Submission #1040359

#	Time	Username	Problem	Language	Result	Execution time	Memory
1040359		Neco_arc	Evacuation plan (IZhO18_plan)	C++17	100 / 100	317 ms	48072 KiB

plan

#include <bits/stdc++.h>

#define ll long long
#define all(x) x.begin(), x.end()
#define Neco "Evacuation plan"
#define resp(x) sort(all(x)), x.resize(unique(all(x)) - x.begin())
#define getbit(x,i) ((x >> i)&1)
#define _left id * 2, l, mid
#define _right id * 2 + 1, mid + 1, r
#define cntbit(x) __builtin_popcountll(x)
#define fi(i, a, b) for(int i = a; i <= b; i++)
#define fid(i, a, b) for(int i = a; i >= b; i--)
#define maxn (int) 2e5 + 7

using namespace std;

const ll mod = 1e9 + 7; //972663749
const ll base = 911382323;

int n, m, q, k;
int spe[maxn], P[maxn];
vector<pair<int, int>> edges[maxn];
ll dist[maxn], ans[maxn];

void DJK() {
    priority_queue<pair<ll, int>, vector<pair<ll, int>>, greater<pair<ll, int>> > q;

    memset(dist, 60, sizeof dist);
    fi(i, 1, k) q.push({0, spe[i]}), dist[spe[i]] = 0;



    while(!q.empty()) {
        int u = q.top().second; ll g = q.top().first;
        q.pop();
        if(g > dist[u]) continue;

        for(auto [v, w] : edges[u]) if(dist[v] > dist[u] + w) {
            dist[v] = dist[u] + w;
            q.push({dist[v], v});
        }
    }
}

struct DSU {
    set<int> S[maxn];
    int lab[maxn];

    DSU() { memset(lab, -1, sizeof lab); }
    int get_rt(int u) { return lab[u] < 0 ? u : lab[u] = get_rt(lab[u]); }
    void uni(int u, int v, ll w) {
        int p = get_rt(u), q = get_rt(v); if(p == q) return;
        if(lab[p] > lab[q]) swap(p, q);

        for(int x : S[q]) {
            if(S[p].find(x) != S[p].end()) ans[x] = w, S[p].erase(x);
            else S[p].insert(x);
        }
        S[q].clear();

        lab[p] += lab[q], lab[q] = p;
    }

} Dsu;

void solve()
{

    cin >> n >> m;
    fi(i, 1, m) {
        int x, y, w; cin >> x >> y >> w;
        edges[x].push_back({y, w});
        edges[y].push_back({x, w});
    }
    cin >> k;
    fi(i, 1, k) cin >> spe[i];

    cin >> q;
    fi(i, 1, q) {
        int x, y; cin >> x >> y;
        Dsu.S[x].insert(i), Dsu.S[y].insert(i);
    }

    DJK();
    fi(i, 1, n) P[i] = i;

    sort(P + 1, P + 1 + n, [](int x, int y) {
            return dist[x] > dist[y];
        });


    fi(i, 1, n) {
        int u = P[i];
        for(auto [v, w] : edges[u]) if(dist[v] >= dist[u]) Dsu.uni(u, v, dist[u]);
    }

    fi(i, 1, q) cout << ans[i] << '\n';

}


int main()
{

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    if(fopen(Neco".inp", "r")) {
        freopen(Neco".inp", "r", stdin);
        freopen(Neco".out", "w", stdout);
    }


    int nTest = 1;
//    cin >> nTest;


    while(nTest--)
    {
        solve();
    }


    return 0;
}

Compilation message (stderr)

plan.cpp: In function 'int main()':
plan.cpp:110:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  110 |         freopen(Neco".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
plan.cpp:111:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  111 |         freopen(Neco".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 13 / 13
• Subtask 3: 12 / 12
• Subtask 4: 19 / 19
• Subtask 5: 46 / 46