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1、最小生成树（minimumspanningtree）#includesstdio.h><#includesstring.h><#definemax9999999intmain(){intmap[101][101],i,j,x,y,z,n,m,k;intmin,len,f[101],mark[101],flags;while(scanf("%d%d&m&n),(m){memset(mark,0,sizeof(mark);for(i=1,the<=n;i++)for(j=1;j<=n;j++)map[][j]=max.for(i=1,the<=m;i++){scanf("%d
2、%d%d&x&y&z);if(z-map[x][y])(map[x][y]=map[y][x]=y;}}for(i=2;the<=n;i++)f[i]=map[1][];f(1)=0;len=0;for(i=1,the<=n;i++){min=max.for(j=1;j<=n;j++){if(!mark[j]&&f[j]map[k][j])f[j]=[k][j]map.}}flag=0;
3、for(i=1,the<=n;i++)if(f[i]=max(flag=1);break;}if(flag)printf("?");elseprintf("%d",len);}}#includesstdio.h><#includesstring.h><#definesize105#defineinit99.9999intcount;intgraph[size][size];longsum;voidprim(intvillige){inti,j;intmin,locate.intdist[size];sum=0;boolvisited[size];memset(vi
4、sited,0,sizeof(visited));memset(dist,init,sizeof(dist).for(i=1,the<=villige;i++)dist[i]=graph[1][];visited[i]=true;count=1;for(j=2,j<=villige;j++){min=init.for(i=2;the<=villige;i++){if(!visited[]&[i]5、<=villige;i++){if(!visited[]&[local][graph].=0&&dist[]>[local][graph])dist[i]=graph[locate][i].}}elsereturn;}}intmain(){introad,villige;inti,j;weight;while(scanf("%d%d"&road&villige).=-eof&road){count=0;for(i=0;i<=villige;i++){for(j=0,j<=villige;j++)if(i==2)graph[the][j]=0.elsegraph[the][
6、j]=init.}while(road){scanf("%d%d%d,&,&j.,&weight);graph[the][j]=weight;graph[j][i]=weight;}prim(villige);if(count==villige)printf(%ld",sum);elseprintf("?");}return0;}#includesstdio.h><#includesstdlib.h><#includesiostream>7、intgetfather(intv){if([v].=V）发[五]=getfather（FA[V]）；复发[V]；}整型CMP（常量空*，常量*）{结构（=）；结构（=）；如果（c）！=D-L）返回->->LLC；如果（C->X-D->x）返回C->X-D->X；否则返回C->y-d->Y；}国际judge_and_union（x，y）/判断两点是否已经到达！{intFX，FY，丫头，马克斯；FX（x）=getfather；FY=getfather（Y）；如果（外汇）返回0；疯丫头=外汇<风云？外汇：财政年度；马克斯=外汇<风
