#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template<class T> using oset =
tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define ll long long
#define ld long double
#define ar array
#define vi vector<int>
#define vii vector<vector<int>>
#define pii pair<int, int>
#define pb push_back
#define all(x) x.begin(), x.end()
#define f first
#define s second
#define endl "\n"
const int MOD = 1e9+7;
const int inf = 1e9;
const ll linf = 1e18;
const int d4i[4]={-1, 0, 1, 0}, d4j[4]={0, 1, 0, -1};
const int d8i[8]={-1, -1, 0, 1, 1, 1, 0, -1}, d8j[8]={0, 1, 1, 1, 0, -1, -1, -1};
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
// -------------------------------------------------- Main Code --------------------------------------------------
const int N = 1e5+5, SQRT = 100;
vi g[N];
vector<pair<int, int>> dp[N];
int blocked[N];
void sol() {
int n, m, q; cin >> n >> m >> q;
for (int i = 1; i <= m; i++) {
int a, b; cin >> a >> b;
g[b].pb(a);
}
dp[1].pb({0, 1});
vi vis(n+1, 0);
for (int i = 2; i <= n; i++) {
vector<pii> temp;
temp.pb({0, i});
for (auto ch : g[i]) {
for (auto x : dp[ch]) {
x.f++; temp.pb(x);
}
}
sort(all(temp)); reverse(all(temp));
// removing the duplicates
for (auto &j : temp) {
if (vis[j.s]) continue;
vis[j.s] = true;
dp[i].pb(j);
if (dp[i].size() == SQRT) break;
}
for (auto &j : dp[i]) vis[j.s] = false;
}
while (q--) {
int city, y; cin >> city >> y;
vi cities;
for (int i = 0; i < y; i++) {int x; cin >> x; cities.pb(x); blocked[x] = 1;}
if (y >= SQRT) {
vi dpp(n+1);
for (int i = 1; i <= city; i++) {
dpp[i] = (blocked[i]?-inf:0);
for (auto ch : g[i]) {
dpp[i] = max(dpp[i], 1+dpp[ch]);
}
}
cout << (dpp[city]<0?-1:dpp[city]) << endl;
}
else {
int ans = -1;
for (auto &i : dp[city]) {
if (!blocked[i.s]) {ans = i.f; break;}
}
if (!blocked[city]) cout << max(ans, 0) << endl;
else cout << ans << endl;
}
// reset blocked array
for (auto &i : cities) blocked[i] = 0;
}
}
int main () {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int t = 1;
// cin >> t;
while (t--) {
sol();
}
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
5212 KB |
Output is correct |
2 |
Correct |
2 ms |
5140 KB |
Output is correct |
3 |
Correct |
1 ms |
5212 KB |
Output is correct |
4 |
Correct |
2 ms |
5212 KB |
Output is correct |
5 |
Correct |
4 ms |
5724 KB |
Output is correct |
6 |
Correct |
4 ms |
5720 KB |
Output is correct |
7 |
Correct |
7 ms |
5720 KB |
Output is correct |
8 |
Correct |
9 ms |
6488 KB |
Output is correct |
9 |
Correct |
7 ms |
6232 KB |
Output is correct |
10 |
Correct |
7 ms |
6236 KB |
Output is correct |
11 |
Correct |
8 ms |
6244 KB |
Output is correct |
12 |
Correct |
6 ms |
6004 KB |
Output is correct |
13 |
Correct |
8 ms |
6236 KB |
Output is correct |
14 |
Correct |
7 ms |
5820 KB |
Output is correct |
15 |
Correct |
5 ms |
5724 KB |
Output is correct |
16 |
Correct |
7 ms |
5908 KB |
Output is correct |
17 |
Correct |
7 ms |
5980 KB |
Output is correct |
18 |
Correct |
6 ms |
5980 KB |
Output is correct |
19 |
Correct |
7 ms |
5980 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
5212 KB |
Output is correct |
2 |
Correct |
2 ms |
5140 KB |
Output is correct |
3 |
Correct |
1 ms |
5212 KB |
Output is correct |
4 |
Correct |
2 ms |
5212 KB |
Output is correct |
5 |
Correct |
4 ms |
5724 KB |
Output is correct |
6 |
Correct |
4 ms |
5720 KB |
Output is correct |
7 |
Correct |
7 ms |
5720 KB |
Output is correct |
8 |
Correct |
9 ms |
6488 KB |
Output is correct |
9 |
Correct |
7 ms |
6232 KB |
Output is correct |
10 |
Correct |
7 ms |
6236 KB |
Output is correct |
11 |
Correct |
8 ms |
6244 KB |
Output is correct |
12 |
Correct |
6 ms |
6004 KB |
Output is correct |
13 |
Correct |
8 ms |
6236 KB |
Output is correct |
14 |
Correct |
7 ms |
5820 KB |
Output is correct |
15 |
Correct |
5 ms |
5724 KB |
Output is correct |
16 |
Correct |
7 ms |
5908 KB |
Output is correct |
17 |
Correct |
7 ms |
5980 KB |
Output is correct |
18 |
Correct |
6 ms |
5980 KB |
Output is correct |
19 |
Correct |
7 ms |
5980 KB |
Output is correct |
20 |
Correct |
1272 ms |
8028 KB |
Output is correct |
21 |
Correct |
1238 ms |
8000 KB |
Output is correct |
22 |
Correct |
1283 ms |
8008 KB |
Output is correct |
23 |
Correct |
1214 ms |
8892 KB |
Output is correct |
24 |
Correct |
718 ms |
86836 KB |
Output is correct |
25 |
Correct |
737 ms |
88272 KB |
Output is correct |
26 |
Correct |
741 ms |
88380 KB |
Output is correct |
27 |
Correct |
565 ms |
111424 KB |
Output is correct |
28 |
Correct |
584 ms |
111432 KB |
Output is correct |
29 |
Correct |
567 ms |
111564 KB |
Output is correct |
30 |
Correct |
620 ms |
111668 KB |
Output is correct |
31 |
Correct |
686 ms |
109372 KB |
Output is correct |
32 |
Correct |
613 ms |
111312 KB |
Output is correct |
33 |
Correct |
559 ms |
73580 KB |
Output is correct |
34 |
Correct |
557 ms |
66724 KB |
Output is correct |
35 |
Correct |
541 ms |
72740 KB |
Output is correct |
36 |
Correct |
640 ms |
92092 KB |
Output is correct |
37 |
Correct |
699 ms |
87820 KB |
Output is correct |
38 |
Correct |
658 ms |
92472 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
5212 KB |
Output is correct |
2 |
Correct |
2 ms |
5140 KB |
Output is correct |
3 |
Correct |
1 ms |
5212 KB |
Output is correct |
4 |
Correct |
2 ms |
5212 KB |
Output is correct |
5 |
Correct |
4 ms |
5724 KB |
Output is correct |
6 |
Correct |
4 ms |
5720 KB |
Output is correct |
7 |
Correct |
7 ms |
5720 KB |
Output is correct |
8 |
Correct |
9 ms |
6488 KB |
Output is correct |
9 |
Correct |
7 ms |
6232 KB |
Output is correct |
10 |
Correct |
7 ms |
6236 KB |
Output is correct |
11 |
Correct |
8 ms |
6244 KB |
Output is correct |
12 |
Correct |
6 ms |
6004 KB |
Output is correct |
13 |
Correct |
8 ms |
6236 KB |
Output is correct |
14 |
Correct |
7 ms |
5820 KB |
Output is correct |
15 |
Correct |
5 ms |
5724 KB |
Output is correct |
16 |
Correct |
7 ms |
5908 KB |
Output is correct |
17 |
Correct |
7 ms |
5980 KB |
Output is correct |
18 |
Correct |
6 ms |
5980 KB |
Output is correct |
19 |
Correct |
7 ms |
5980 KB |
Output is correct |
20 |
Correct |
1272 ms |
8028 KB |
Output is correct |
21 |
Correct |
1238 ms |
8000 KB |
Output is correct |
22 |
Correct |
1283 ms |
8008 KB |
Output is correct |
23 |
Correct |
1214 ms |
8892 KB |
Output is correct |
24 |
Correct |
718 ms |
86836 KB |
Output is correct |
25 |
Correct |
737 ms |
88272 KB |
Output is correct |
26 |
Correct |
741 ms |
88380 KB |
Output is correct |
27 |
Correct |
565 ms |
111424 KB |
Output is correct |
28 |
Correct |
584 ms |
111432 KB |
Output is correct |
29 |
Correct |
567 ms |
111564 KB |
Output is correct |
30 |
Correct |
620 ms |
111668 KB |
Output is correct |
31 |
Correct |
686 ms |
109372 KB |
Output is correct |
32 |
Correct |
613 ms |
111312 KB |
Output is correct |
33 |
Correct |
559 ms |
73580 KB |
Output is correct |
34 |
Correct |
557 ms |
66724 KB |
Output is correct |
35 |
Correct |
541 ms |
72740 KB |
Output is correct |
36 |
Correct |
640 ms |
92092 KB |
Output is correct |
37 |
Correct |
699 ms |
87820 KB |
Output is correct |
38 |
Correct |
658 ms |
92472 KB |
Output is correct |
39 |
Correct |
759 ms |
86908 KB |
Output is correct |
40 |
Correct |
746 ms |
87120 KB |
Output is correct |
41 |
Correct |
960 ms |
87916 KB |
Output is correct |
42 |
Correct |
787 ms |
87584 KB |
Output is correct |
43 |
Correct |
717 ms |
87280 KB |
Output is correct |
44 |
Correct |
1292 ms |
8224 KB |
Output is correct |
45 |
Correct |
1284 ms |
9944 KB |
Output is correct |
46 |
Correct |
1330 ms |
9896 KB |
Output is correct |
47 |
Correct |
1291 ms |
9944 KB |
Output is correct |
48 |
Correct |
1268 ms |
9504 KB |
Output is correct |
49 |
Correct |
614 ms |
114472 KB |
Output is correct |
50 |
Correct |
785 ms |
113612 KB |
Output is correct |
51 |
Correct |
1272 ms |
10292 KB |
Output is correct |
52 |
Correct |
1315 ms |
9632 KB |
Output is correct |
53 |
Correct |
684 ms |
94740 KB |
Output is correct |
54 |
Correct |
716 ms |
90264 KB |
Output is correct |
55 |
Correct |
885 ms |
93896 KB |
Output is correct |
56 |
Correct |
931 ms |
90108 KB |
Output is correct |
57 |
Correct |
1304 ms |
10508 KB |
Output is correct |
58 |
Correct |
1301 ms |
10380 KB |
Output is correct |
59 |
Correct |
1321 ms |
9596 KB |
Output is correct |
60 |
Correct |
1332 ms |
10072 KB |
Output is correct |
61 |
Correct |
604 ms |
113660 KB |
Output is correct |
62 |
Correct |
687 ms |
94596 KB |
Output is correct |
63 |
Correct |
720 ms |
89648 KB |
Output is correct |
64 |
Correct |
686 ms |
113536 KB |
Output is correct |
65 |
Correct |
799 ms |
94204 KB |
Output is correct |
66 |
Correct |
833 ms |
90180 KB |
Output is correct |
67 |
Correct |
800 ms |
113724 KB |
Output is correct |
68 |
Correct |
897 ms |
94664 KB |
Output is correct |
69 |
Correct |
921 ms |
89036 KB |
Output is correct |
70 |
Correct |
565 ms |
113824 KB |
Output is correct |
71 |
Correct |
647 ms |
94668 KB |
Output is correct |
72 |
Correct |
698 ms |
89952 KB |
Output is correct |
73 |
Correct |
596 ms |
113996 KB |
Output is correct |
74 |
Correct |
674 ms |
94680 KB |
Output is correct |
75 |
Correct |
691 ms |
89696 KB |
Output is correct |
76 |
Correct |
604 ms |
115080 KB |
Output is correct |
77 |
Correct |
785 ms |
114044 KB |
Output is correct |
78 |
Correct |
577 ms |
114168 KB |
Output is correct |
79 |
Correct |
1280 ms |
10408 KB |
Output is correct |
80 |
Correct |
1286 ms |
9804 KB |
Output is correct |
81 |
Correct |
1240 ms |
9904 KB |
Output is correct |
82 |
Correct |
646 ms |
114916 KB |
Output is correct |
83 |
Correct |
762 ms |
112928 KB |
Output is correct |
84 |
Correct |
825 ms |
114080 KB |
Output is correct |
85 |
Correct |
929 ms |
111872 KB |
Output is correct |
86 |
Correct |
613 ms |
114540 KB |
Output is correct |
87 |
Correct |
723 ms |
112340 KB |
Output is correct |
88 |
Correct |
1298 ms |
10660 KB |
Output is correct |
89 |
Correct |
1298 ms |
10476 KB |
Output is correct |
90 |
Correct |
1325 ms |
9616 KB |
Output is correct |
91 |
Correct |
1330 ms |
9632 KB |
Output is correct |
92 |
Correct |
1271 ms |
9724 KB |
Output is correct |
93 |
Correct |
1284 ms |
9564 KB |
Output is correct |
94 |
Correct |
589 ms |
76748 KB |
Output is correct |
95 |
Correct |
591 ms |
69716 KB |
Output is correct |
96 |
Correct |
758 ms |
75724 KB |
Output is correct |
97 |
Correct |
761 ms |
69584 KB |
Output is correct |
98 |
Correct |
567 ms |
76216 KB |
Output is correct |
99 |
Correct |
581 ms |
69360 KB |
Output is correct |
100 |
Correct |
1276 ms |
10500 KB |
Output is correct |
101 |
Correct |
1241 ms |
10780 KB |
Output is correct |
102 |
Correct |
1274 ms |
10436 KB |
Output is correct |
103 |
Correct |
1259 ms |
10740 KB |
Output is correct |
104 |
Correct |
1263 ms |
10140 KB |
Output is correct |
105 |
Correct |
1226 ms |
10564 KB |
Output is correct |
106 |
Correct |
693 ms |
95312 KB |
Output is correct |
107 |
Correct |
724 ms |
90940 KB |
Output is correct |
108 |
Correct |
913 ms |
94916 KB |
Output is correct |
109 |
Correct |
919 ms |
89832 KB |
Output is correct |
110 |
Correct |
656 ms |
95180 KB |
Output is correct |
111 |
Correct |
710 ms |
90508 KB |
Output is correct |
112 |
Correct |
1297 ms |
10580 KB |
Output is correct |
113 |
Correct |
1313 ms |
10368 KB |
Output is correct |
114 |
Correct |
1311 ms |
9780 KB |
Output is correct |
115 |
Correct |
1329 ms |
9912 KB |
Output is correct |
116 |
Correct |
1260 ms |
9656 KB |
Output is correct |
117 |
Correct |
1277 ms |
9780 KB |
Output is correct |
118 |
Correct |
599 ms |
113320 KB |
Output is correct |
119 |
Correct |
637 ms |
94028 KB |
Output is correct |
120 |
Correct |
698 ms |
89488 KB |
Output is correct |
121 |
Correct |
572 ms |
113396 KB |
Output is correct |
122 |
Correct |
657 ms |
93996 KB |
Output is correct |
123 |
Correct |
682 ms |
89544 KB |
Output is correct |
124 |
Correct |
560 ms |
113232 KB |
Output is correct |
125 |
Correct |
679 ms |
94200 KB |
Output is correct |
126 |
Correct |
695 ms |
89612 KB |
Output is correct |