 ms |
384 KB |
Output is correct |
7 |
Correct |
3 ms |
384 KB |
Output is correct |
8 |
Correct |
2 ms |
384 KB |
Output is correct |
9 |
Correct |
2 ms |
384 KB |
Output is correct |
10 |
Correct |
2 ms |
384 KB |
Output is correct |
11 |
Correct |
3 ms |
384 KB |
Output is correct |
12 |
Correct |
2 ms |
384 KB |
Output is correct |
13 |
Correct |
3 ms |
412 KB |
Output is correct |
14 |
Correct |
2 ms |
384 KB |
Output is correct |
15 |
Correct |
2 ms |
384 KB |
Output is correct |
16 |
Correct |
2 ms |
384 KB |
Output is correct |
17 |
Correct |
3 ms |
384 KB |
Output is correct |
18 |
Correct |
2 ms |
384 KB |
Output is correct |
19 |
Correct |
2 ms |
384 KB |
Output is correct |
20 |
Correct |
2 ms |
384 KB |
Output is correct |
21 |
Correct |
2 ms |
384 KB |
Output is correct |
22 |
Correct |
2 ms |
384 KB |
Output is correct |
23 |
Correct |
2 ms |
384 KB |
Output is correct |
24 |
Correct |
2 ms |
384 KB |
Output is correct |
25 |
Correct |
4 ms |
640 KB |
Output is correct |
26 |
Correct |
5 ms |
640 KB |
Output is correct |
27 |
Correct |
4 ms |
640 KB |
Output is correct |
28 |
Correct |
5 ms |
640 KB |
Output is correct |
29 |
Correct |
4 ms |
640 KB |
Output is correct |
30 |
Correct |
5 ms |
640 KB |
Output is correct |
31 |
Correct |
5 ms |
768 KB |
Output is correct |
32 |
Correct |
4 ms |
640 KB |
Output is correct |
33 |
Correct |
4 ms |
640 KB |
Output is correct |
34 |
Correct |
5 ms |
768 KB |
Output is correct |
35 |
Correct |
3 ms |
640 KB |
Output is correct |
36 |
Correct |
4 ms |
640 KB |
Output is correct |
37 |
Correct |
5 ms |
768 KB |
Output is correct |
38 |
Correct |
6 ms |
640 KB |
Output is correct |
39 |
Correct |
4 ms |
640 KB |
Output is correct |
40 |
Correct |
3 ms |
640 KB |
Output is correct |
41 |
Correct |
4 ms |
768 KB |
Output is correct |
42 |
Correct |
5 ms |
768 KB |
Output is correct |
43 |
Correct |
4 ms |
768 KB |
Output is correct |
44 |
Correct |
4 ms |
768 KB |
Output is correct |
45 |
Correct |
239 ms |
11848 KB |
Output is correct |
46 |
Correct |
228 ms |
13252 KB |
Output is correct |
47 |
Correct |
198 ms |
11000 KB |
Output is correct |
48 |
Correct |
208 ms |
13048 KB |
Output is correct |
49 |
Correct |
230 ms |
11256 KB |
Output is correct |
50 |
Correct |
190 ms |
12792 KB |
Output is correct |
51 |
Correct |
236 ms |
12816 KB |
Output is correct |
52 |
Correct |
142 ms |
10460 KB |
Output is correct |
53 |
Correct |
197 ms |
10460 KB |
Output is correct |
54 |
Correct |
244 ms |
19960 KB |
Output is correct |
55 |
Correct |
246 ms |
15396 KB |
Output is correct |
56 |
Correct |
237 ms |
15228 KB |
Output is correct |
57 |
Correct |
205 ms |
10616 KB |
Output is correct |
58 |
Correct |
148 ms |
10592 KB |
Output is correct |
59 |
Correct |
176 ms |
10524 KB |
Output is correct |
60 |
Correct |
212 ms |
10616 KB |
Output is correct |
61 |
Correct |
206 ms |
10540 KB |
Output is correct |
62 |
Correct |
201 ms |
10488 KB |
Output is correct |
63 |
Correct |
215 ms |
10616 KB |
Output is correct |
64 |
Correct |
222 ms |
10616 KB |
Output is correct |
65 |
Correct |
334 ms |
19960 KB |
Output is correct |
66 |
Correct |
346 ms |
19960 KB |
Output is correct |
67 |
Correct |
210 ms |
15224 KB |
Output is correct |
68 |
Correct |
224 ms |
15224 KB |
Output is correct |
69 |
Correct |
220 ms |
14712 KB |
Output is correct |
70 |
Correct |
246 ms |
14748 KB |
Output is correct |
71 |
Correct |
223 ms |
19932 KB |
Output is correct |
72 |
Correct |
217 ms |
20004 KB |
Output is correct |
73 |
Correct |
235 ms |
16760 KB |
Output is correct |
74 |
Correct |
248 ms |
16760 KB |
Output is correct |
75 |
Correct |
197 ms |
16164 KB |
Output is correct |
76 |
Correct |
206 ms |
19960 KB |
Output is correct |
77 |
Correct |
219 ms |
20048 KB |
Output is correct |
78 |
Correct |
210 ms |
12792 KB |
Output is correct |
79 |
Correct |
222 ms |
11896 KB |
Output is correct |
80 |
Correct |
3164 ms |
106152 KB |
Output is correct |
81 |
Correct |
3095 ms |
105080 KB |
Output is correct |
82 |
Correct |
3021 ms |
101272 KB |
Output is correct |
83 |
Correct |
3137 ms |
105088 KB |
Output is correct |
84 |
Correct |
2964 ms |
106232 KB |
Output is correct |
85 |
Correct |
2820 ms |
102060 KB |
Output is correct |
86 |
Correct |
3001 ms |
105336 KB |
Output is correct |
87 |
Correct |
2086 ms |
100600 KB |
Output is correct |
88 |
Correct |
3165 ms |
100472 KB |
Output is correct |
89 |
Correct |
3469 ms |
194316 KB |
Output is correct |
90 |
Correct |
3452 ms |
147212 KB |
Output is correct |
91 |
Correct |
3368 ms |
147412 KB |
Output is correct |
92 |
Correct |
2845 ms |
100316 KB |
Output is correct |
93 |
Correct |
2044 ms |
100296 KB |
Output is correct |
94 |
Correct |
2773 ms |
100420 KB |
Output is correct |
95 |
Correct |
2904 ms |
100316 KB |
Output is correct |
96 |
Correct |
2870 ms |
100336 KB |
Output is correct |
97 |
Correct |
2688 ms |
100396 KB |
Output is correct |
98 |
Correct |
2752 ms |
100472 KB |
Output is correct |
99 |
Correct |
2687 ms |
100344 KB |
Output is correct |
100 |
Correct |
5028 ms |
194424 KB |
Output is correct |
101 |
Correct |
5157 ms |
208764 KB |
Output is correct |
102 |
Correct |
3119 ms |
162240 KB |
Output is correct |
103 |
Correct |
3131 ms |
162040 KB |
Output is correct |
104 |
Correct |
3021 ms |
156760 KB |
Output is correct |
105 |
Correct |
2849 ms |
156648 KB |
Output is correct |
106 |
Correct |
3025 ms |
208904 KB |
Output is correct |
107 |
Correct |
3037 ms |
208824 KB |
Output is correct |
108 |
Correct |
2926 ms |
177528 KB |
Output is correct |
109 |
Correct |
3134 ms |
177668 KB |
Output is correct |
110 |
Correct |
2886 ms |
207232 KB |
Output is correct |
111 |
Correct |
2865 ms |
209004 KB |
Output is correct |
112 |
Correct |
2856 ms |
209040 KB |
Output is correct |
113 |
Correct |
2995 ms |
115784 KB |
Output is correct |
114 |
Correct |
2906 ms |
119456 KB |
Output is correct |