【BZOJ 3545】【ONTAK 2010】Peaks & 【BZOJ 3551】【ONTAK 2010】Peaks加强版 Kruskal重构树
sunshine的A题我竟然调了一周!!!
把循环dfs改成一个dfs就可以,,,我也不知道为什么这样就不会RE,但它却是A了,,,
这周我一直在调这个题,总结一下智障错误:
1.倍增的范围设成了n而不是n*2-1,,,
2.重构树的顶点是n*2-1,而我一开始设成了n,,,
3.define里的for3和for4的i--打成i++,,,,,,,,,,,,
4.dfs爆栈了,找CA爷问的编译命令里手动扩栈,真是愚蠢的问题,,,,
比赛时绝不会有太多时间,在这么犯逗就得滚粗了QAQ
3545:
#include<cstdio> #include<cstring> #include<algorithm> #define for1(i,a,n) for(int i=(a);i<=(n);i++) #define for2(i,a,n) for(int i=(a);i<(n);i++) #define for3(i,a,n) for(int i=(a);i>=(n);i--) #define for4(i,a,n) for(int i=(a);i>(n);i--) #define CC(i,a) memset(i,a,sizeof(i)); #define read(x) x=getint() using namespace std; inline const int getint(){char c=getchar();int k=1,r=0;for(;c<'0'||c>'9';c=getchar())if(c=='-')k=-1;for(;c>='0'&&c<='9';c=getchar())r=r*10+c-'0';return k*r;} inline const int max(const int &a,const int &b){return a>b?a:b;} inline const int min(const int &a,const int &b){return a<b?a:b;} const int N=1E5+10; const int M=5*1E5+10; struct node{int x,y,z;}E[M]; struct snnn{int l,r,s;}T[N*30]; int n,m,fa[N<<1],num[N<<1],HH[N],id[N],H[N],cnt,f[N<<1][20]; int root[N],L[N<<1],R[N<<1],lch[N<<1],rch[N<<1],ST[N]; inline bool cmp(node X,node Y){return X.z<Y.z;} inline bool cmp2(int X,int Y){return HH[X]<HH[Y];} inline void init(){CC(fa,0);CC(num,0);CC(HH,0);CC(id,0);CC(H,0);CC(f,0);CC(root,0);CC(L,0);CC(R,0);CC(lch,0);CC(rch,0);CC(ST,0);} inline int find(int x){ if (x==fa[x]) return x; else{fa[x]=find(fa[x]);return fa[x];} } inline void LCA(int dd){ for1(j,1,19) for1(i,1,dd) f[i][j]=f[f[i][j-1]][j-1]; } inline void dfs(int x){ if (lch[x]&&rch[x]){ L[x]=cnt+1; dfs(lch[x]); dfs(rch[x]); R[x]=cnt; }else{ cnt++; ST[cnt]=x; L[x]=cnt; R[x]=cnt; } } inline void update(int l,int r,int &pos,int key){ T[++cnt]=T[pos]; pos=cnt; T[pos].s++; if (l==r) return; int mid=(l+r)>>1; if (key<=mid) update(l,mid,T[pos].l,key); else update(mid+1,r,T[pos].r,key); } inline int LCA_find(int x,int y){ for3(i,19,0) if ((f[x][i]!=0)&&(num[f[x][i]]<=y)) x=f[x][i]; return x; } inline int query(int LL,int RR,int key){ int mid,s,x=root[LL],y=root[RR],l=1,r=n; while (l<r){ mid=(l+r)>>1; s=T[T[y].l].s-T[T[x].l].s; if (key<=s) r=mid,x=T[x].l,y=T[y].l; else l=mid+1,key-=s,x=T[x].r,y=T[y].r; }return l; } int main(){ init(); read(n); read(m); int Q; read(Q); for1(i,1,n) read(HH[i]),id[i]=i; sort(id+1,id+n+1,cmp2); for1(i,1,n) H[id[i]]=i; for1(i,1,m){read(E[i].x);read(E[i].y);read(E[i].z);} sort(E+1,E+m+1,cmp); cnt=n+1; for2(i,1,n<<1) fa[i]=i; for1(i,1,m){ int fx=find(E[i].x),fy=find(E[i].y); if (fx!=fy){ fa[fx]=cnt; fa[fy]=cnt; f[fx][0]=cnt; f[fy][0]=cnt; lch[cnt]=fx; rch[cnt]=fy; num[cnt]=E[i].z; cnt++; if (cnt>((n<<1)-1)) break; } } int dd=cnt-1; LCA(dd); cnt=0; //for2(i,1,n<<1) if (L[i]==0) dfs(find(i)); dfs(dd); cnt=0; for1(i,1,n){ root[i]=root[i-1]; update(1,n,root[i],H[ST[i]]); } int a,b,c,la=0; for1(i,1,Q){ read(a); read(b); read(c); //a^=la; b^=la; c^=la; int rt=LCA_find(a,b),nn; if (R[rt]-L[rt]+1<c) nn=-1; else nn=HH[id[query(L[rt]-1,R[rt],R[rt]-L[rt]+2-c)]],la=nn; printf("%d\n",nn); } return 0; }
3551:
#include<cstdio> #include<cstring> #include<algorithm> #define for1(i,a,n) for(int i=(a);i<=(n);i++) #define for2(i,a,n) for(int i=(a);i<(n);i++) #define for3(i,a,n) for(int i=(a);i>=(n);i--) #define for4(i,a,n) for(int i=(a);i>(n);i--) #define CC(i,a) memset(i,a,sizeof(i)); #define read(x) x=getint() using namespace std; inline const int getint(){char c=getchar();int k=1,r=0;for(;c<'0'||c>'9';c=getchar())if(c=='-')k=-1;for(;c>='0'&&c<='9';c=getchar())r=r*10+c-'0';return k*r;} inline const int max(const int &a,const int &b){return a>b?a:b;} inline const int min(const int &a,const int &b){return a<b?a:b;} const int N=1E5+10; const int M=5*1E5+10; struct node{int x,y,z;}E[M]; struct snnn{int l,r,s;}T[N*30]; int n,m,fa[N<<1],num[N<<1],HH[N],id[N],H[N],cnt,f[N<<1][20]; int root[N],L[N<<1],R[N<<1],lch[N<<1],rch[N<<1],ST[N]; inline bool cmp(node X,node Y){return X.z<Y.z;} inline bool cmp2(int X,int Y){return HH[X]<HH[Y];} inline void init(){CC(fa,0);CC(num,0);CC(HH,0);CC(id,0);CC(H,0);CC(f,0);CC(root,0);CC(L,0);CC(R,0);CC(lch,0);CC(rch,0);CC(ST,0);} inline int find(int x){ if (x==fa[x]) return x; else{fa[x]=find(fa[x]);return fa[x];} } inline void LCA(int dd){ for1(j,1,19) for1(i,1,dd) f[i][j]=f[f[i][j-1]][j-1]; } inline void dfs(int x){ if (lch[x]&&rch[x]){ L[x]=cnt+1; dfs(lch[x]); dfs(rch[x]); R[x]=cnt; }else{ cnt++; ST[cnt]=x; L[x]=cnt; R[x]=cnt; } } inline void update(int l,int r,int &pos,int key){ T[++cnt]=T[pos]; pos=cnt; T[pos].s++; if (l==r) return; int mid=(l+r)>>1; if (key<=mid) update(l,mid,T[pos].l,key); else update(mid+1,r,T[pos].r,key); } inline int LCA_find(int x,int y){ for3(i,19,0) if ((f[x][i]!=0)&&(num[f[x][i]]<=y)) x=f[x][i]; return x; } inline int query(int LL,int RR,int key){ int mid,s,x=root[LL],y=root[RR],l=1,r=n; while (l<r){ mid=(l+r)>>1; s=T[T[y].l].s-T[T[x].l].s; if (key<=s) r=mid,x=T[x].l,y=T[y].l; else l=mid+1,key-=s,x=T[x].r,y=T[y].r; }return l; } int main(){ init(); read(n); read(m); int Q; read(Q); for1(i,1,n) read(HH[i]),id[i]=i; sort(id+1,id+n+1,cmp2); for1(i,1,n) H[id[i]]=i; for1(i,1,m){read(E[i].x);read(E[i].y);read(E[i].z);} sort(E+1,E+m+1,cmp); cnt=n+1; for2(i,1,n<<1) fa[i]=i; for1(i,1,m){ int fx=find(E[i].x),fy=find(E[i].y); if (fx!=fy){ fa[fx]=cnt; fa[fy]=cnt; f[fx][0]=cnt; f[fy][0]=cnt; lch[cnt]=fx; rch[cnt]=fy; num[cnt]=E[i].z; cnt++; if (cnt>((n<<1)-1)) break; } } int dd=cnt-1; LCA(dd); cnt=0; //for2(i,1,n<<1) if (L[i]==0) dfs(find(i)); dfs(dd); cnt=0; for1(i,1,n){ root[i]=root[i-1]; update(1,n,root[i],H[ST[i]]); } int a,b,c,la=0; for1(i,1,Q){ read(a); read(b); read(c); a^=la; b^=la; c^=la; int rt=LCA_find(a,b),nn; if (R[rt]-L[rt]+1<c) nn=-1,la=0; else nn=HH[id[query(L[rt]-1,R[rt],R[rt]-L[rt]+2-c)]],la=nn; printf("%d\n",nn); } return 0; }
然后就可以了O(∩_∩)O~~
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