Submission #1289497

#	Time	Username	Problem	Language	Result	Execution time	Memory
1289497		sitingfake	Robot (JOI21_ho_t4)	C++20	0 / 100	109 ms	18824 KiB

Main

#include<bits/stdc++.h>
using namespace std;

// define

#define execute cerr << " Time: " << fixed << setprecision(6) << (1.0 * clock() / CLOCKS_PER_SEC) << "s\n";
#define ll long long
#define ii pair <int , int>
#define iii pair <int , ii>
#define se second
#define fi first
#define all(v) (v).begin() , (v).end()
#define Unique(v) sort(all(v)) , v.resize(unique(all(v)) - v.begin())
#define bit(x,i) (((x) >> (i)) & 1LL)
#define flip(x,i) ((x) ^ (1LL << (i)))
#define ms(d,x) memset(d , x , sizeof(d))
#define exist __exist
#define ends __ends
#define visit visited
#define left __left
#define right __right
#define sitingfake 1
#define orz 1
//constant

const long long mod = 1e9 + 7;
const long long linf = 4557430888798830399LL;
const long long nlinf = -4485090715960753727LL;
const int inf = 1061109567;
const int ninf = -1044266559;
const int dx[] = {0 , -1 , 0 , 1};
const int dy[] = {-1 , 0 , 1 , 0};

template<typename T> bool maximize(T &a, const T &b)
{
    if(a < b) {a = b; return 1;}
    return 0;
}

template<typename T> bool minimize(T &a, const T &b)
{
    if(a > b) {a = b; return 1;}
    return 0;
}

void Plus(ll & a ,ll b)
{
    b %= mod;
    a += b;
    if(a < 0) a += mod;
    a %= mod;
    return;
}

void Mul(ll & a, ll b)
{
    (a *= (b % mod)) %= mod;
    return;
}

//code
const int maxn = 1e5 + 7;

ll dist[maxn][2];
ll sum[2 * maxn];

int n , m;
struct edges
{
    int v;
    int from;
    int c;
    int w;
};
vector <edges> adj[maxn];

void solve(void)
{
    cin >> n >> m;
    for(int i = 1; i <= m; i++)
    {
        int u , v , c , w;
        cin >> u >> v >> c >> w;
        int szu = adj[u].size();
        int szv = adj[v].size();
        adj[u].push_back({v , szv , c , w});
        adj[v].push_back({u , szu , c , w});
    }

    ms(dist , 0x3f);

    dist[1][0] = dist[1][1] = 0;

    priority_queue <pair <ll , iii> ,vector<pair <ll , iii>> , greater <pair <ll , iii>>> pq;
    pq.push({0 , {1 , {adj[1].size() , 0}}});
    while(!pq.empty())
    {
        int u = pq.top().se.fi;
        ll cost = pq.top().fi;
        int from = pq.top().se.se.fi;
        int t = pq.top().se.se.se;
        pq.pop();
        if(cost > dist[u][t]) continue;

        for(int i = 0; i < adj[u].size(); i++)
        {
            if(i == from && t == 1) continue;
            sum[adj[u][i].c] += adj[u][i].w;
        }

        for(int i = 0; i < adj[u].size(); i++)
        {
            if(i == from) continue;
            int v = adj[u][i].v;
            int to = adj[u][i].from;
            int color = adj[u][i].c;
            ll w = adj[u][i].w;
            if(minimize(dist[v][1] , dist[u][t] + w))
            {
                pq.push({dist[v][1] , {v , {to , 1}}});
            }

            if(minimize(dist[v][0] , dist[u][t] + sum[color] - w))
            {
                pq.push({dist[v][0] , {v , {to , 0}}});
            }
        }

        for(int i = 0; i < adj[u].size(); i++)
        {
            if(i == from && t == 1) continue;
            sum[adj[u][i].c] -= adj[u][i].w;
        }
    }


    ll ans = linf;
    ans = min({ans , dist[n][1] , dist[n][0]});
    if(ans == linf) cout << "-1";
    else cout << ans;
}
/**
**/
signed main()
{
   ios_base::sync_with_stdio(0);
   cin.tie(0);
   cout.tie(0);

   #define task ""

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

   int tc = 1;
//   cin >> tc;
   while(tc--) solve();

//   execute;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:154:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  154 |        freopen(task".inp","r",stdin);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:155:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  155 |        freopen(task".out","w",stdout);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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