标签:des style http color java os strong io
2 2 4 4 2 4 2 4 2 2 2 2 5 0 5 4 1 4 3 9 1 2 3 3
Not Unique Impossible Unique 1 2 3 3
//515MS 7304K #include<stdio.h> #include<string.h> #define M 1007 int s,t,n,m,k,sum1,sum2; int row[M],col[M],vis[M],g[M][M]; const int MAXN=20010;//点数的最大值 const int MAXM=880010;//边数的最大值 const int INF=0x3f3f3f3f; struct Node { int from,to,next; int cap; }edge[MAXM]; int tol; int head[MAXN]; int dis[MAXN]; int gap[MAXN];//gap[x]=y :说明残留网络中dis[i]==x的个数为y void init() { tol=0; memset(head,-1,sizeof(head)); } void addedge(int u,int v,int w) { edge[tol].from=u; edge[tol].to=v; edge[tol].cap=w; edge[tol].next=head[u]; head[u]=tol++; edge[tol].from=v; edge[tol].to=u; edge[tol].cap=0; edge[tol].next=head[v]; head[v]=tol++; } void BFS(int start,int end) { memset(dis,-1,sizeof(dis)); memset(gap,0,sizeof(gap)); gap[0]=1; int que[MAXN]; int front,rear; front=rear=0; dis[end]=0; que[rear++]=end; while(front!=rear) { int u=que[front++]; if(front==MAXN)front=0; for(int i=head[u];i!=-1;i=edge[i].next) { int v=edge[i].to; if(dis[v]!=-1)continue; que[rear++]=v; if(rear==MAXN)rear=0; dis[v]=dis[u]+1; ++gap[dis[v]]; } } } int SAP(int start,int end) { int res=0,nn=end+1; BFS(start,end); int cur[MAXN]; int S[MAXN]; int top=0; memcpy(cur,head,sizeof(head)); int u=start; int i; while(dis[start]<nn) { if(u==end) { int temp=INF; int inser; for(i=0;i<top;i++) if(temp>edge[S[i]].cap) { temp=edge[S[i]].cap; inser=i; } for(i=0;i<top;i++) { edge[S[i]].cap-=temp; edge[S[i]^1].cap+=temp; } res+=temp; top=inser; u=edge[S[top]].from; } if(u!=end&&gap[dis[u]-1]==0)//出现断层,无增广路 break; for(i=cur[u];i!=-1;i=edge[i].next) if(edge[i].cap!=0&&dis[u]==dis[edge[i].to]+1) break; if(i!=-1) { cur[u]=i; S[top++]=i; u=edge[i].to; } else { int min=nn; for(i=head[u];i!=-1;i=edge[i].next) { if(edge[i].cap==0)continue; if(min>dis[edge[i].to]) { min=dis[edge[i].to]; cur[u]=i; } } --gap[dis[u]]; dis[u]=min+1; ++gap[dis[u]]; if(u!=start)u=edge[S[--top]].from; } } return res; } void build() { sum1=0,sum2=0; for(int i=1;i<=n;i++) { scanf("%d",&row[i]); sum1+=row[i]; addedge(s,i,row[i]); } for(int i=1;i<=m;i++) { scanf("%d",&col[i]); sum2+=col[i]; addedge(n+i,t,col[i]); } for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) addedge(i,n+j,k); } bool iscycle(int u,int fa) { for(int i=head[u];i!=-1;i=edge[i].next) { if(i==(fa^1))continue; if(edge[i].cap) { if(vis[edge[i].to])return true; vis[edge[i].to]=true; if(iscycle(edge[i].to,i))return true; vis[edge[i].to]=false; } } return false; } void solve() { if(sum1!=sum2){printf("Impossible\n");return;} int anss=SAP(s,t); //printf("anss=%d\n",anss); if(anss!=sum1){printf("Impossible\n");return;} memset(vis,false,sizeof(vis)); int flag=0; for(int i=1;i<=n;i++)//判断残留网络是否存在环 if(iscycle(i,-1)) {flag=1;break;} if(flag)printf("Not Unique\n"); else { printf("Unique\n"); for(int u=1;u<=n;u++) for(int i=head[u];i!=-1;i=edge[i].next) { int v=edge[i].to; if(v>n&&v<=n+m) g[u][v-n]=k-edge[i].cap; } for(int i=1;i<=n;i++) { for(int j=1;j<m;j++) printf("%d ",g[i][j]); printf("%d\n",g[i][m]); } } } int main() { while(scanf("%d%d%d",&n,&m,&k)!=EOF) { s=0,t=n+m+1; init(); build(); solve(); } }
HDU Redraw Beautiful Drawings 判断最大流是否唯一解,布布扣,bubuko.com
HDU Redraw Beautiful Drawings 判断最大流是否唯一解
标签:des style http color java os strong io
原文地址:http://blog.csdn.net/crescent__moon/article/details/38321827