Submission #964472

#	Time	Username	Problem	Language	Result	Execution time	Memory
964472		YassirSalama	Two Currencies (JOI23_currencies)	C++17	40 / 100	5031 ms	106168 KiB

currencies

#include <bits/stdc++.h>
using namespace std;
const int dx[4] = {1,0,-1,0}, dy[4] = {0,1,0,-1};
#define endl "\n"
#define int ll
using ull=unsigned long long;
using ll=long long;
using pii=pair<int,int>;
const int mod=1e9+7;
#define OVL(x,s) for(auto y:x) cout<<y<<s; cout<<"\n";
template <typename T> istream& operator>>(istream& is, vector<T> &a) {
    copy_n(istream_iterator<T>(is), a.size(), a.begin()); return is;}
#ifdef IOI
void dbg_out() { cout << endl; } template<typename Head, typename... Tail> void dbg_out(Head H, Tail... T) { cout << ' ' << H; dbg_out(T...); }
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__);
#else
#define dbg(...) 1337;
#endif
#define pb push_back
#define F first
#define S second
#define all(v) v.begin(),v.end()
const int mxn=1e5+100;
const int LOGN=20;
vector<pair<int,int>> ed;
vector<vector<int>> f;
vector<int> v[mxn];
int depth[mxn];
int pos[mxn];
int top[mxn];
int sz[mxn];
int up[mxn][LOGN+1];
map<pii,int> mp;
map<int,pii> mp2;
vector<vector<int>> queries;
void dfs(int node,int par){
    depth[node]=depth[par]+1;
    up[node][0]=par;
    for(int i=1;i<=LOGN;i++){
        up[node][i]=up[up[node][i-1]][i-1];
    }
    sz[node]=1;
    for(auto x:v[node]){
        if(x==par){continue;}
        dfs(x,node);
        sz[node]+=sz[x];
    }
}
int LCA(int a,int b){
    if(depth[a]<depth[b]) swap(a,b);
    int d=depth[a]-depth[b];
    for(int i=LOGN;i>=0;i--){
        if(d&(1<<i)) a=up[a][i];
    }
    if(a==b) return a;
    for(int i=LOGN;i>=0;i--){
        if(up[a][i]!=up[b][i]){
            a=up[a][i];
            b=up[b][i];
        }
    }
    return up[a][0];
}
int c=1;
int cID=1;
void HLD(int node,int par,int cID){
    top[node]=cID;
    pos[node]=c;
    c++;
    int bst=0;
    int b=-1;
    for(auto x:v[node]){
        if(x==par) continue;
        if(b<sz[x]){
            b=sz[x];
            bst=x;
        }
    }
    if(b!=-1){
        HLD(bst,node,cID);
    }
    for(auto x:v[node]){
        if(x==par||x==bst) continue;
        HLD(x,node,x);
    }
}
int tree[4*mxn][2];
void update(int node,int l,int r,int ql,int x){
    if(l==r){
        tree[node][0]+=x;
        tree[node][1]+=(x>0?1:-1);
        return;
    }
    int mid=(l+r)/2;
    if(ql<=mid) update(node<<1,l,mid,ql,x);
    else update(node<<1|1,mid+1,r,ql,x);
    tree[node][0]=tree[node<<1][0]+tree[node<<1|1][0];
    tree[node][1]=tree[node<<1][1]+tree[node<<1|1][1];
}
int query(int node,int l,int r,int ql,int qr){
    if(ql>qr) return 0;
    if(ql<=l&&r<=qr) return tree[node][0];
    int ans=0;
    int mid=(l+r)/2;
    if(ql<=mid) ans+=query(node<<1,l,mid,ql,qr);
    if(qr>mid) ans+=query(node<<1|1,mid+1,r,ql,qr);
    return ans;
}
int query1(int node,int l,int r,int ql,int qr){
    if(ql>qr) return 0;
    if(ql<=l&&r<=qr) return tree[node][1];
    int ans=0;
    int mid=(l+r)/2;
    if(ql<=mid) ans+=query1(node<<1,l,mid,ql,qr);
    if(qr>mid) ans+=query1(node<<1|1,mid+1,r,ql,qr);
    return ans;
}
map<pii,int> updated,upp;
pair<int,int> qq(int u,int v){
    pair<int,int> ans(0,0);
    //u is an ancestor of v.
    while(top[u]!=top[v]){
        int l=top[v];
        l=pos[l];
        l++;
        int r=pos[v];
        // dbg(pos[top[v]],r,u,v)
        ans.F+=query(1,1,mxn,l,r);
        ans.S+=query1(1,1,mxn,l,r);
        v=top[v];
        int t=up[v][0];
        if(updated.count({t,v})){
            ans.F+=updated[{t,v}];
            ans.S+=upp[{t,v}];
        }
        v=up[v][0];
    }
    int l=pos[u];
    l++;
    int r=pos[v];
    ans.F+=query(1,1,mxn,l,r);
    ans.S+=query1(1,1,mxn,l,r);
    return ans;
}
pair<int,int> qv(int u,int v){
    int l=LCA(u,v);
    pair<int,int> ans(0,0);
    pair<int,int> a=qq(l,u);
    pair<int,int> b=qq(l,v);
    // dbg(l,u,v,a.S,b.S)
    ans.F=a.F+b.F;
    ans.S=a.S+b.S;
    return ans;
}
int sum[mxn];
int nm[mxn];
int ans[mxn];
void bs(int l,int r,vector<vector<int>> &queries){
    if(l>r) return;
    if(queries.empty()) return;
    vector<vector<int>> ok,nok;
    int mid=(l+r)/2;
    for(int i=l;i<=mid;i++){
         int a=f[i][0];
         int b=f[i][1];
         int c=f[i][2];
         if(up[a][0]==b) swap(a,b);
         update(1,1,mxn,pos[b],c);
         updated[{a,b}]+=c;
         upp[{a,b}]++;
    }
    for(auto x:queries){
        int s=x[0];
        int t=x[1];
        pair<int,int> as=qv(s,t);
        if(sum[x[4]]>=as.F){
            sum[x[4]]-=as.F;
            nm[x[4]]-=as.S;
            ans[x[4]]=mid;
            ok.pb(x);
        }else{
            nok.pb(x);
        }
    }
    for(int i=l;i<=mid;i++){
        int a=f[i][0];
        int b=f[i][1];
        int c=f[i][2];
        if(up[a][0]==b) swap(a,b);
        update(1,1,mxn,pos[b],-c);
        updated.erase(make_pair(a,b));
        upp.erase(make_pair(a,b));
    }
    if(l==r){
        for(auto x:queries){
            if(nm[x[4]]>x[2]) ans[x[4]]=-1;
            else ans[x[4]]=x[2]-nm[x[4]];
        }
        return;
    }
    bs(l,mid,nok);vector<vector<int>>().swap(nok);
    bs(mid+1,r,ok);vector<vector<int>>().swap(ok);
}
signed main(){
ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
int n,m,q;
cin>>n>>m>>q;
for(int i=0;i+1<n;i++){
    int a,b;
    cin>>a>>b;
    v[a].pb(b);
    v[b].pb(a);
    ed.pb({a,b});
    mp[{a,b}]=mp[{b,a}]=i;
    mp2[i]={a,b};
}
for(int i=0;i<m;i++){
    int p,c;
    cin>>p>>c;
    p--;
    auto [a,b]=mp2[p];
    f.pb({a,b,c});
}
sort(all(f),[&](const auto &a,const auto &b ){
   return a[2]<b[2];
});
for(int i=0;i<q;i++){
    int s,t,x,y;
    cin>>s>>t>>x>>y;
    queries.pb({s,t,x,y,i});
    sum[i]=y;
}
dfs(1,1);
HLD(1,1,1);
for(auto x:f){
    int a=x[0];
    int b=x[1];
    int c=x[2];
    if(up[a][0]==b) swap(a,b);
    updated[{a,b}]+=c;
    upp[{a,b}]++;
    update(1,1,mxn,pos[b],c);
}
for(auto x:queries){
    int s=x[0];
    int t=x[1];
    nm[x[4]]=qv(s,t).S;
}
for(auto x:f){
    int a=x[0];
    int b=x[1];
    int c=x[2];
    if(up[a][0]==b) swap(a,b);
    updated.erase(make_pair(a,b));
    upp.erase(make_pair(a,b));
    update(1,1,mxn,pos[b],-c);
}
bs(0,m-1,queries);
for(auto x:queries){
    cout<<ans[x[4]]<<endl;
}
}

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