Submission #812372

#	Time	Username	Problem	Language	Result	Execution time	Memory
812372		vjudge1	Olympic Bus (JOI20_ho_t4)	C++17	100 / 100	931 ms	10060 KiB

ho_t4

#include <bits/stdc++.h>



using namespace std;

#define TL ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define rall(s) s.rbegin(),s.rend()
#define all(s) s.begin(),s.end()
#define pb push_back
#define fi first
#define se second
#define ll long long
#define ld long double
#define YES cout<<"YES\n"
#define Yes cout<<"Yes\n"
#define yes cout<<"yes\n"
#define NO cout<<"NO\n"
#define No cout<<"No\n"
#define no cout<<"no\n"


const int N = 5e4 + 9 , mod = 1e9 + 7;
ll  d[N][10] ,us[N][10] ,  a[N] = {}, dp[N] ,  b[N] , c[N] , p[N];

vector<int>v[N][2] ;
ll M , cn = 0;
ll A , B , C ;

void dijkstra(int x , int k,int p , int o , int n){
    ll i , j , m , s , f ,l , r , y;
    for(i = 1; i <= n; i++){
        d[i][p] = 1e15;
        ::p[i] = 0;
    }
    for(i = 1; i <= M; i++)
        us[i][p] = 0;
    priority_queue<pair<ll,int>>st;
    d[x][p] = 0;
    st.push({0 , x});
    ll check = 0;
    while(!st.empty()){
        x = st.top().se  , f = -st.top().fi;
        st.pop();
        if(d[x][p] != f)
            continue;
        if(p == 0 && x == n)
            break;
        if(p == 2 && x == 1)
            break;
        if(x == A){
            if(d[A][p] + C < d[B][p]){
                ::p[B] = -1;
                d[B][p] = d[A][p] + C;
                st.push({-d[B][p] , B});

            }
        }
         for(auto to : v[x][k]){
            if(to == o)
                continue;
            if(k == 0)
                y = b[to];
            else
                y = a[to];
            if(d[x][p] + c[to] < d[y][p]){
                ::p[y]=  to;
                d[y][p] = d[x][p] + c[to];
                st.push({-d[y][p] , y});
            }
         }
    }
    for(i = 1; i <= n; i++){
        us[::p[i]][p] = 1;
    }
}
ll cnt = 0;
ll check[4] = {};
void get(int i , int n){
    check[0] = check[2] = 1;
    dijkstra(1 , 0 , 0 , i,  n);
    dijkstra(n , 0 , 2 , i,  n);
}
void add(int j , int n , int m){
    int i ;
    for(i = 1; i <= n; i++)
        d[i][j] = d[i][j + 4];
    for(i = 1; i <= m; i++)
        us[i][j] =  us[i][j + 4];
}

void solve(){
    ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
    cin>>n>>m;
    M = m;
    for(i = 1; i <= m; i++){
        cin>>a[i]>>b[i]>>c[i]>>dp[i];
        v[a[i]][0].pb(i);
        v[b[i]][1].pb(i);
    }
    dijkstra(1 , 0 , 0 , -1,  n);
    dijkstra(1 , 1 , 1 , -1,  n);
    dijkstra(n , 0 , 2 , -1 ,  n);
    dijkstra(n , 1 , 3 , -1 ,  n);
    for(i = 1; i <= n; i++)
        for(j = 0; j < 4; j++)
            d[i][j + 4] = d[i][j];
    for(i = 1; i <= m; i++)
        for(j = 0; j < 4; j++)
            us[i][j + 4] =  us[i][j];
    mn = d[n][0] + d[1][2];
    for(i = 1; i <= m; i++){
        for(j = 0; j < 4; j++)
            check[j] = 0;
        if(us[i][0] || us[i][2]){
           A = b[i];
           B = a[i];
           C = c[i];
            get(i , n);
        A = B = C = -1;
        mn = min(mn , d[n][0] + d[1][2] + dp[i]);
       // cout<<d[n][0]<<"\n";
        for(j = 0; j < 4; j++)
            if(check[j])
                add(j , n , m);
            continue;
        }
        x = min(d[n][0] , d[b[i]][0] + d[a[i]][3] + c[i]);
        y= min(d[1][2] , d[b[i]][2] + d[a[i]][1] + c[i]);
        mn = min(mn , x + y + dp[i]);
    }
   // cout<<cnt<<"\n";
    if(mn >= 1e15)
        mn = -1;
    cout<<mn<<"\n";
}

int main(){

     TL;
     /*
     #ifndef ONLINE_JUDGE
     freopen("input.txt", "r", stdin);
     freopen("output.txt", "w", stdout);
     #endif
     */
int t = 1;
//cin>>t;

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

}
// Author : حسن

Compilation message (stderr)

ho_t4.cpp: In function 'void dijkstra(int, int, int, int, int)':
ho_t4.cpp:33:12: warning: unused variable 'j' [-Wunused-variable]
   33 |     ll i , j , m , s , f ,l , r , y;
      |            ^
ho_t4.cpp:33:16: warning: unused variable 'm' [-Wunused-variable]
   33 |     ll i , j , m , s , f ,l , r , y;
      |                ^
ho_t4.cpp:33:20: warning: unused variable 's' [-Wunused-variable]
   33 |     ll i , j , m , s , f ,l , r , y;
      |                    ^
ho_t4.cpp:33:27: warning: unused variable 'l' [-Wunused-variable]
   33 |     ll i , j , m , s , f ,l , r , y;
      |                           ^
ho_t4.cpp:33:31: warning: unused variable 'r' [-Wunused-variable]
   33 |     ll i , j , m , s , f ,l , r , y;
      |                               ^
ho_t4.cpp:43:8: warning: unused variable 'check' [-Wunused-variable]
   43 |     ll check = 0;
      |        ^~~~~
ho_t4.cpp: In function 'void solve()':
ho_t4.cpp:125:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  125 |         for(j = 0; j < 4; j++)
      |         ^~~
ho_t4.cpp:128:13: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  128 |             continue;
      |             ^~~~~~~~
ho_t4.cpp:95:8: warning: unused variable 'q' [-Wunused-variable]
   95 |     ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
      |        ^
ho_t4.cpp:95:26: warning: unused variable 'z' [-Wunused-variable]
   95 |     ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                          ^
ho_t4.cpp:95:29: warning: unused variable 's' [-Wunused-variable]
   95 |     ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                             ^
ho_t4.cpp:95:37: warning: unused variable 'f' [-Wunused-variable]
   95 |     ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                     ^
ho_t4.cpp:95:41: warning: unused variable 'l' [-Wunused-variable]
   95 |     ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                         ^
ho_t4.cpp:95:45: warning: unused variable 'r' [-Wunused-variable]
   95 |     ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                             ^
ho_t4.cpp:95:49: warning: unused variable 'k' [-Wunused-variable]
   95 |     ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                                 ^
ho_t4.cpp:95:74: warning: unused variable 'mx' [-Wunused-variable]
   95 |     ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                                                          ^~

• Subtask 1: 5 / 5
• Subtask 2: 11 / 11
• Subtask 3: 21 / 21
• Subtask 4: 63 / 63