Submission #564215

#	Time	Username	Problem	Language	Result	Execution time	Memory
564215		dxz05	Robot (JOI21_ho_t4)	C++14	0 / 100	374 ms	92352 KiB

Main

#pragma GCC optimize("Ofast,O2,O3,unroll-loops")
#pragma GCC target("avx2")

#include <bits/stdc++.h>

using namespace std;

void debug_out() { cerr << endl; }

template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << "[" << H << "]";
    debug_out(T...);
}

#ifdef dddxxz
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define SZ(s) ((int)s.size())
#define all(x) (x).begin(), (x).end()
#define lla(x) (x).rbegin(), (x).rend()
#define bpc(x) __builtin_popcount(x)
#define bpcll(x) __builtin_popcountll(x)

clock_t startTime;

double getCurrentTime() {
    return (double) (clock() - startTime) / CLOCKS_PER_SEC;
}

#define MP make_pair

typedef long long ll;
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const double eps = 0.000001;
const int MOD = 1e9 + 7;
const int INF = 1000000101;
const long long LLINF = 1223372000000000555;
const int N = 1e6 + 3e2;
const int M = 1248;

vector<pair<int, int>> g[N];
map<int, int> mp[N];

int d[N];
bool processed[N];

void solve(int TC) {
    int n, m;
    cin >> n >> m;

    for (int i = 1; i <= m; i++){
        int a, b, c, p;
        cin >> a >> b >> c >> p;

        g[a].emplace_back(b, c);
        g[b].emplace_back(a, c);
        mp[a][c]++;
        mp[b][c]++;
    }

    for (int i = 1; i <= n; i++){
        for (auto &e : g[i]){
            int &c = e.second;
            c = (mp[i][c] == 1 ? 0 : 1);
        }
    }

    fill(d + 1, d + n + 1, INF);

    priority_queue<pair<int, int>> pq;
    pq.push(MP(0, 1));
    d[1] = 0;

    while (!pq.empty()){
        int x = pq.top().second; pq.pop();
        if (processed[x]) continue;
        processed[x] = true;

        for (auto now : g[x]){
            int y = now.first, w = now.second;
            if (d[y] > d[x] + w){
                d[y] = d[x] + w;
                pq.push(MP(-d[y], y));
            }
        }

    }

    if (!processed[n]){
        cout << -1 << endl;
    } else {
        cout << d[n] << endl;
    }

}

int main() {
    startTime = clock();
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);

#ifdef dddxxz
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif

    int TC = 1;
    //cin >> TC;

    for (int test = 1; test <= TC; test++) {
        //debug(test);
        //cout << "Case #" << test << ": ";
        solve(test);
    }

#ifdef dddxxz
    cerr << endl << "Time: " << int(getCurrentTime() * 1000) << " ms" << endl;
#endif

    return 0;
}

• Subtask 1: 0 / 34
• Subtask 2: 0 / 24
• Subtask 3: 0 / 42