oj.uz

Submission #917044

# Submission time Handle Problem Language Result Execution time Memory
917044 2024-01-27T04:29:33 Z firewater Election Campaign (JOI15_election_campaign) C++14
10 / 100
 106 ms 24668 KB 
#include<bits/stdc++.h>
#define fs first
#define sn second
#define mp make_pair
#define N 100100
#define ll long long
using namespace std;
ll n,m,ans,x,y,z,w,tot,h[N],f[N],sz[N],hs[N],top[N],fa[N],dep[N],dfn[N],low[N],v[N];
vector<pair<pair<ll,ll>,ll> >d[N];
struct rec
{
	ll to,nx;
}e[N<<1];
void addl(ll x,ll y)
{
	e[++tot].to=y;
	e[tot].nx=h[x];
	h[x]=tot;
	return;
}
struct Tree
{
	#define ls x*2
	#define rs x*2+1
	ll s[N<<2];
	void push_up(ll x)
	{
		s[x]=s[ls]+s[rs];
		return;
	}
	void change(ll x,ll l,ll r,ll y,ll z)
	{
		if(l==r){
			s[x]+=z;
			return;
		}
		ll mid=l+r>>1;
		if(y<=r)change(ls,l,mid,y,z);
		else change(rs,mid+1,r,y,z);
		push_up(x);
		return;
	}
	ll ask(ll x,ll L,ll R,ll l,ll r)
	{
		if(L==R)return s[x];
		ll mid=L+R>>1;
		if(mid<=r)return ask(ls,L,mid,l,r);
		else if(mid>l)return ask(rs,mid+1,R,l,r);
		else return ask(ls,L,mid,l,mid)+ask(rs,mid+1,R,mid+1,r);
	}
}T;
void dfs(ll x)
{
	sz[x]=1;
	for(ll i=h[x];i;i=e[i].nx){
		ll y=e[i].to;
		if(y==fa[x])continue;
		fa[y]=x;
		dep[y]=dep[x]+1;
		dfs(y);
		sz[x]+=sz[y];
		if(sz[y]>sz[hs[x]])hs[x]=y;
	}
	return;
}
void dfs1(ll x,ll anc)
{
	dfn[x]=++w;
	top[x]=anc;
	if(hs[x])dfs1(hs[x],anc);
	for(ll i=h[x];i;i=e[i].nx){
		ll y=e[i].to;
		if(y==fa[x]||y==hs[x])continue;
		dfs1(y,y);
	}
	low[x]=w;
	return;
}
ll lca(ll x,ll y)
{
	while(top[x]!=top[y]){
		if(dep[top[x]]<dep[top[y]])swap(x,y);
		x=fa[top[x]];
	}
	return (dep[x]<dep[y]?x:y);
}
ll ask(ll x,ll y)
{
	ll sum=0;
	while(top[x]!=top[y]){
		if(dep[top[x]]<dep[top[y]])swap(x,y);
		if(hs[x])sum+=f[hs[x]];
		sum+=T.ask(1,1,n,dfn[top[x]],dfn[x])-f[top[x]];
		x=fa[top[x]];
	}
	if(dep[x]>dep[y])swap(x,y);
	if(hs[y])sum+=f[hs[y]];
	sum+=T.ask(1,1,n,dfn[x],dfn[y]);
	return sum;
}
bool cmp(ll x,ll y)
{
	return dep[x]>dep[y];
}
int main()
{
	scanf("%lld",&n);
	for(ll i=1;i<n;++i){
		scanf("%lld%lld",&x,&y);
		addl(x,y);
		addl(y,x);
	}
	fa[1]=1;
	dep[1]=1;
	dfs(1);
	dfs1(1,1);
	scanf("%lld",&m);
	for(ll i=1;i<=m;++i){
		scanf("%lld%lld%lld",&x,&y,&z);
		ll u=lca(x,y);
		d[u].push_back(mp(mp(x,y),z));
	}
	for(ll i=1;i<=n;++i)
		v[i]=i;
	sort(v+1,v+1+n,cmp);
	for(ll i=1;i<=n;++i){
		x=v[i];
		f[x]=T.ask(1,1,n,dfn[x],dfn[x]);
		if(hs[x])f[x]+=f[hs[x]];
		for(ll j=0;j<d[x].size();++j){
			f[x]=max(f[x],ask(d[x][j].fs.fs,d[x][j].fs.sn)+d[x][j].sn);
//			printf("...........%d %d %d\n",d[x][j].fs.fs,d[x][j].fs.sn,ask(d[x][j].fs.fs,d[x][j].fs.sn));
		}
		ans=max(ans,f[x]);
//		printf("%d %d\n",x,f[x]);
		if(x!=1&&x==top[x])T.change(1,1,n,dfn[fa[x]],f[x]);
	}
	printf("%lld\n",ans);
	return 0;
}

Compilation message

election_campaign.cpp: In member function 'void Tree::change(long long int, long long int, long long int, long long int, long long int)':
election_campaign.cpp:37:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   37 |   ll mid=l+r>>1;
      |          ~^~
election_campaign.cpp: In member function 'long long int Tree::ask(long long int, long long int, long long int, long long int, long long int)':
election_campaign.cpp:46:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   46 |   ll mid=L+R>>1;
      |          ~^~
election_campaign.cpp: In function 'int main()':
election_campaign.cpp:130:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<std::pair<long long int, long long int>, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  130 |   for(ll j=0;j<d[x].size();++j){
      |              ~^~~~~~~~~~~~
election_campaign.cpp:107:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  107 |  scanf("%lld",&n);
      |  ~~~~~^~~~~~~~~~~
election_campaign.cpp:109:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  109 |   scanf("%lld%lld",&x,&y);
      |   ~~~~~^~~~~~~~~~~~~~~~~~
election_campaign.cpp:117:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  117 |  scanf("%lld",&m);
      |  ~~~~~^~~~~~~~~~~
election_campaign.cpp:119:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  119 |   scanf("%lld%lld%lld",&x,&y,&z);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12636 KB Output is correct
2 Correct 2 ms 12636 KB Output is correct
3 Correct 2 ms 12636 KB Output is correct
4 Incorrect 2 ms 12636 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12636 KB Output is correct
2 Correct 2 ms 12636 KB Output is correct
3 Correct 3 ms 12636 KB Output is correct
4 Correct 69 ms 24324 KB Output is correct
5 Correct 56 ms 24404 KB Output is correct
6 Correct 53 ms 24400 KB Output is correct
7 Correct 56 ms 24652 KB Output is correct
8 Correct 55 ms 24404 KB Output is correct
9 Correct 56 ms 24416 KB Output is correct
10 Correct 59 ms 24668 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12636 KB Output is correct
2 Correct 2 ms 12636 KB Output is correct
3 Correct 3 ms 12636 KB Output is correct
4 Correct 69 ms 24324 KB Output is correct
5 Correct 56 ms 24404 KB Output is correct
6 Correct 53 ms 24400 KB Output is correct
7 Correct 56 ms 24652 KB Output is correct
8 Correct 55 ms 24404 KB Output is correct
9 Correct 56 ms 24416 KB Output is correct
10 Correct 59 ms 24668 KB Output is correct
11 Correct 8 ms 13668 KB Output is correct
12 Correct 58 ms 24420 KB Output is correct
13 Correct 58 ms 24404 KB Output is correct
14 Correct 56 ms 24412 KB Output is correct
15 Correct 60 ms 24404 KB Output is correct
16 Correct 57 ms 24284 KB Output is correct
17 Correct 56 ms 24440 KB Output is correct
18 Correct 56 ms 24400 KB Output is correct
19 Correct 56 ms 24612 KB Output is correct
20 Correct 57 ms 24236 KB Output is correct

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 106 ms 17624 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12636 KB Output is correct
2 Correct 2 ms 12636 KB Output is correct
3 Correct 2 ms 12636 KB Output is correct
4 Incorrect 2 ms 12636 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #6
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12636 KB Output is correct
2 Correct 2 ms 12636 KB Output is correct
3 Correct 2 ms 12636 KB Output is correct
4 Incorrect 2 ms 12636 KB Output isn't correct
5 Halted 0 ms 0 KB -