Submission #921067

#	Time	Username	Problem	Language	Result	Execution time	Memory
921067		edogawa_something	Two Currencies (JOI23_currencies)	C++17	0 / 100	3 ms	8796 KiB

currencies

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<ll> vii;
typedef pair<ll,ll> pii;
#define F first
#define S second
#define pb push_back
#define all(v) v.begin(),v.end()
#define pow poww
const ll M=1e5+10;
const ll inf=2e18;
const ll mod=998244353;
const ll mmod=1e9+7;
const ll sz=(1<<18);
ll pow(ll x,ll y){
  ll res=1;
	if(y<0)
	return 1;
  x%=mod; 
  while(y>0){
    if((y&1))
    res*=x,res%=mod;
    x*=x,x%=mod;
    y=(y>>1);
  }
  return res;
}
ll n,m,q,tin[M],tout[M],sparse[M][20],val[M],root[M],vroot[M],curtime,t;
vii v[M];
map<ll,vii>vv;
pii edge[M];
struct pst{
  ll current_time=0;
}se;
void dfs(ll x=1){
  tin[x]=t++;
  for(auto it:v[x]){
    if(it==sparse[x][0])
    continue;
    sparse[it][0]=x;
    val[it]+=val[x];
    dfs(it);
  }
  tout[x]=t++;
}
void build(){
  dfs();
  for(int bit=1;bit<=18;bit++){
    for(int i=1;i<=n;i++)
    sparse[i][bit]=sparse[sparse[i][bit-1]][bit-1];
  }
}
ll least_common(ll x,ll y){
  if(tin[y]<tin[x]&&tout[y]>tout[x])
  return y;
  if(tin[x]<tin[y]&&tout[x]>tout[y])
  return x;
  for(int bit=18;bit>=0;bit--){
    if(tin[sparse[x][bit]]<tin[y]&&tout[sparse[x][bit]]>tout[y])
    continue;
    x=sparse[x][bit];
  }
  x=sparse[x][0];
  return x;
}
int main(){
  ios_base::sync_with_stdio(0),cin.tie(0);
  ll TC=1;
  //cin>>TC;
  while(TC--){
    cin>>n>>m>>q;
    for(int i=0;i<n-1;i++){
      ll x,y;
      cin>>x>>y;
      edge[i+1]={x,y};
      v[x].pb(y),v[y].pb(x);
    }
    ll vi=0;
    build();
    for(int i=0;i<m;i++){
      ll x,y;
      cin>>x>>y;
      pii p=edge[x];
      if(tin[p.F]<tin[p.S])
      val[p.S]++,vv[y].pb(p.S);
      else
      val[p.F]++,vv[y].pb(p.F);
      vi=y;
    }
    build();
    /*for(auto it:vv){
      for(auto itt:it.S){
        se.update(tin[itt],it.F);
        se.update(tout[itt],-it.F);
      }
      root[++curtime]=se.current_time;
      vroot[curtime]=it.F;
    }*/
    while(q--){
      ll l=0,r=curtime,mid;
      ll s,t,g,y;
      cin>>s>>t>>g>>y;
      ll lc=least_common(s,t);
      if(val[s]+val[t]-val[lc]*2==0){
        cout<<g<<'\n';
        continue;
      }/*
      while(l<=r){
        mid=((l+r)>>1);
        if(se.query(root[mid],s)+se.query(root[mid],t)-se.query(root[mid],lc)-se.query(root[mid],sparse[lc][0])<=y)
        l=mid+1;
        else
        r=mid-1;
      }
      if(l==0){
        g-=val[s]+val[t]-val[lc]-val[sparse[lc][0]]-y/vroot[0];
        if(g<0)
        g=-1;
        cout<<g<<'\n';
        continue;
      }
      ll x=se.qcnt(root[l-1],s)+se.qcnt(root[l-1],t)-se.qcnt(root[l-1],lc)-se.qcnt(root[l-1],sparse[lc][0]);
      y-=se.query(root[l-1],s)+se.query(root[l-1],t)-se.query(root[l-1],lc)-se.query(root[l-1],sparse[lc][0]);
      g-=val[x]+val[t]-val[lc]-val[sparse[lc][0]]-x-y/vroot[l];
      if(g<0)
      g=-1;*/
      g-=val[s]+val[t]-val[lc]*2;
      g+=min(val[s]+val[t]-val[lc]*2,y/vi);
      if(g<0)
      g=-1;
      cout<<g<<'\n';
    }
  }
  return 0;
}
/*

*/  

Compilation message (stderr)

currencies.cpp: In function 'int main()':
currencies.cpp:101:10: warning: unused variable 'l' [-Wunused-variable]
  101 |       ll l=0,r=curtime,mid;
      |          ^
currencies.cpp:101:14: warning: unused variable 'r' [-Wunused-variable]
  101 |       ll l=0,r=curtime,mid;
      |              ^
currencies.cpp:101:24: warning: unused variable 'mid' [-Wunused-variable]
  101 |       ll l=0,r=curtime,mid;
      |                        ^~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 28
• Subtask 3: 0 / 30
• Subtask 4: 0 / 32