Submission #1356559

#TimeUsernameProblemLanguageResultExecution timeMemory
1356559kokokaiReconstruction Project (JOI22_reconstruction)C++20
100 / 100
887 ms26844 KiB
#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define fi first
#define se second
#define task "text"
#define int long long
struct DSU{
    int lab[501];
    void clea(){
        memset(lab,-1,sizeof lab);
    }
    int findpar(int u){
        if(lab[u]<0) return u;
        return lab[u]=findpar(lab[u]);
    }
    bool unite(int u,int v){
        u=findpar(u);
        v=findpar(v);
        if(u==v) return false;
        if(lab[u]>lab[v]) swap(u,v);
        lab[u] += lab[v];
        lab[v] = u;
        return true;
    }
    int connect(int u,int v){
        return findpar(u) == findpar(v);
    }
}dsu;
struct edge{
    int u,v,w;
    bool operator < (edge &oth) const{
        return w < oth.w;
    }
}e[100001];
const int N = 1e5+4;
int n,m,q;
int L[N],R[N];
struct eve{
    int x,num,coff;
    bool operator < (eve &oth) const{
        return x < oth.x;
    }
};
signed main(){
    ios::sync_with_stdio(false);cin.tie(nullptr);
    if(fopen(task".inp","r")){
        freopen(task".inp","r",stdin);
    }
    cin>>n>>m;
    for(int i=1;i<=m;i++){
        cin>>e[i].u>>e[i].v>>e[i].w;
    }

    sort(e+1,e+1+m);
    //cerr<<1<<'\n';
    for(int i=1;i<=m;i++){
        dsu.clea();
        for(int j=i-1;j>=1;j--){
            dsu.unite(e[j].u,e[j].v);
            if(dsu.connect(e[i].u,e[i].v)){
                int w=(e[j].w+e[i].w)/2;
                L[i]=w+1;
                //if(i == 4) cerr<<w<<'\n';
                break;
            }
        }
    }
    for(int i=m;i>=1;i--){
        dsu.clea();
        for(int j=i+1;j<=m;j++){
            dsu.unite(e[j].u,e[j].v);
            if(dsu.connect(e[i].u,e[i].v)){
                int w=(e[i].w+e[j].w)/2;
                R[i]=w;
                break;
            }
        }
    }
    //cerr<<1<<'\n';
    for(int i=1;i<=m;i++){
        //cerr<<e[i].u<<' '<<e[i].v<<' '<<e[i].w<<'\n';
    }
    vector<eve> event;
    for(int i=1;i<=m;i++){
        if(R[i] == 0) R[i]=1e9;
        event.push_back({L[i],-e[i].w,1});
        event.push_back({e[i].w+1,+e[i].w,-1});
        event.push_back({e[i].w+1,e[i].w,-1});
        event.push_back({R[i]+1,-e[i].w,1});
    }

    sort(event.begin(),event.end());
    int i=0;
    int q;
    cin>>q;
    int sum=0,coff=0;
    while(q--){
        int x;
        cin>>x;
        while(i<event.size() && event[i].x <= x){
            sum += event[i].num;
            coff += event[i].coff;
            i++;
        }
        int ans=x*coff+sum;
        cout<<-ans<<'\n';
    }
}

Compilation message (stderr)

reconstruction.cpp: In function 'int main()':
reconstruction.cpp:48:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
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