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답안 #126435

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
126435 2019-07-07T18:13:26 Z TadijaSebez Designated Cities (JOI19_designated_cities) C++11
7 / 100
 474 ms 50040 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
const int N=200050;
vector<pair<int,int>> E[N];
ll sum[N],all_up;
int up[N],down[N];
void DFS(int u, int p)
{
	for(auto e:E[u])
	{
		int v=e.first,w=e.second;
		if(v==p) up[u]=w,all_up+=w;
	}
	if(p) sum[u]=sum[p]+down[u]-up[u];
	for(auto e:E[u])
	{
		int v=e.first,w=e.second;
		if(v!=p)
		{
			down[v]=w;
			DFS(v,u);
		}
	}
}
ll dep[N];
int lid[N],rid[N],tid,nod[N],par[N],my[N],rt,n;
void DFS2(int u, int p)
{
	lid[u]=++tid;
	nod[tid]=u;
	par[u]=p;
	my[u]=u;
	for(auto e:E[u]) if(e.first!=p)
	{
		int v=e.first;
		dep[v]=dep[u]+e.second;
		DFS2(v,u);
		if(dep[my[u]]<dep[my[v]]) my[u]=my[v];
	}
	rid[u]=tid;
}
const int M=2*N;
int ls[M],rs[M],tsz,root,id[M];
ll mn[M],lzy[M];
void Build(int &c, int ss, int se)
{
	c=++tsz;
	if(ss==se){ mn[c]=dep[nod[ss]];id[c]=nod[ss];return;}
	int mid=ss+se>>1;
	Build(ls[c],ss,mid);
	Build(rs[c],mid+1,se);
	mn[c]=min(mn[ls[c]],mn[rs[c]]);
	if(mn[c]==mn[ls[c]]) id[c]=id[ls[c]];
	else id[c]=id[rs[c]];
}
void Add(int c, int ss, int se, int qs, int qe, ll x)
{
	if(qs>qe || qs>se || ss>qe) return;
	if(qs<=ss && qe>=se){ mn[c]+=x;lzy[c]+=x;return;}
	int mid=ss+se>>1;
	Add(ls[c],ss,mid,qs,qe,x);
	Add(rs[c],mid+1,se,qs,qe,x);
	mn[c]=min(mn[ls[c]],mn[rs[c]]);
	if(mn[c]==mn[ls[c]]) id[c]=id[ls[c]];
	else id[c]=id[rs[c]];
	mn[c]+=lzy[c];
}
bool was[N];
ll ans[N],cur;
void Add(int x)
{
	for(;x!=rt;x=par[x])
	{
		if(was[x]) break;
		was[x]=1;
		Add(root,1,n,lid[x],rid[x],-dep[x]+dep[par[x]]);
		cur+=dep[x]-dep[par[x]];
	}
}
int main()
{
	int q,u,v,c,d;
	scanf("%i",&n);
	ll z=0;
	for(int i=1;i<n;i++)
	{
		scanf("%i %i %i %i",&u,&v,&c,&d);
		E[u].pb({v,c});
		E[v].pb({u,d});
		z+=c+d;
	}
	DFS(1,0);
	rt=1;
	for(int i=1;i<=n;i++)
	{
		sum[i]+=all_up;
		if(sum[i]>sum[rt]) rt=i;
	}
	DFS2(rt,0);
	ans[1]=cur=sum[rt];
    Build(root,1,n);
    int fir=0,sec=0;
    for(auto e:E[rt])
	{
		v=e.first;
		if(dep[my[v]]>dep[fir]) sec=fir,fir=my[v];
		else if(dep[my[v]]>dep[sec]) sec=my[v];
	}
	Add(fir);
	if(sec) Add(sec);
	ans[2]=cur;
	for(int i=3;i<=n;i++)
	{
		Add(id[root]);
		ans[i]=cur;
	}
	scanf("%i",&q);
	while(q--)
	{
		int x;
		scanf("%i",&x);
		printf("%lld\n",z-ans[x]);
	}
	return 0;
}

Compilation message

designated_cities.cpp: In function 'void Build(int&, int, int)':
designated_cities.cpp:51:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=ss+se>>1;
          ~~^~~
designated_cities.cpp: In function 'void Add(int, int, int, int, int, long long int)':
designated_cities.cpp:62:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=ss+se>>1;
          ~~^~~
designated_cities.cpp: In function 'int main()':
designated_cities.cpp:85:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i",&n);
  ~~~~~^~~~~~~~~
designated_cities.cpp:89:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%i %i %i %i",&u,&v,&c,&d);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
designated_cities.cpp:119:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i",&q);
  ~~~~~^~~~~~~~~
designated_cities.cpp:123:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%i",&x);
   ~~~~~^~~~~~~~~

Subtask #1
0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 5112 KB Output is correct
2 Incorrect 6 ms 5112 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 5112 KB Output is correct
2 Correct 310 ms 37504 KB Output is correct
3 Correct 451 ms 46636 KB Output is correct
4 Correct 289 ms 35436 KB Output is correct
5 Correct 303 ms 36848 KB Output is correct
6 Correct 329 ms 39928 KB Output is correct
7 Correct 257 ms 36972 KB Output is correct
8 Correct 474 ms 50040 KB Output is correct
9 Correct 212 ms 37452 KB Output is correct

Subtask #3
0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 5112 KB Output is correct
2 Incorrect 335 ms 37420 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 5112 KB Output is correct
2 Incorrect 6 ms 5112 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 5112 KB Output is correct
2 Correct 310 ms 37504 KB Output is correct
3 Correct 451 ms 46636 KB Output is correct
4 Correct 289 ms 35436 KB Output is correct
5 Correct 303 ms 36848 KB Output is correct
6 Correct 329 ms 39928 KB Output is correct
7 Correct 257 ms 36972 KB Output is correct
8 Correct 474 ms 50040 KB Output is correct
9 Correct 212 ms 37452 KB Output is correct
10 Correct 6 ms 5112 KB Output is correct
11 Incorrect 335 ms 37420 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #6
0 / 44.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 5112 KB Output is correct
2 Incorrect 6 ms 5112 KB Output isn't correct
3 Halted 0 ms 0 KB -