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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 |
---|---|---|---|---|---|---|---|---|---|
#114037 | #6350. MIT | Crysfly | TL | 1679ms | 33592kb | C++17 | 3.1kb | 2023-06-20 17:44:32 | 2023-06-20 17:44:33 |
Judging History
answer
// what is matter? never mind.
#include<bits/stdc++.h>
#define For(i,a,b) for(int i=(a);i<=(b);++i)
#define Rep(i,a,b) for(int i=(a);i>=(b);--i)
#define int long long
using namespace std;
inline int read()
{
char c=getchar();int x=0;bool f=0;
for(;!isdigit(c);c=getchar())f^=!(c^45);
for(;isdigit(c);c=getchar())x=(x<<1)+(x<<3)+(c^48);
if(f)x=-x;return x;
}
#define fi first
#define se second
#define pb push_back
#define mkp make_pair
typedef pair<int,int>pii;
typedef vector<int>vi;
#define maxn 100005
#define inf 0x3f3f3f3f
int n,m;
vector<pii>e[maxn];
int fa[maxn],dep[maxn],sz[maxn];
int dfn[maxn],que[maxn],out[maxn],dis[maxn],idx;
int st[20][maxn],lg[maxn];
int depmin(int u,int v){return dep[u]<dep[v]?u:v;}
void dfs(int u){
dfn[u]=++idx,que[idx]=u,sz[u]=1;
for(auto it:e[u]){
int v=it.fi,w=it.se;
if(v==fa[u])continue;
fa[v]=u,dep[v]=dep[u]+1,dis[v]=dis[u]+w;
dfs(v),sz[u]+=sz[v];
}out[u]=idx;
}
void init(){
dfs(1);
For(i,2,n)st[0][i]=fa[que[i]],lg[i]=lg[i>>1]+1;
For(j,1,19)
For(i,1,n-(1<<j)+1)
st[j][i]=depmin(st[j-1][i],st[j-1][i+(1<<(j-1))]);
}
int lca(int u,int v){
if(u==v)return u;
if((u=dfn[u])>(v=dfn[v]))swap(u,v); ++u;
int k=lg[v-u+1];
return depmin(st[k][u],st[k][v-(1<<k)+1]);
}
int dist(int u,int v){
if(!u||!v)return -((!u)+(!v));
return dis[u]+dis[v]-2*dis[lca(u,v)];
}
struct diam{
int u,v,d;
diam(int x=0,int y=0){u=x,v=y,d=dist(x,y);}
bool operator <(const diam&b)const{return d<b.d;}
void ins(int x){
if(!x)return;
int du=dist(u,x),dv=dist(v,x);
if(du<dv)swap(u,v),swap(du,dv);
if(du>d)v=x,d=du;
}
void operator +=(diam b){ins(b.u),ins(b.v);}
friend diam operator +(diam a,diam b){a+=b;return a;}
friend diam operator *(diam a,diam b){return max(max(diam(a.u,b.u),diam(a.v,b.v)),max(diam(a.u,b.v),diam(a.v,b.u)));}
};
diam tr[maxn<<2];
int leaf[maxn];
void up(int p){tr[p]=tr[p<<1]+tr[p<<1|1];}
void build(int p,int l,int r){
if(l==r)return tr[p]=diam(l,l),leaf[l]=p,void();
int mid=l+r>>1;
build(p<<1,l,mid),build(p<<1|1,mid+1,r),up(p);
}
void upd(int x){
int p=leaf[x];
tr[p]=diam(0,0);
while(p>>=1)up(p);
}
bool vis[maxn];
int res;
int rt,siz[maxn],mxp[maxn],allsz;
void getrt(int u,int pa){
siz[u]=vis[u],mxp[u]=0;
for(auto it:e[u]){
int v=it.fi,w=it.se;
if(v==pa)continue;
getrt(v,u),siz[u]+=siz[v],mxp[u]=max(mxp[u],siz[v]);
}
mxp[u]=max(mxp[u],allsz-siz[u]);
if(mxp[u]<=mxp[rt])rt=u;
}
signed main()
{
n=read();
For(i,2,n){
int u=read(),v=read(),w=read();
e[u].pb(mkp(v,w)),e[v].pb(mkp(u,w));
}
init();
build(1,1,n);
int x=tr[1].u,y=tr[1].v;
vis[x]=vis[y]=1,res=dist(x,y),mxp[0]=n+1;
upd(x),upd(y);
// cout<<"x,y "<<x<<" "<<y<<endl;
cout<<res<<" ";
rt=x;
For(i,3,n){
x=tr[1].u,y=tr[1].v;
// cout<<"i: "<<i<<" "<<rt<<endl;
int dx=dist(x,rt),dy=dist(y,rt);
if(dx<dy)swap(dx,dy),swap(x,y);
vis[x]=1,upd(x);
// cout<<"x: "<<x<<endl;
res+=dx;
int rrt=rt;
if(i%2!=0){
rt=0,allsz=i,getrt(1,0);
res-=dist(rt,rrt);
}
// cout<<"RT "<<rrt<<" "<<rt<<endl;
if(i%2==0) cout<<res<<" ";
}
return 0;
}
詳細信息
Test #1:
score: 100
Accepted
time: 0ms
memory: 24928kb
input:
7 1 3 99 2 3 82 3 4 4 4 5 43 5 6 5 4 7 3
output:
181 280 287
result:
ok 3 number(s): "181 280 287"
Test #2:
score: 0
Accepted
time: 11ms
memory: 31368kb
input:
1000 328 12 58771429 881 504 17030494 847 622 20805817 12 922 58532669 879 929 52585738 495 726 27873950 855 17 37971674 797 941 76999719 702 610 719916 479 127 97829887 731 557 55300256 282 615 88802280 651 318 64099880 540 51 6547869 896 54 87823596 674 879 80674008 77 691 54802376 193 851 7869172...
output:
48829042195 97562386542 146216474947 194713456438 243120633399 291394542517 339657517459 387785045812 435787622310 483691355869 531476208289 579153483709 626793764008 674259794140 721617453738 768862531418 816032104456 863044440224 909960999950 956790589086 1003491332151 1050093110804 1096582356539 ...
result:
ok 500 numbers
Test #3:
score: 0
Accepted
time: 6ms
memory: 30396kb
input:
1000 739 878 29520635 133 940 5021186 160 908 26446479 441 122 80604853 539 396 95959331 635 860 46393560 387 172 58313059 53 442 65841670 121 159 59547874 35 264 28494605 269 78 29571243 436 384 89754669 619 47 52195144 57 336 95094232 936 419 88183176 877 634 14912042 47 100 57449297 533 101 61185...
output:
1335958866 2626054407 3904456915 5174845834 6437211717 7689455676 8928545787 10163335876 11395869036 12622043944 13839303826 15049898576 16256276325 17459646468 18659090162 19856778178 21048658276 22239285858 23421421030 24597109238 25772007715 26944410577 28111355238 29275440829 30439025973 3160110...
result:
ok 500 numbers
Test #4:
score: 0
Accepted
time: 1679ms
memory: 32384kb
input:
10000 8832 9937 83287693 1229 3010 26805846 5184 8703 32371496 5692 201 90600077 7857 7922 2427036 6991 1815 55936149 9126 8434 96181780 2395 5238 99604883 3721 3882 32707216 6961 5616 4158592 479 2786 52279400 9395 164 84498120 9470 462 16429465 8303 9717 36203661 4462 3119 77535638 9010 5633 83602...
output:
501483023048 1002862634577 1504180026111 2005449794525 2506536411562 3007537456615 3508449380203 4009328554633 4510105447462 5010869687212 5511538034705 6012089525686 6512463969594 7012812594398 7513027036015 8013205824561 8513282014876 9013342841924 9513374638228 10013328423574 10513136286282 11012...
result:
ok 5000 numbers
Test #5:
score: 0
Accepted
time: 510ms
memory: 33592kb
input:
10000 4492 5687 48649564 2101 358 76113540 8890 681 20477601 5658 2715 20252482 1495 646 86758431 3635 3432 68949767 4697 4340 46098280 63 5675 93748955 5761 7076 22517422 3184 9956 51745781 5532 8952 73420533 1284 4986 3427090 6181 8228 67376021 3115 7851 49040922 5609 4274 73495454 3082 7140 33903...
output:
1819011399 3610283149 5389719917 7165165127 8935910477 10688388373 12428866897 14143649215 15852590144 17553165073 19249717624 20945981402 22640112945 24322221048 26001998205 27679479690 29351460121 31019617475 32687276454 34352073284 36015148263 37676360382 39336662739 40988468898 42638462940 44286...
result:
ok 5000 numbers
Test #6:
score: -100
Time Limit Exceeded
input:
100000 24880 31580 94970384 94020 94021 53992679 93018 20941 73715500 35013 68974 24682681 84533 55066 72610856 9580 43559 96196239 80047 56875 25109065 83499 20829 59808314 97995 41133 22740692 23426 74367 65415289 57511 75315 31164442 36922 42744 52608303 83057 76938 87278645 55747 45197 84000571 ...
output:
5010397956787 10020641445288 15030757289053 20040692351879 25050527457825 30060240975402 35069836607862 40079333710046 45088716306382 50098029965855 55107309142733 60116488016667 65125537215058 70134572054336 75143498785869 80152300239578 85160932266852 90169508996796 95177987864419 100186333199356 ...