Submission #889493

#	Time	Username	Problem	Language	Result	Execution time	Memory
889493		alexander707070	Two Currencies (JOI23_currencies)	C++14	0 / 100	2 ms	14684 KiB

currencies

#include<bits/stdc++.h>
#define MAXN 100007
using namespace std;

struct edge{
    int ind,cost;
};

struct query{
    int s,t,x,y,l,r;
};

int n,m,q,tt,dist[MAXN],costs[MAXN],ans[MAXN];
int a[MAXN],b[MAXN],fr[MAXN];
int from[MAXN],to[MAXN],ret[MAXN];

vector<int> euler,w[MAXN];
vector< pair<int,int> > v[MAXN];
edge e[MAXN];
query qs[MAXN];

bool cmp(edge fr,edge sc){
    return fr.cost<sc.cost;
}

int dp[4*MAXN][20];
bool u[4*MAXN][20];

int lg[4*MAXN],power[20];

void calc(){
    power[0]=1;
    for(int i=1;i<20;i++)power[i]=power[i-1]*2;
    lg[1]=0;
    for(int i=2;i<=4*n;i++)lg[i]=lg[i/2]+1;
}

int rmq(int i,int j){
    if(j==0)return euler[i];
    
    if(u[i][j])return dp[i][j];
    u[i][j]=true;

    dp[i][j]=min( rmq(i,j-1) , rmq(i+power[j-1],j-1) );
    return dp[i][j];
}

int getmin(int l,int r){
    int len=r-l+1;
    return min( rmq(l,lg[len]) , rmq(r-power[lg[len]]+1,lg[len]) );
}

int lca(int x,int y){
    if(fr[x]>fr[y])swap(x,y);
    return ret[ getmin(fr[x],fr[y]) ];
}

long long tree[4*MAXN];

void update(int v,int l,int r,int ll,int rr,long long val){
    if(ll>rr)return;
    if(l==ll and r==rr){
        tree[v]+=val;
    }else{
        int tt=(l+r)/2;
        update(2*v,l,tt,ll,min(tt,rr),val);
        update(2*v+1,tt+1,r,max(tt+1,ll),rr,val);
    }
}

long long getval(int v,int l,int r,int pos){
    if(l==r)return tree[v];

    int tt=(l+r)/2;
    if(pos<=tt)return getval(2*v,l,tt,pos)+tree[v];
    else return getval(2*v+1,tt+1,r,pos)+tree[v];
}

long long getdist(int x,int y){
    return getval(1,1,n,from[x]) + getval(1,1,n,from[y]) - getval(1,1,n,from[lca(x,y)]);
}

void dfs(int x,int p,int dd){
    tt++; from[x]=tt; ret[tt]=x;
    fr[x]=int(euler.size());
    euler.push_back(x);
    dist[x]=dd;

    for(int i=0;i<v[x].size();i++){
        if(v[x][i].first==p)continue;
        dfs(v[x][i].first,x,dd+costs[v[x][i].second]);
        euler.push_back(x);
    }

    to[x]=tt;
}

void parallel_binary(){

    for(int i=0;i<=m;i++)w[i].clear();

    for(int i=1;i<=q;i++){
        if(qs[i].l+1<qs[i].r){
            w[(qs[i].l+qs[i].r)/2].push_back(i);
        }
    }

    for(int i=1;i<=4*n;i++)tree[i]=0;

    for(int i=0;i<=m;i++){
        if(i>0)update(1,1,n,from[b[e[i].ind]],to[b[e[i].ind]],e[i].cost);

        for(int f:w[i]){
            if(getdist(qs[f].s,qs[f].t)<=qs[f].y){
                qs[f].l=(qs[f].l+qs[f].r)/2;
            }else{
                qs[f].r=(qs[f].l+qs[f].r)/2;
            }
        }
    }
}

void find_sol(){
    for(int i=0;i<=m;i++)w[i].clear();

    for(int i=1;i<=q;i++){
        w[qs[i].l].push_back(i);
    }

    for(int i=1;i<=4*n;i++)tree[i]=0;

    for(int i=0;i<=m;i++){
        if(i>0)update(1,1,n,from[b[e[i].ind]],to[b[e[i].ind]],1);

        for(int f:w[i]){
            ans[f]=dist[qs[f].s]+dist[qs[f].t]-dist[lca(qs[f].s,qs[f].t)] - getdist(qs[f].s,qs[f].t);
        }
    }
}

int main(){

    cin>>n>>m>>q;
    calc();

    for(int i=1;i<=n-1;i++){
        cin>>a[i]>>b[i];
        v[a[i]].push_back({b[i],i});
        v[b[i]].push_back({a[i],i});
    }

    for(int i=1;i<=n-1;i++){
        if(from[a[i]]>from[b[i]])swap(a[i],b[i]);
    }

    for(int i=1;i<=m;i++){
        cin>>e[i].ind>>e[i].cost;
        costs[e[i].ind]++;
    }

    sort(e+1,e+m+1,cmp);

    dfs(1,0,0);

    for(int i=1;i<=q;i++){
        cin>>qs[i].s>>qs[i].t>>qs[i].x>>qs[i].y;
        qs[i].l=0;
        qs[i].r=m+1;
    }

    for(int i=1;i<=17;i++){
        parallel_binary();
    }

    find_sol();

    for(int i=1;i<=q;i++){
        ans[i]=qs[i].x-ans[i];
        if(ans[i]<0)cout<<"-1\n";
        else cout<<ans[i]<<"\n";
    }

    return 0;
}

Compilation message (stderr)

currencies.cpp: In function 'void dfs(int, int, int)':
currencies.cpp:89:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~

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