oj.uz

Submission #771247

# Submission time Handle Problem Language Result Execution time Memory
771247 2023-07-02T17:26:50 Z siewjh Bridges (APIO19_bridges) C++17
100 / 100
 2976 ms 9180 KB 
#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 50005;
int par[MAXN], sz[MAXN];
vector<pair<int, int>> jst;
int root(int x){
	if (par[x] == -1) return x;
	else return root(par[x]);
}
void join(int a, int b){
	int ra = root(a), rb = root(b);
	if (ra == rb) return;
	if (sz[ra] < sz[rb]) swap(ra, rb); // ra larger
	par[rb] = ra;
	sz[ra] += sz[rb];
	jst.push_back({ra, rb});
}
void rollback(){
	while (!jst.empty()){
		int ra, rb; tie(ra, rb) = jst.back(); jst.pop_back();
		par[rb] = -1;
		sz[ra] -= sz[rb];
	}
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	int nodes, edges; cin >> nodes >> edges;
	vector<int> ea(edges + 1), eb(edges + 1), ew(edges + 1);
	for (int i = 1; i <= edges; i++){
		int a, b, w; cin >> a >> b >> w;
		ea[i] = a; eb[i] = b; ew[i] = w;
	}
	int queries; cin >> queries;
	vector<int> qt(queries), qx(queries), qw(queries);
	for (int i = 0; i < queries; i++){
		int typ, ind, w; cin >> typ >> ind >> w;
		qt[i] = typ; qx[i] = ind; qw[i] = w;
	}
	vector<int> ans(queries, -1);
	const int bsz = 420;
	vector<int> dyna[bsz];
	for (int l = 0; l < queries; l += bsz){
		int r = min(l + bsz, queries) - 1;
		for (int i = 1; i <= nodes; i++){
			par[i] = -1;
			sz[i] = 1;
		}
		vector<bool> ch(edges + 1, 0);
		vector<int> qv, stat, chv;
		for (int i = l; i <= r; i++){
			if (qt[i] == 1)
				ch[qx[i]] = 1;
		}
		for (int i = 1; i <= edges; i++){
			if (ch[i]) chv.push_back(i);
			else stat.push_back(i);
		}
		for (int i = l; i <= r; i++){
			int x = qx[i], w = qw[i];
			if (qt[i] == 1) ew[x] = w;
			else{
				qv.push_back(i);
				dyna[i - l].clear();
				for (int eind : chv)
					if (ew[eind] >= w)
						dyna[i - l].push_back(eind);
			}
		}
		sort(stat.begin(), stat.end(), [&](int a, int b){return ew[a] > ew[b];});
		sort(qv.begin(), qv.end(), [&](int a, int b){return qw[a] > qw[b];});
		int stind = 0;
		for (int qind : qv){
			int w = qw[qind], x = qx[qind];
			while (stind != stat.size() && ew[stat[stind]] >= w){
				int eind = stat[stind];
				join(ea[eind], eb[eind]);
				stind++;
			}
			jst.clear();
			for (int eind : dyna[qind - l]) join(ea[eind], eb[eind]);
			ans[qind] = sz[root(x)];
			rollback();
		}
	}
	for (int i = 0; i < queries; i++)
		if (ans[i] != -1)
			cout << ans[i] << '\n';
	return 0;
}

Compilation message

bridges.cpp: In function 'int main()':
bridges.cpp:76:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |    while (stind != stat.size() && ew[stat[stind]] >= w){
      |           ~~~~~~^~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 12 ms 1000 KB Output is correct
4 Correct 3 ms 468 KB Output is correct
5 Correct 7 ms 724 KB Output is correct
6 Correct 5 ms 724 KB Output is correct
7 Correct 6 ms 724 KB Output is correct
8 Correct 7 ms 724 KB Output is correct
9 Correct 7 ms 724 KB Output is correct
10 Correct 7 ms 724 KB Output is correct
11 Correct 8 ms 724 KB Output is correct
12 Correct 7 ms 724 KB Output is correct
13 Correct 8 ms 724 KB Output is correct
14 Correct 8 ms 740 KB Output is correct
15 Correct 8 ms 724 KB Output is correct
16 Correct 6 ms 736 KB Output is correct
17 Correct 6 ms 724 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1302 ms 4020 KB Output is correct
2 Correct 1299 ms 3856 KB Output is correct
3 Correct 1296 ms 4032 KB Output is correct
4 Correct 1282 ms 4004 KB Output is correct
5 Correct 1284 ms 3848 KB Output is correct
6 Correct 1395 ms 4312 KB Output is correct
7 Correct 1361 ms 4240 KB Output is correct
8 Correct 1366 ms 4288 KB Output is correct
9 Correct 24 ms 2044 KB Output is correct
10 Correct 580 ms 4000 KB Output is correct
11 Correct 619 ms 4104 KB Output is correct
12 Correct 1259 ms 4008 KB Output is correct
13 Correct 1233 ms 4572 KB Output is correct

Subtask #3
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 857 ms 3304 KB Output is correct
2 Correct 282 ms 2780 KB Output is correct
3 Correct 858 ms 3468 KB Output is correct
4 Correct 849 ms 3412 KB Output is correct
5 Correct 25 ms 2004 KB Output is correct
6 Correct 890 ms 3568 KB Output is correct
7 Correct 831 ms 3584 KB Output is correct
8 Correct 811 ms 3552 KB Output is correct
9 Correct 801 ms 3284 KB Output is correct
10 Correct 782 ms 3008 KB Output is correct
11 Correct 792 ms 3824 KB Output is correct
12 Correct 752 ms 3924 KB Output is correct

Subtask #4
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 2849 ms 4864 KB Output is correct
2 Correct 25 ms 2032 KB Output is correct
3 Correct 273 ms 2588 KB Output is correct
4 Correct 115 ms 2960 KB Output is correct
5 Correct 1300 ms 4916 KB Output is correct
6 Correct 2723 ms 4624 KB Output is correct
7 Correct 1269 ms 4976 KB Output is correct
8 Correct 1250 ms 3588 KB Output is correct
9 Correct 1203 ms 3348 KB Output is correct
10 Correct 1235 ms 4012 KB Output is correct
11 Correct 1998 ms 4152 KB Output is correct
12 Correct 1959 ms 4116 KB Output is correct
13 Correct 2052 ms 4436 KB Output is correct
14 Correct 1171 ms 4868 KB Output is correct
15 Correct 1234 ms 5156 KB Output is correct
16 Correct 2761 ms 4580 KB Output is correct
17 Correct 2809 ms 4516 KB Output is correct
18 Correct 2728 ms 4768 KB Output is correct
19 Correct 2753 ms 4400 KB Output is correct
20 Correct 2312 ms 4632 KB Output is correct
21 Correct 2374 ms 4612 KB Output is correct
22 Correct 2682 ms 4796 KB Output is correct
23 Correct 1487 ms 4428 KB Output is correct

Subtask #5
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1302 ms 4020 KB Output is correct
2 Correct 1299 ms 3856 KB Output is correct
3 Correct 1296 ms 4032 KB Output is correct
4 Correct 1282 ms 4004 KB Output is correct
5 Correct 1284 ms 3848 KB Output is correct
6 Correct 1395 ms 4312 KB Output is correct
7 Correct 1361 ms 4240 KB Output is correct
8 Correct 1366 ms 4288 KB Output is correct
9 Correct 24 ms 2044 KB Output is correct
10 Correct 580 ms 4000 KB Output is correct
11 Correct 619 ms 4104 KB Output is correct
12 Correct 1259 ms 4008 KB Output is correct
13 Correct 1233 ms 4572 KB Output is correct
14 Correct 857 ms 3304 KB Output is correct
15 Correct 282 ms 2780 KB Output is correct
16 Correct 858 ms 3468 KB Output is correct
17 Correct 849 ms 3412 KB Output is correct
18 Correct 25 ms 2004 KB Output is correct
19 Correct 890 ms 3568 KB Output is correct
20 Correct 831 ms 3584 KB Output is correct
21 Correct 811 ms 3552 KB Output is correct
22 Correct 801 ms 3284 KB Output is correct
23 Correct 782 ms 3008 KB Output is correct
24 Correct 792 ms 3824 KB Output is correct
25 Correct 752 ms 3924 KB Output is correct
26 Correct 1339 ms 3944 KB Output is correct
27 Correct 1393 ms 4056 KB Output is correct
28 Correct 1381 ms 3892 KB Output is correct
29 Correct 1295 ms 4220 KB Output is correct
30 Correct 1392 ms 3888 KB Output is correct
31 Correct 1393 ms 3908 KB Output is correct
32 Correct 1422 ms 4148 KB Output is correct
33 Correct 1383 ms 3852 KB Output is correct
34 Correct 1371 ms 3956 KB Output is correct
35 Correct 1363 ms 3932 KB Output is correct
36 Correct 1299 ms 4096 KB Output is correct
37 Correct 1323 ms 4036 KB Output is correct
38 Correct 1325 ms 4244 KB Output is correct
39 Correct 1251 ms 3720 KB Output is correct
40 Correct 1288 ms 3712 KB Output is correct
41 Correct 1268 ms 3720 KB Output is correct
42 Correct 1199 ms 4632 KB Output is correct
43 Correct 1203 ms 4684 KB Output is correct
44 Correct 1212 ms 4616 KB Output is correct

Subtask #6
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 12 ms 1000 KB Output is correct
4 Correct 3 ms 468 KB Output is correct
5 Correct 7 ms 724 KB Output is correct
6 Correct 5 ms 724 KB Output is correct
7 Correct 6 ms 724 KB Output is correct
8 Correct 7 ms 724 KB Output is correct
9 Correct 7 ms 724 KB Output is correct
10 Correct 7 ms 724 KB Output is correct
11 Correct 8 ms 724 KB Output is correct
12 Correct 7 ms 724 KB Output is correct
13 Correct 8 ms 724 KB Output is correct
14 Correct 8 ms 740 KB Output is correct
15 Correct 8 ms 724 KB Output is correct
16 Correct 6 ms 736 KB Output is correct
17 Correct 6 ms 724 KB Output is correct
18 Correct 1302 ms 4020 KB Output is correct
19 Correct 1299 ms 3856 KB Output is correct
20 Correct 1296 ms 4032 KB Output is correct
21 Correct 1282 ms 4004 KB Output is correct
22 Correct 1284 ms 3848 KB Output is correct
23 Correct 1395 ms 4312 KB Output is correct
24 Correct 1361 ms 4240 KB Output is correct
25 Correct 1366 ms 4288 KB Output is correct
26 Correct 24 ms 2044 KB Output is correct
27 Correct 580 ms 4000 KB Output is correct
28 Correct 619 ms 4104 KB Output is correct
29 Correct 1259 ms 4008 KB Output is correct
30 Correct 1233 ms 4572 KB Output is correct
31 Correct 857 ms 3304 KB Output is correct
32 Correct 282 ms 2780 KB Output is correct
33 Correct 858 ms 3468 KB Output is correct
34 Correct 849 ms 3412 KB Output is correct
35 Correct 25 ms 2004 KB Output is correct
36 Correct 890 ms 3568 KB Output is correct
37 Correct 831 ms 3584 KB Output is correct
38 Correct 811 ms 3552 KB Output is correct
39 Correct 801 ms 3284 KB Output is correct
40 Correct 782 ms 3008 KB Output is correct
41 Correct 792 ms 3824 KB Output is correct
42 Correct 752 ms 3924 KB Output is correct
43 Correct 2849 ms 4864 KB Output is correct
44 Correct 25 ms 2032 KB Output is correct
45 Correct 273 ms 2588 KB Output is correct
46 Correct 115 ms 2960 KB Output is correct
47 Correct 1300 ms 4916 KB Output is correct
48 Correct 2723 ms 4624 KB Output is correct
49 Correct 1269 ms 4976 KB Output is correct
50 Correct 1250 ms 3588 KB Output is correct
51 Correct 1203 ms 3348 KB Output is correct
52 Correct 1235 ms 4012 KB Output is correct
53 Correct 1998 ms 4152 KB Output is correct
54 Correct 1959 ms 4116 KB Output is correct
55 Correct 2052 ms 4436 KB Output is correct
56 Correct 1171 ms 4868 KB Output is correct
57 Correct 1234 ms 5156 KB Output is correct
58 Correct 2761 ms 4580 KB Output is correct
59 Correct 2809 ms 4516 KB Output is correct
60 Correct 2728 ms 4768 KB Output is correct
61 Correct 2753 ms 4400 KB Output is correct
62 Correct 2312 ms 4632 KB Output is correct
63 Correct 2374 ms 4612 KB Output is correct
64 Correct 2682 ms 4796 KB Output is correct
65 Correct 1487 ms 4428 KB Output is correct
66 Correct 1339 ms 3944 KB Output is correct
67 Correct 1393 ms 4056 KB Output is correct
68 Correct 1381 ms 3892 KB Output is correct
69 Correct 1295 ms 4220 KB Output is correct
70 Correct 1392 ms 3888 KB Output is correct
71 Correct 1393 ms 3908 KB Output is correct
72 Correct 1422 ms 4148 KB Output is correct
73 Correct 1383 ms 3852 KB Output is correct
74 Correct 1371 ms 3956 KB Output is correct
75 Correct 1363 ms 3932 KB Output is correct
76 Correct 1299 ms 4096 KB Output is correct
77 Correct 1323 ms 4036 KB Output is correct
78 Correct 1325 ms 4244 KB Output is correct
79 Correct 1251 ms 3720 KB Output is correct
80 Correct 1288 ms 3712 KB Output is correct
81 Correct 1268 ms 3720 KB Output is correct
82 Correct 1199 ms 4632 KB Output is correct
83 Correct 1203 ms 4684 KB Output is correct
84 Correct 1212 ms 4616 KB Output is correct
85 Correct 2894 ms 5216 KB Output is correct
86 Correct 284 ms 3064 KB Output is correct
87 Correct 117 ms 3044 KB Output is correct
88 Correct 1458 ms 5340 KB Output is correct
89 Correct 2905 ms 5252 KB Output is correct
90 Correct 1418 ms 5448 KB Output is correct
91 Correct 1356 ms 3948 KB Output is correct
92 Correct 1377 ms 4100 KB Output is correct
93 Correct 1417 ms 4208 KB Output is correct
94 Correct 2212 ms 4648 KB Output is correct
95 Correct 2133 ms 4716 KB Output is correct
96 Correct 2163 ms 4832 KB Output is correct
97 Correct 1369 ms 5208 KB Output is correct
98 Correct 1365 ms 5616 KB Output is correct
99 Correct 2904 ms 4960 KB Output is correct
100 Correct 2894 ms 5216 KB Output is correct
101 Correct 2976 ms 8932 KB Output is correct
102 Correct 2895 ms 8932 KB Output is correct
103 Correct 2468 ms 8268 KB Output is correct
104 Correct 2480 ms 8304 KB Output is correct
105 Correct 2412 ms 9180 KB Output is correct
106 Correct 2079 ms 8496 KB Output is correct
107 Correct 2367 ms 8212 KB Output is correct
108 Correct 2807 ms 8844 KB Output is correct
109 Correct 1619 ms 6964 KB Output is correct