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Submission #756667

# Submission time Handle Problem Language Result Execution time Memory
756667 2023-06-12T04:16:44 Z khoquennguoiminhthuong Bridges (APIO19_bridges) C++17
100 / 100
 2804 ms 25320 KB 
#include <bits/stdc++.h>

using namespace std;
int n,m,q;
struct canh {
    int u,v,w;
} e[500005];
int dd[200005],ans[200005];
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;
	}
}

bool cmpp(int a,int b) {
    if(e[a].w!=e[b].w)return e[a].w>e[b].w;
    return a<b;
}
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin>>n>>m;
    for(int i=1; i<=m; i++) {
        cin>>e[i].u>>e[i].v>>e[i].w;
    }
    cin>>q;
    for(int i=1; i<=q; i++)
        cin>>e[i+m].u>>e[i+m].v>>e[i+m].w;
    const int blsize=1000;
    for(int l=m+1; l<=q+m; l+=blsize) {
        int r=min(l+blsize-1,m+q);
        reset();
        vector<int>change;
        vector<int>unchange;
        for(int i=l; i<=r; i++) {
            if(e[i].u==1) {
                change.push_back(i);
                dd[e[i].v]=1;
            } else unchange.push_back(i);
        }
        for(int i=1; i<=m; i++)if(dd[i]==0)unchange.push_back(i);
            else dd[i]=0;
        sort(unchange.begin(),unchange.end(),cmpp);
        reverse(change.begin(),change.end());
        for(auto v:unchange) {
            if(v<=m) {
                onion(e[v].u,e[v].v);
            } else {
                int now=stck.size();
                for(auto vv:change) {
                    if(vv<=v&&dd[e[vv].v]==0) {
                        dd[e[vv].v]=1;
                        int id=e[vv].v;
                        if(e[vv].w>=e[v].w)onion(e[id].u,e[id].v);
                    }
                }
                for(auto vv:change) {
                    if(vv>v&&dd[e[vv].v]==0) {
                        int id=e[vv].v;
                        if(e[id].w>=e[v].w)onion(e[id].u,e[id].v);
                    }
                }
                ans[v]=sz[find(e[v].v)];
                rollback(now);
                for(auto vv:change)dd[e[vv].v]=0;
            }
        }
     for(int i=l;i<=r;i++)if(e[i].u==1){int id=e[i].v;e[id].w=e[i].w;}
    }
    for(int i=m+1; i<=m+q; i++)if(ans[i])cout<<ans[i]<<'\n';
    return 0;
}

Compilation message

bridges.cpp: In function 'void rollback(int)':
bridges.cpp:32:21: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   32 |  while (stck.size() > x) {
      |         ~~~~~~~~~~~~^~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 51 ms 660 KB Output is correct
4 Correct 5 ms 584 KB Output is correct
5 Correct 41 ms 628 KB Output is correct
6 Correct 35 ms 596 KB Output is correct
7 Correct 38 ms 556 KB Output is correct
8 Correct 40 ms 628 KB Output is correct
9 Correct 43 ms 556 KB Output is correct
10 Correct 43 ms 616 KB Output is correct
11 Correct 39 ms 596 KB Output is correct
12 Correct 42 ms 628 KB Output is correct
13 Correct 49 ms 556 KB Output is correct
14 Correct 50 ms 652 KB Output is correct
15 Correct 42 ms 552 KB Output is correct
16 Correct 41 ms 600 KB Output is correct
17 Correct 42 ms 564 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1762 ms 23832 KB Output is correct
2 Correct 1799 ms 23868 KB Output is correct
3 Correct 1667 ms 23896 KB Output is correct
4 Correct 1731 ms 23876 KB Output is correct
5 Correct 1750 ms 23860 KB Output is correct
6 Correct 2478 ms 24064 KB Output is correct
7 Correct 2523 ms 24048 KB Output is correct
8 Correct 2435 ms 24024 KB Output is correct
9 Correct 33 ms 2264 KB Output is correct
10 Correct 1557 ms 24044 KB Output is correct
11 Correct 1540 ms 23880 KB Output is correct
12 Correct 1429 ms 24288 KB Output is correct
13 Correct 1423 ms 23476 KB Output is correct

Subtask #3
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1310 ms 16304 KB Output is correct
2 Correct 1060 ms 5472 KB Output is correct
3 Correct 1537 ms 16464 KB Output is correct
4 Correct 1292 ms 16280 KB Output is correct
5 Correct 34 ms 2056 KB Output is correct
6 Correct 1465 ms 16412 KB Output is correct
7 Correct 1228 ms 16364 KB Output is correct
8 Correct 1089 ms 16392 KB Output is correct
9 Correct 847 ms 16728 KB Output is correct
10 Correct 780 ms 16476 KB Output is correct
11 Correct 901 ms 16056 KB Output is correct
12 Correct 784 ms 15948 KB Output is correct

Subtask #4
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1790 ms 24684 KB Output is correct
2 Correct 32 ms 2060 KB Output is correct
3 Correct 191 ms 2576 KB Output is correct
4 Correct 196 ms 2556 KB Output is correct
5 Correct 1555 ms 24796 KB Output is correct
6 Correct 1781 ms 24632 KB Output is correct
7 Correct 1511 ms 24852 KB Output is correct
8 Correct 870 ms 23848 KB Output is correct
9 Correct 868 ms 23752 KB Output is correct
10 Correct 872 ms 23968 KB Output is correct
11 Correct 1352 ms 24700 KB Output is correct
12 Correct 1334 ms 24724 KB Output is correct
13 Correct 1387 ms 24968 KB Output is correct
14 Correct 1419 ms 24740 KB Output is correct
15 Correct 1469 ms 24692 KB Output is correct
16 Correct 1807 ms 25080 KB Output is correct
17 Correct 1802 ms 24952 KB Output is correct
18 Correct 1810 ms 25320 KB Output is correct
19 Correct 1794 ms 25288 KB Output is correct
20 Correct 1505 ms 25064 KB Output is correct
21 Correct 1516 ms 25212 KB Output is correct
22 Correct 1737 ms 24744 KB Output is correct
23 Correct 1427 ms 22712 KB Output is correct

Subtask #5
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1762 ms 23832 KB Output is correct
2 Correct 1799 ms 23868 KB Output is correct
3 Correct 1667 ms 23896 KB Output is correct
4 Correct 1731 ms 23876 KB Output is correct
5 Correct 1750 ms 23860 KB Output is correct
6 Correct 2478 ms 24064 KB Output is correct
7 Correct 2523 ms 24048 KB Output is correct
8 Correct 2435 ms 24024 KB Output is correct
9 Correct 33 ms 2264 KB Output is correct
10 Correct 1557 ms 24044 KB Output is correct
11 Correct 1540 ms 23880 KB Output is correct
12 Correct 1429 ms 24288 KB Output is correct
13 Correct 1423 ms 23476 KB Output is correct
14 Correct 1310 ms 16304 KB Output is correct
15 Correct 1060 ms 5472 KB Output is correct
16 Correct 1537 ms 16464 KB Output is correct
17 Correct 1292 ms 16280 KB Output is correct
18 Correct 34 ms 2056 KB Output is correct
19 Correct 1465 ms 16412 KB Output is correct
20 Correct 1228 ms 16364 KB Output is correct
21 Correct 1089 ms 16392 KB Output is correct
22 Correct 847 ms 16728 KB Output is correct
23 Correct 780 ms 16476 KB Output is correct
24 Correct 901 ms 16056 KB Output is correct
25 Correct 784 ms 15948 KB Output is correct
26 Correct 1684 ms 23684 KB Output is correct
27 Correct 1981 ms 23896 KB Output is correct
28 Correct 1672 ms 23704 KB Output is correct
29 Correct 1308 ms 23800 KB Output is correct
30 Correct 1896 ms 23760 KB Output is correct
31 Correct 1964 ms 23892 KB Output is correct
32 Correct 1954 ms 23896 KB Output is correct
33 Correct 1656 ms 23752 KB Output is correct
34 Correct 1668 ms 23820 KB Output is correct
35 Correct 1682 ms 23916 KB Output is correct
36 Correct 1339 ms 23652 KB Output is correct
37 Correct 1340 ms 23812 KB Output is correct
38 Correct 1344 ms 23848 KB Output is correct
39 Correct 1047 ms 24088 KB Output is correct
40 Correct 1039 ms 23916 KB Output is correct
41 Correct 1042 ms 23992 KB Output is correct
42 Correct 1037 ms 23560 KB Output is correct
43 Correct 1025 ms 23504 KB Output is correct
44 Correct 1022 ms 23556 KB Output is correct

Subtask #6
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 51 ms 660 KB Output is correct
4 Correct 5 ms 584 KB Output is correct
5 Correct 41 ms 628 KB Output is correct
6 Correct 35 ms 596 KB Output is correct
7 Correct 38 ms 556 KB Output is correct
8 Correct 40 ms 628 KB Output is correct
9 Correct 43 ms 556 KB Output is correct
10 Correct 43 ms 616 KB Output is correct
11 Correct 39 ms 596 KB Output is correct
12 Correct 42 ms 628 KB Output is correct
13 Correct 49 ms 556 KB Output is correct
14 Correct 50 ms 652 KB Output is correct
15 Correct 42 ms 552 KB Output is correct
16 Correct 41 ms 600 KB Output is correct
17 Correct 42 ms 564 KB Output is correct
18 Correct 1762 ms 23832 KB Output is correct
19 Correct 1799 ms 23868 KB Output is correct
20 Correct 1667 ms 23896 KB Output is correct
21 Correct 1731 ms 23876 KB Output is correct
22 Correct 1750 ms 23860 KB Output is correct
23 Correct 2478 ms 24064 KB Output is correct
24 Correct 2523 ms 24048 KB Output is correct
25 Correct 2435 ms 24024 KB Output is correct
26 Correct 33 ms 2264 KB Output is correct
27 Correct 1557 ms 24044 KB Output is correct
28 Correct 1540 ms 23880 KB Output is correct
29 Correct 1429 ms 24288 KB Output is correct
30 Correct 1423 ms 23476 KB Output is correct
31 Correct 1310 ms 16304 KB Output is correct
32 Correct 1060 ms 5472 KB Output is correct
33 Correct 1537 ms 16464 KB Output is correct
34 Correct 1292 ms 16280 KB Output is correct
35 Correct 34 ms 2056 KB Output is correct
36 Correct 1465 ms 16412 KB Output is correct
37 Correct 1228 ms 16364 KB Output is correct
38 Correct 1089 ms 16392 KB Output is correct
39 Correct 847 ms 16728 KB Output is correct
40 Correct 780 ms 16476 KB Output is correct
41 Correct 901 ms 16056 KB Output is correct
42 Correct 784 ms 15948 KB Output is correct
43 Correct 1790 ms 24684 KB Output is correct
44 Correct 32 ms 2060 KB Output is correct
45 Correct 191 ms 2576 KB Output is correct
46 Correct 196 ms 2556 KB Output is correct
47 Correct 1555 ms 24796 KB Output is correct
48 Correct 1781 ms 24632 KB Output is correct
49 Correct 1511 ms 24852 KB Output is correct
50 Correct 870 ms 23848 KB Output is correct
51 Correct 868 ms 23752 KB Output is correct
52 Correct 872 ms 23968 KB Output is correct
53 Correct 1352 ms 24700 KB Output is correct
54 Correct 1334 ms 24724 KB Output is correct
55 Correct 1387 ms 24968 KB Output is correct
56 Correct 1419 ms 24740 KB Output is correct
57 Correct 1469 ms 24692 KB Output is correct
58 Correct 1807 ms 25080 KB Output is correct
59 Correct 1802 ms 24952 KB Output is correct
60 Correct 1810 ms 25320 KB Output is correct
61 Correct 1794 ms 25288 KB Output is correct
62 Correct 1505 ms 25064 KB Output is correct
63 Correct 1516 ms 25212 KB Output is correct
64 Correct 1737 ms 24744 KB Output is correct
65 Correct 1427 ms 22712 KB Output is correct
66 Correct 1684 ms 23684 KB Output is correct
67 Correct 1981 ms 23896 KB Output is correct
68 Correct 1672 ms 23704 KB Output is correct
69 Correct 1308 ms 23800 KB Output is correct
70 Correct 1896 ms 23760 KB Output is correct
71 Correct 1964 ms 23892 KB Output is correct
72 Correct 1954 ms 23896 KB Output is correct
73 Correct 1656 ms 23752 KB Output is correct
74 Correct 1668 ms 23820 KB Output is correct
75 Correct 1682 ms 23916 KB Output is correct
76 Correct 1339 ms 23652 KB Output is correct
77 Correct 1340 ms 23812 KB Output is correct
78 Correct 1344 ms 23848 KB Output is correct
79 Correct 1047 ms 24088 KB Output is correct
80 Correct 1039 ms 23916 KB Output is correct
81 Correct 1042 ms 23992 KB Output is correct
82 Correct 1037 ms 23560 KB Output is correct
83 Correct 1025 ms 23504 KB Output is correct
84 Correct 1022 ms 23556 KB Output is correct
85 Correct 2461 ms 24952 KB Output is correct
86 Correct 234 ms 2948 KB Output is correct
87 Correct 268 ms 3116 KB Output is correct
88 Correct 2091 ms 24920 KB Output is correct
89 Correct 2395 ms 24932 KB Output is correct
90 Correct 2171 ms 24844 KB Output is correct
91 Correct 1738 ms 23768 KB Output is correct
92 Correct 1723 ms 23920 KB Output is correct
93 Correct 2462 ms 23980 KB Output is correct
94 Correct 2083 ms 24880 KB Output is correct
95 Correct 2044 ms 24784 KB Output is correct
96 Correct 2380 ms 24884 KB Output is correct
97 Correct 1725 ms 24860 KB Output is correct
98 Correct 1763 ms 24504 KB Output is correct
99 Correct 2557 ms 25068 KB Output is correct
100 Correct 2648 ms 25104 KB Output is correct
101 Correct 2804 ms 25208 KB Output is correct
102 Correct 2687 ms 25240 KB Output is correct
103 Correct 2566 ms 24840 KB Output is correct
104 Correct 2594 ms 24900 KB Output is correct
105 Correct 1878 ms 24748 KB Output is correct
106 Correct 1538 ms 24660 KB Output is correct
107 Correct 1788 ms 25256 KB Output is correct
108 Correct 2438 ms 24500 KB Output is correct
109 Correct 2224 ms 22872 KB Output is correct