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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#23465#3249. 分组作业QingyuAC ✓47ms9976kbC++142.1kb2022-03-16 14:22:082022-04-30 03:13:07

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2022-04-30 03:13:07]
  • 评测
  • 测评结果:AC
  • 用时:47ms
  • 内存:9976kb
  • [2022-03-16 14:22:08]
  • 提交

answer

#include<bits/stdc++.h>
#define int long long
using namespace std;
typedef long long ll;
const int INF=1ll<<45;
int n,m,k,s,t,vis[51000],dep[51000]; ll maxflow;
int edgenum=1,F[210000],V[210000],Next[210000],Head[51000],cur[51000];
void addedge(int u,int v,int f){
    V[++edgenum]=v; F[edgenum]=f;
    Next[edgenum]=Head[u];
    Head[u]=edgenum;
}
void Add(int u,int v,int f){
//	cerr<<"Edge: "<<u<<' '<<v<<' '<<f<<endl;
    addedge(u,v,f);
    addedge(v,u,0);
}
bool bfs(){
    for (int i=0;i<=t;i++) vis[i]=false,dep[i]=INF;
    dep[s]=0;
    vis[s]=true;
    queue<int> que;
    que.push(s);
    while (!que.empty()){
        int u=que.front(); que.pop();
        vis[u]=false;
        for (int e=Head[u];e;e=Next[e]){
            int v=V[e];
            if (dep[v]>dep[u]+1&&F[e]){
                dep[v]=dep[u]+1;
                if (!vis[v]){
                    que.push(v);
                    vis[v]=true;
                }
            }
        }
    }
    return dep[t]!=INF;
}
int dfs(int u,int flow){
    if (u==t){ 
        maxflow+=flow;
        return flow;
    }
    int used=0;
    for (int &e=cur[u];e;e=Next[e]){
        int v=V[e];
        if (F[e]&&dep[v]==dep[u]+1){
            int minflow=dfs(v,min(flow-used,F[e]));
            F[e]-=minflow; F[e^1]+=minflow; used+=minflow;
            if (used==flow) break;
        }
    }
    return used;
}
int dinic(){
    while (bfs()){
        for (int i=0;i<=t;i++) cur[i]=Head[i];
        while (dfs(s,INF));
    }
    return maxflow;
}
signed main(){
    ios::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
	cin>>n>>m; k=n+n; s=n+n+n; t=n+n+n+1;
	int c,d,e,sum=0;
	for (int i=0;i<k;i++){
		cin>>c>>d>>e;
//		c=rand(); d=rand(); e=rand();
		if (c>d) Add(s,i,c-d),sum+=d;
		else Add(i,t,d-c),sum+=c;
		Add(i^1,i,e); Add(i,(i>>1)+k,INF);
	}
	int x,y,a,b;
	for (int i=1;i<=m;i++){
		cin>>x>>y>>a>>b; x--; y--;
//		x=rand()%n; y=rand()%n;
//		while (x==y||(x^y)==1) y=rand();
		
//		a=rand(); b=rand();
		Add((x>>1)+k,y,a); Add(x,(y>>1)+k,b);
	}
	cout<<sum+dinic()<<endl;
	return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 40ms
memory: 8348kb

input:

5000 10000
23060775 12 2
255978380 28 517
5 6624 26
151149 45131806 23849036
489 484971 24970
162846 1993316 188305
56311199 2003 211
1 50534913 517527
364913 882765 298
71 26 122914059
13 65459 18150033
20 607 8
380059068 3873712 228
9813 5449 6370
3309369 37410691 8
181 1 62340851
1705 4 107
8 209...

output:

22929674417

result:

ok single line: '22929674417'

Test #2:

score: 0
Accepted
time: 43ms
memory: 8864kb

input:

5000 10000
10055 16 122
4784525 16 23548777
75 3 412576
26487664 16119952 1092
3168 28 16059
33 4 13
2 1319671 7150391
17548 31559813 3201
6910 499901569 2
86633 8794940 2
4 2 85
1749 9908314 45526
10 631569 2347
18 141185 145333
23 27 117121
3825480 32645 5236
3 32022 1298
8 51750221 233
4 16102047...

output:

21306827991

result:

ok single line: '21306827991'

Test #3:

score: 0
Accepted
time: 40ms
memory: 8872kb

input:

5000 10000
48362 83079 12461784
16 4689773 2
763 3650 1128
2118 75447925 253189
47745409 622140 70841
302 162849091 1258
3399198 91 808632
16168406 10380 2
370511 10 3193109
261594 4 2
128 106331221 2
605 28343 601
19 1224480 37551173
49 78375152 493909
110536 1 836
28790 8 133
8 40 4
533035 879 391...

output:

22066314160

result:

ok single line: '22066314160'

Test #4:

score: 0
Accepted
time: 47ms
memory: 8736kb

input:

5000 10000
5564 607330 2584640
126520704 169669 3
231555 402303 114
2 128 58
290016 13 74249
8126414 279 974
1304 119651095 35466664
992290 3414 63
23564 1091 18168
418 125135735 3
29 1295683 424396930
1993 12647005 20
7 712237 1086773
500004515 6 355786
383393 486213 73
21141 29726 665
1 59959 2020...

output:

22438919820

result:

ok single line: '22438919820'

Test #5:

score: 0
Accepted
time: 40ms
memory: 9140kb

input:

5000 10000
23 1 217
41 249931 61567
3096055 3 7
24 12529 1
246322439 144141318 223606
39 906 2
22654307 3963932 3447414
7949665 51935780 344666
30 5058423 2825
148134 7532713 1140
242 5560395 4264
62940 8262918 182
7825 9865191 2992
138038614 24828018 33318812
11 1 4741355
241 533 3
4337359 741573 3...

output:

21645286114

result:

ok single line: '21645286114'

Test #6:

score: 0
Accepted
time: 45ms
memory: 9976kb

input:

5000 10000
53751618 18 124436
857 472 16
13506752 72 6929805
1313173 1 8
13 3 9428917
114702 15875684 375277
95772377 1 19
46 146 544774
2606 90182736 313
2 26253 330
92 17290550 229451029
53 3175 2
48316557 38441802 31
52027 40844521 966
2 455 40909310
6556 6662246 17592087
4914675 39 11812
4590536...

output:

24730200863

result:

ok single line: '24730200863'

Test #7:

score: 0
Accepted
time: 32ms
memory: 8312kb

input:

5000 10000
529152667 2028658 288974
46 2 1853274
212853 4442959 1
7439830 113977860 15476191
87430 6 972573
112375 4489 485
1273959 4049 4059
21 39694709 5
15511 256587916 2
164834468 4 95557537
9330 3 31231
1880144 197069 5753237
102274889 2187511 108044
1906 76869460 12
30311 27016904 6492296
1645...

output:

21376330041

result:

ok single line: '21376330041'

Test #8:

score: 0
Accepted
time: 0ms
memory: 9816kb

input:

3 2
1 1 999
1 1 999
1 999 999
1 999 999
999 1 999
999 1 999
5 1 999 1
1 3 100 1

output:

106

result:

ok single line: '106'