QOJ.ac

QOJ

ID题目提交者结果用时内存语言文件大小提交时间测评时间
#349098#6560. Broken Minimum Spanning Treerealcomplex0#WA 13ms3848kbC++201.8kb2024-03-09 23:36:572024-03-09 23:36:59

Judging History

你现在查看的是最新测评结果

  • [2024-03-09 23:36:59]
  • 评测
  • 测评结果:WA
  • 用时:13ms
  • 内存:3848kb
  • [2024-03-09 23:36:57]
  • 提交

answer

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

#define fi first
#define se second
#define mp make_pair
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);

struct edge{
    int uu;
    int vv;
    int ww;
    int id;
    bool operator< (const edge &ee) const {
        return ww < ee.ww;
    }
};

const int N = 2050;

int par[N];

int fin(int u){
    if(par[u] == u) return u;
    return par[u]=fin(par[u]);
}

bool unite(int u, int v){
    u=fin(u);
    v=fin(v);
    if(u==v)return false;
    par[u]=v;
    return true;
}

int n;
void init(){
    for(int i = 1; i <= n; i ++ ) par[i] = i;
}

int main(){
    fastIO;
    int m;
    cin >> n >> m;
    int u, v, w;
    vector<edge> ee;
    for(int i = 1; i <= m; i ++) {
        cin >> u >> v >> w;
        ee.push_back({u, v, w, i});
    }
    sort(ee.begin(), ee.end());
    int good = 0;
    vector<edge> cum;
    vector<int> ao, bo;
    for(int i = 0 ; i < ee.size(); i ++ ){
        cum.push_back(ee[i]);
        if(i + 1 == ee.size() || ee[i].ww != ee[i + 1].ww){
            init();
            for(int j = 0 ; j < i ; j ++ ){
                if(ee[j].ww < ee[i].ww){
                    unite(ee[j].uu, ee[j].vv);
                }
            }
            for(auto f : cum){
                if(f.id <= n - 1 && !unite(f.uu, f.vv)){
                    ao.push_back(f.id); // remove f.uu
                }
            }
            for(auto f : cum){
                if(f.id >= n && unite(f.uu, f.vv)){
                    bo.push_back(f.id);
                }
            }
            cum.clear();
        }
    }
    cout << ao.size() << "\n";
    for(int i = 0 ; i < ao.size(); i ++ ){
        cout << ao[i] << " " << bo[i] << "\n";
    }
    return 0;
}

詳細信息

Test #1:

score: 100
Accepted
time: 1ms
memory: 3848kb

input:

4 4
1 2 10
2 3 3
3 4 1
1 4 4

output:

1
1 4

result:

ok correct!

Test #2:

score: 0
Accepted
time: 1ms
memory: 3492kb

input:

6 8
1 2 10
2 3 10
3 4 10
4 5 10
5 6 10
6 1 10
1 3 1
4 6 1

output:

2
2 7
5 8

result:

ok correct!

Test #3:

score: 0
Accepted
time: 13ms
memory: 3684kb

input:

2000 1999
1262 1505 968661582
323 1681 787089412
1132 129 88786681
1909 587 762050278
979 1371 230688681
1686 521 980519364
975 191 887826021
869 461 899130441
1433 259 961154249
1718 547 721696188
1254 1042 458319755
1779 267 85751052
1170 813 283230029
309 20 971682908
224 417 255325364
1084 986 7...

output:

0

result:

ok correct!

Test #4:

score: 0
Accepted
time: 11ms
memory: 3680kb

input:

1999 1998
1757 1820 444157563
1757 395 754598547
1757 1571 432619009
1757 1009 456234067
1757 824 935569725
1757 1698 476714469
1757 1420 901765343
1757 1175 225295107
1757 1512 721959801
1757 1585 955067704
1757 1739 635181418
1757 1686 891225461
1757 84 132683224
1757 1696 48915557
1757 1623 42602...

output:

0

result:

ok correct!

Test #5:

score: 0
Accepted
time: 9ms
memory: 3632kb

input:

1999 1998
1345 647 232183406
40 837 279910457
819 857 137486924
255 1378 517489941
827 1565 894953662
1556 1545 898170464
965 877 72248541
1631 298 635713424
895 197 366305735
966 1160 515776809
1870 1638 220711661
1736 220 716014108
1914 1609 759121968
1293 153 272816132
1936 1433 263859075
985 460...

output:

0

result:

ok correct!

Test #6:

score: 0
Accepted
time: 1ms
memory: 3840kb

input:

500 998
105 1 1
105 2 1
105 3 1
105 4 1
105 5 1
105 6 1
105 7 1
105 8 1
105 9 1
105 10 1
105 11 1
105 12 1
105 13 1
105 14 1
105 15 1
105 16 1
105 17 1
105 18 1
105 19 1
105 20 1
105 21 1
105 22 1
105 23 1
105 24 1
105 25 1
105 26 1
105 27 1
105 28 1
105 29 1
105 30 1
105 31 1
105 32 1
105 33 1
105 ...

output:

0

result:

ok correct!

Test #7:

score: 0
Accepted
time: 1ms
memory: 3508kb

input:

500 998
364 1 1
364 2 1
364 3 1
364 4 1
364 5 1
364 6 1
364 7 1
364 8 1
364 9 1
364 10 1
364 11 1
364 12 1
364 13 1
364 14 1
364 15 1
364 16 1
364 17 1
364 18 1
364 19 1
364 20 1
364 21 1
364 22 1
364 23 1
364 24 1
364 25 1
364 26 1
364 27 1
364 28 1
364 29 1
364 30 1
364 31 1
364 32 1
364 33 1
364 ...

output:

0

result:

ok correct!

Test #8:

score: -100
Wrong Answer
time: 1ms
memory: 3808kb

input:

500 998
86 1 2
86 2 2
86 3 2
86 4 2
86 5 2
86 6 2
86 7 2
86 8 2
86 9 2
86 10 2
86 11 2
86 12 2
86 13 2
86 14 2
86 15 2
86 16 2
86 17 2
86 18 2
86 19 2
86 20 2
86 21 2
86 22 2
86 23 2
86 24 2
86 25 2
86 26 2
86 27 2
86 28 2
86 29 2
86 30 2
86 31 2
86 32 2
86 33 2
86 34 2
86 35 2
86 36 2
86 37 2
86 38...

output:

499
173 672
158 657
159 658
160 659
161 660
162 661
163 662
164 663
165 664
166 665
167 666
168 667
169 668
170 669
171 670
172 671
157 656
174 673
175 674
176 675
177 676
178 677
179 678
180 679
181 680
182 681
183 682
184 683
185 684
186 685
187 686
188 687
142 641
127 626
128 627
129 628
130 629
...

result:

wrong answer not a spanning tree after swap 1