oj.uz

Submission #446135

# Submission time Handle Problem Language Result Execution time Memory
446135 2021-07-21T04:32:46 Z Millad Bridges (APIO19_bridges) C++14
100 / 100
 2488 ms 32372 KB 
#include <bits/stdc++.h>
#define FOR(i, x, y) for (int i = x; i < y; i++)
typedef long long ll;
using namespace std;

const int B = 1000;

int n, m, q;

stack<int> stck;
int sz[100001], cmp[100001];

void reset() {
	iota(cmp + 1, cmp + 1 + n, 1);
	fill(sz + 1, sz + n + 1, 1);
}

inline int find(int a) {
	while (cmp[a] != a) a = cmp[a];
	return a;
}

void onion(int a, int b) {
	a = find(a), b = find(b);
	if (a == b) return;
	if (sz[a] > sz[b]) swap(a, b);
	stck.push(a);
	sz[b] += sz[a];
	cmp[a] = cmp[b];
}

void rollback(int x) {
	while (stck.size() > x) {
		int k = stck.top();
		stck.pop();
		sz[cmp[k]] -= sz[k];
		cmp[k] = k;
	}
}

int u[100001], v[100001], w[100001];
int t[100001], x[100001], y[100001];
bool changed[100001];
vector<int> to_join[B];
int ans[100001];

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> m;
	FOR(i, 1, m + 1) cin >> u[i] >> v[i] >> w[i];
	cin >> q;
	FOR(i, 1, q + 1) cin >> t[i] >> x[i] >> y[i];

	for (int l = 1; l <= q; l += B) {
		int r = min(q + 1, l + B);
		reset();
		fill(changed + 1, changed + m + 1, false);

		vector<int> ask, upd, unchanged;
		FOR(i, l, r) {
			if (t[i] == 1) {
				changed[x[i]] = true;
				upd.push_back(i);
			} else ask.push_back(i);
		}
		FOR(i, 1, m + 1) if (!changed[i]) unchanged.push_back(i);

		FOR(i, l, r) {
			if (t[i] == 1) w[x[i]] = y[i];
			else {
				to_join[i - l].clear();
				for (int j : upd) if (w[x[j]] >= y[i]) to_join[i - l].push_back(x[j]);
			}
		}

		sort(ask.begin(), ask.end(), [&](int a, int b) { return y[a] > y[b]; });
		sort(unchanged.begin(), unchanged.end(), [&](int a, int b) { return w[a] > w[b]; });

		int ptr = 0;
		for (int i : ask) {
			while (ptr < unchanged.size() && w[unchanged[ptr]] >= y[i]) {
				onion(u[unchanged[ptr]], v[unchanged[ptr]]);
				ptr++;
			}
			int prev_size = stck.size();
			for (int j : to_join[i - l]) onion(u[j], v[j]);
			ans[i] = sz[find(x[i])];
			rollback(prev_size);
		}
	}

	FOR(i, 1, q + 1) if (t[i] == 2) cout << ans[i] << '\n';
	return 0;
}

Compilation message

bridges.cpp: In function 'void rollback(int)':
bridges.cpp:33:21: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   33 |  while (stck.size() > x) {
      |         ~~~~~~~~~~~~^~~
bridges.cpp: In function 'int main()':
bridges.cpp:82:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   82 |    while (ptr < unchanged.size() && w[unchanged[ptr]] >= y[i]) {
      |           ~~~~^~~~~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 39 ms 2884 KB Output is correct
4 Correct 5 ms 588 KB Output is correct
5 Correct 41 ms 2968 KB Output is correct
6 Correct 31 ms 2664 KB Output is correct
7 Correct 39 ms 3652 KB Output is correct
8 Correct 41 ms 2756 KB Output is correct
9 Correct 50 ms 4368 KB Output is correct
10 Correct 42 ms 2904 KB Output is correct
11 Correct 43 ms 2824 KB Output is correct
12 Correct 51 ms 2884 KB Output is correct
13 Correct 48 ms 2856 KB Output is correct
14 Correct 45 ms 2816 KB Output is correct
15 Correct 51 ms 2728 KB Output is correct
16 Correct 44 ms 3992 KB Output is correct
17 Correct 46 ms 3492 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1473 ms 28884 KB Output is correct
2 Correct 1469 ms 28816 KB Output is correct
3 Correct 1474 ms 28824 KB Output is correct
4 Correct 1520 ms 28844 KB Output is correct
5 Correct 1528 ms 29188 KB Output is correct
6 Correct 2209 ms 30432 KB Output is correct
7 Correct 2208 ms 30624 KB Output is correct
8 Correct 2163 ms 30688 KB Output is correct
9 Correct 44 ms 3396 KB Output is correct
10 Correct 1252 ms 29640 KB Output is correct
11 Correct 1158 ms 29768 KB Output is correct
12 Correct 1276 ms 27324 KB Output is correct
13 Correct 1332 ms 30192 KB Output is correct

Subtask #3
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1208 ms 21096 KB Output is correct
2 Correct 953 ms 11348 KB Output is correct
3 Correct 1450 ms 22780 KB Output is correct
4 Correct 1170 ms 21232 KB Output is correct
5 Correct 44 ms 3396 KB Output is correct
6 Correct 1320 ms 21020 KB Output is correct
7 Correct 1087 ms 20672 KB Output is correct
8 Correct 957 ms 20772 KB Output is correct
9 Correct 772 ms 19280 KB Output is correct
10 Correct 701 ms 19292 KB Output is correct
11 Correct 833 ms 22120 KB Output is correct
12 Correct 723 ms 22212 KB Output is correct

Subtask #4
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1693 ms 28748 KB Output is correct
2 Correct 44 ms 3396 KB Output is correct
3 Correct 184 ms 4500 KB Output is correct
4 Correct 96 ms 4656 KB Output is correct
5 Correct 855 ms 27176 KB Output is correct
6 Correct 1699 ms 28656 KB Output is correct
7 Correct 861 ms 27244 KB Output is correct
8 Correct 818 ms 26612 KB Output is correct
9 Correct 804 ms 26648 KB Output is correct
10 Correct 815 ms 26592 KB Output is correct
11 Correct 1239 ms 27940 KB Output is correct
12 Correct 1229 ms 28100 KB Output is correct
13 Correct 1232 ms 28036 KB Output is correct
14 Correct 795 ms 27280 KB Output is correct
15 Correct 823 ms 27120 KB Output is correct
16 Correct 1732 ms 28780 KB Output is correct
17 Correct 1762 ms 28792 KB Output is correct
18 Correct 1752 ms 29136 KB Output is correct
19 Correct 1690 ms 29228 KB Output is correct
20 Correct 1456 ms 28324 KB Output is correct
21 Correct 1404 ms 28252 KB Output is correct
22 Correct 1632 ms 28460 KB Output is correct
23 Correct 955 ms 25120 KB Output is correct

Subtask #5
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1473 ms 28884 KB Output is correct
2 Correct 1469 ms 28816 KB Output is correct
3 Correct 1474 ms 28824 KB Output is correct
4 Correct 1520 ms 28844 KB Output is correct
5 Correct 1528 ms 29188 KB Output is correct
6 Correct 2209 ms 30432 KB Output is correct
7 Correct 2208 ms 30624 KB Output is correct
8 Correct 2163 ms 30688 KB Output is correct
9 Correct 44 ms 3396 KB Output is correct
10 Correct 1252 ms 29640 KB Output is correct
11 Correct 1158 ms 29768 KB Output is correct
12 Correct 1276 ms 27324 KB Output is correct
13 Correct 1332 ms 30192 KB Output is correct
14 Correct 1208 ms 21096 KB Output is correct
15 Correct 953 ms 11348 KB Output is correct
16 Correct 1450 ms 22780 KB Output is correct
17 Correct 1170 ms 21232 KB Output is correct
18 Correct 44 ms 3396 KB Output is correct
19 Correct 1320 ms 21020 KB Output is correct
20 Correct 1087 ms 20672 KB Output is correct
21 Correct 957 ms 20772 KB Output is correct
22 Correct 772 ms 19280 KB Output is correct
23 Correct 701 ms 19292 KB Output is correct
24 Correct 833 ms 22120 KB Output is correct
25 Correct 723 ms 22212 KB Output is correct
26 Correct 1591 ms 28976 KB Output is correct
27 Correct 1889 ms 30540 KB Output is correct
28 Correct 1553 ms 29056 KB Output is correct
29 Correct 1103 ms 28580 KB Output is correct
30 Correct 1783 ms 30528 KB Output is correct
31 Correct 1819 ms 30564 KB Output is correct
32 Correct 1859 ms 30388 KB Output is correct
33 Correct 1563 ms 28788 KB Output is correct
34 Correct 1562 ms 28892 KB Output is correct
35 Correct 1543 ms 28964 KB Output is correct
36 Correct 1164 ms 28516 KB Output is correct
37 Correct 1124 ms 28636 KB Output is correct
38 Correct 1118 ms 28424 KB Output is correct
39 Correct 935 ms 27124 KB Output is correct
40 Correct 926 ms 27060 KB Output is correct
41 Correct 921 ms 27180 KB Output is correct
42 Correct 918 ms 29232 KB Output is correct
43 Correct 913 ms 28984 KB Output is correct
44 Correct 915 ms 28948 KB Output is correct

Subtask #6
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 39 ms 2884 KB Output is correct
4 Correct 5 ms 588 KB Output is correct
5 Correct 41 ms 2968 KB Output is correct
6 Correct 31 ms 2664 KB Output is correct
7 Correct 39 ms 3652 KB Output is correct
8 Correct 41 ms 2756 KB Output is correct
9 Correct 50 ms 4368 KB Output is correct
10 Correct 42 ms 2904 KB Output is correct
11 Correct 43 ms 2824 KB Output is correct
12 Correct 51 ms 2884 KB Output is correct
13 Correct 48 ms 2856 KB Output is correct
14 Correct 45 ms 2816 KB Output is correct
15 Correct 51 ms 2728 KB Output is correct
16 Correct 44 ms 3992 KB Output is correct
17 Correct 46 ms 3492 KB Output is correct
18 Correct 1473 ms 28884 KB Output is correct
19 Correct 1469 ms 28816 KB Output is correct
20 Correct 1474 ms 28824 KB Output is correct
21 Correct 1520 ms 28844 KB Output is correct
22 Correct 1528 ms 29188 KB Output is correct
23 Correct 2209 ms 30432 KB Output is correct
24 Correct 2208 ms 30624 KB Output is correct
25 Correct 2163 ms 30688 KB Output is correct
26 Correct 44 ms 3396 KB Output is correct
27 Correct 1252 ms 29640 KB Output is correct
28 Correct 1158 ms 29768 KB Output is correct
29 Correct 1276 ms 27324 KB Output is correct
30 Correct 1332 ms 30192 KB Output is correct
31 Correct 1208 ms 21096 KB Output is correct
32 Correct 953 ms 11348 KB Output is correct
33 Correct 1450 ms 22780 KB Output is correct
34 Correct 1170 ms 21232 KB Output is correct
35 Correct 44 ms 3396 KB Output is correct
36 Correct 1320 ms 21020 KB Output is correct
37 Correct 1087 ms 20672 KB Output is correct
38 Correct 957 ms 20772 KB Output is correct
39 Correct 772 ms 19280 KB Output is correct
40 Correct 701 ms 19292 KB Output is correct
41 Correct 833 ms 22120 KB Output is correct
42 Correct 723 ms 22212 KB Output is correct
43 Correct 1693 ms 28748 KB Output is correct
44 Correct 44 ms 3396 KB Output is correct
45 Correct 184 ms 4500 KB Output is correct
46 Correct 96 ms 4656 KB Output is correct
47 Correct 855 ms 27176 KB Output is correct
48 Correct 1699 ms 28656 KB Output is correct
49 Correct 861 ms 27244 KB Output is correct
50 Correct 818 ms 26612 KB Output is correct
51 Correct 804 ms 26648 KB Output is correct
52 Correct 815 ms 26592 KB Output is correct
53 Correct 1239 ms 27940 KB Output is correct
54 Correct 1229 ms 28100 KB Output is correct
55 Correct 1232 ms 28036 KB Output is correct
56 Correct 795 ms 27280 KB Output is correct
57 Correct 823 ms 27120 KB Output is correct
58 Correct 1732 ms 28780 KB Output is correct
59 Correct 1762 ms 28792 KB Output is correct
60 Correct 1752 ms 29136 KB Output is correct
61 Correct 1690 ms 29228 KB Output is correct
62 Correct 1456 ms 28324 KB Output is correct
63 Correct 1404 ms 28252 KB Output is correct
64 Correct 1632 ms 28460 KB Output is correct
65 Correct 955 ms 25120 KB Output is correct
66 Correct 1591 ms 28976 KB Output is correct
67 Correct 1889 ms 30540 KB Output is correct
68 Correct 1553 ms 29056 KB Output is correct
69 Correct 1103 ms 28580 KB Output is correct
70 Correct 1783 ms 30528 KB Output is correct
71 Correct 1819 ms 30564 KB Output is correct
72 Correct 1859 ms 30388 KB Output is correct
73 Correct 1563 ms 28788 KB Output is correct
74 Correct 1562 ms 28892 KB Output is correct
75 Correct 1543 ms 28964 KB Output is correct
76 Correct 1164 ms 28516 KB Output is correct
77 Correct 1124 ms 28636 KB Output is correct
78 Correct 1118 ms 28424 KB Output is correct
79 Correct 935 ms 27124 KB Output is correct
80 Correct 926 ms 27060 KB Output is correct
81 Correct 921 ms 27180 KB Output is correct
82 Correct 918 ms 29232 KB Output is correct
83 Correct 913 ms 28984 KB Output is correct
84 Correct 915 ms 28948 KB Output is correct
85 Correct 2215 ms 30812 KB Output is correct
86 Correct 213 ms 6560 KB Output is correct
87 Correct 143 ms 8000 KB Output is correct
88 Correct 1363 ms 31164 KB Output is correct
89 Correct 2198 ms 31076 KB Output is correct
90 Correct 1391 ms 31108 KB Output is correct
91 Correct 1613 ms 28820 KB Output is correct
92 Correct 1595 ms 28792 KB Output is correct
93 Correct 2321 ms 30172 KB Output is correct
94 Correct 1901 ms 30396 KB Output is correct
95 Correct 1877 ms 30460 KB Output is correct
96 Correct 2267 ms 32016 KB Output is correct
97 Correct 1048 ms 27860 KB Output is correct
98 Correct 1088 ms 31016 KB Output is correct
99 Correct 2229 ms 31420 KB Output is correct
100 Correct 2209 ms 31080 KB Output is correct
101 Correct 2273 ms 31632 KB Output is correct
102 Correct 2289 ms 31328 KB Output is correct
103 Correct 2480 ms 32372 KB Output is correct
104 Correct 2488 ms 32228 KB Output is correct
105 Correct 1836 ms 31996 KB Output is correct
106 Correct 1471 ms 31568 KB Output is correct
107 Correct 1729 ms 28948 KB Output is correct
108 Correct 2243 ms 31132 KB Output is correct
109 Correct 1701 ms 28924 KB Output is correct