Submission #1061251

#	Time	Username	Problem	Language	Result	Execution time	Memory
1061251		12345678	Reconstruction Project (JOI22_reconstruction)	C++17	0 / 100	154 ms	372 KiB

reconstruction

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define int long long
#pragma gcc-optimize("o3, unroll-loops")

const int nx=5e2+5, mx=1e3+5;

ll n, m, a[mx], b[mx], w[mx], x, q, L[nx], R[nx], dsu[nx];
vector<ll> dp[nx];
priority_queue<pair<ll, ll>, vector<pair<ll, ll>>, greater<pair<ll, ll>>> add, rem;

int find(int x)
{
    if (dsu[x]==x) return x;
    return dsu[x]=find(dsu[x]);
}

bool isused(ll idx, ll cw)
{
    for (int i=1; i<=n; i++) dsu[i]=i;
    vector<pair<ll, ll>> v;
    for (int i=1; i<=m; i++) v.push_back({abs(w[i]-cw), i});
    sort(v.begin(), v.end());
    for (auto [_, i]:v)
    {
        if (find(a[i])==find(b[i])) 
        {
            return 0;
            continue;
        }
        dsu[find(a[i])]=find(b[i]);
        if (i==idx) return 1;
    }
}

int32_t main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>m;
    for (int i=1; i<=m; i++) cin>>a[i]>>b[i]>>w[i];
    for (int i=1; i<=m; i++)
    {
        if (!isused(i, w[i])) continue;
        ll l=1, r=w[i];
        while (l<r)
        {
            ll md=(l+r)/2;
            if (isused(i, md)) r=md;
            else l=md+1;
        }
        add.push({l, i});
        l=w[i], r=2e9;
        while (l<r)
        {
            ll md=(l+r+1)/2;
            if (isused(i, md)) l=md;
            else r=md-1;
        }
        rem.push({l, i});
    }
    cin>>q;
    set<ll> edg;
    while (q--)
    {
        cin>>x;
        while (!add.empty()&&add.top().first<=x) edg.insert(add.top().second), add.pop();
        while (!rem.empty()&&rem.top().first<x) edg.erase(rem.top().second), rem.pop();
        ll res=0;
        for (auto tmp:edg) res+=abs(w[tmp]-x); //cout<<tmp<<' '<<a[tmp]<<' '<<b[tmp]<<' '<<w[tmp]<<'\n';
        cout<<res<<'\n'; 
        
    }
}

Compilation message (stderr)

reconstruction.cpp:7: warning: ignoring '#pragma gcc ' [-Wunknown-pragmas]
    7 | #pragma gcc-optimize("o3, unroll-loops")
      | 
reconstruction.cpp: In function 'bool isused(long long int, long long int)':
reconstruction.cpp:24:26: warning: control reaches end of non-void function [-Wreturn-type]
   24 |     vector<pair<ll, ll>> v;
      |                          ^

• Subtask 1: 0 / 3
• Subtask 2: 0 / 4
• Subtask 3: 0 / 7
• Subtask 4: 0 / 28
• Subtask 5: 0 / 35
• Subtask 6: 0 / 23