Submission #1037808

#	Time	Username	Problem	Language	Result	Execution time	Memory
1037808		tradz	Robot (JOI21_ho_t4)	C++14	100 / 100	158 ms	41620 KiB

Main

#include <bits/stdc++.h>

#define For(i,a,b) for(int i = a; i <= b; i++)
#define Ford(i,a,b) for(int i = a; i >= b; i--)
#define ll long long
#define ii pair<ll,ll>
#define fi first
#define se second
#define all(v) v.begin(),v.end()
#define RRH(v) v.resize(unique(all(v)) - v.begin())

using namespace std;
const int  N = 1e6+7;
const int M = 1e9+7;
const ll oo = 1e18;

int n, m;

ll d[N];
struct data {
    int v, c;ll p;
};

vector<data> g[N];

void dij() {
    For (i, 2, n) d[i] = oo;
    d[1] = 0;
    priority_queue<ii, vector<ii>, greater<ii>> q;
    q.push({0ll, 1});
    unordered_map<ll,ll> ma, min_c;
    while ((int)q.size() > 0) {
        ii k = q.top();
        q.pop();
        if (d[k.se] != k.fi) continue;
        for (auto x: g[k.se]) min_c[x.c] = oo, ma[x.c] = 0;
        for (auto x: g[k.se]) {
            ma[x.c] += x.p;
            min_c[x.c] = min(min_c[x.c], d[x.v]);
        }
        for (auto x: g[k.se]) {
            if (d[x.v] > k.fi + min(x.p, ma[x.c] - x.p)) {
                d[x.v] = k.fi + min(x.p, ma[x.c] - x.p);
                q.push({d[x.v], x.v});
            }
            if (ma[x.c] > x.p) if (d[x.v] > min_c[x.c] + ma[x.c] - x.p) {
                d[x.v] = min_c[x.c] + ma[x.c] - x.p;
                q.push({d[x.v], x.v});
            }
        }
    }
    if (d[n] >= oo) d[n] = -1;
}

int main() {
    ios::sync_with_stdio(0); cin.tie(0);

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

    cin >> n >> m;
    For (i, 1, m) {
        int u, v, c, p; cin >> u >> v >> c >> p;
        g[u].push_back({v, c, p});
        g[v].push_back({u, c, p});
    }

    dij();

    cout << d[n] << '\n';

    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:60:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |         freopen (".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~
Main.cpp:61:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         freopen (".out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
Main.cpp:64:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         freopen(TASK".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:65:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen(TASK".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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