Submission #807506

#	Time	Username	Problem	Language	Result	Execution time	Memory
807506		vjudge1	Robot (JOI21_ho_t4)	C++17	58 / 100	3075 ms	102808 KiB

Main

#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 = 1e5 + 9 , mod = 1e9 + 7;
ll  d[N] = {} , dp[N] = {} , a[N] = {},  b[N] , c[N];


struct edge{
int to , cost;
};
set<int>st[N];
map<int,vector<edge>>v[N];
map<int,ll>sum[N] , d1[N];

void solve(){
    ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
    cin>>n>>m;
    for(i = 1; i <= m; i++){
        cin>>x>>y>>l>>r;
        st[x].insert(l);
        st[y].insert(l);
        v[x][l].pb({y , r});
        v[y][l].pb({x , r});
        sum[x][l] += r;
        sum[y][l] += r;
    }
    for(i = 1; i <= n; i++)
        d[i] = 1e18;
    set<pair<ll,pair<int,int>>>st;
    st.insert({0 , {0 , 1}});
    d[1] = 0;
    while(!st.empty()){
        x = st.begin()->fi , y = st.begin()->se.se , k = st.begin()->se.fi;
        st.erase(st.begin());
        if(k){
            if(d1[y][k] != x)
            continue;
            for(auto to : v[y][k]){
                z = x + sum[y][k] - to.cost;
                if(d[to.to] > z){

                    if(st.find({d[to.to] , {0 , to.to}}) != st.end())
                        st.erase({d[to.to] , {0 , to.to}});
                    d[to.to] = z , st.insert({d[to.to] , {0 , to.to }});
                }
            }
        }else {
            if(d[y] != x)
                continue;
            for(auto  it : ::st[y]){
                for(auto to : v[y][it]){
                    z = to.cost;
                    if(z >  sum[y][it] - to.cost)
                        z = sum[y][it] - to.cost;
                    z += x;
                    if(d[to.to] > z){
                    if(st.find({d[to.to] , {0 , to.to}}) != st.end())
                        st.erase({d[to.to] , {0 , to.to}});
                    d[to.to] = z , st.insert({d[to.to] , {0 , to.to}});
                    }
                    if(!d1[to.to].count(it) || x < d1[to.to][it])
                    if(st.find({d1[to.to][it] , {it , to.to}}) != st.end())
                        st.erase({d1[to.to][it] , {it , to.to}});
                        d1[to.to][it] = x;
                        st.insert({d1[to.to][it] , {it, to.to}});
                }
            }
        }
    }
    cout<<(d[n] >= 1e18 ? -1 : d[n])<<"\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)

Main.cpp: In function 'void solve()':
Main.cpp:41:21: warning: narrowing conversion of 'y' from 'long long int' to 'int' [-Wnarrowing]
   41 |         v[x][l].pb({y , r});
      |                     ^
Main.cpp:41:25: warning: narrowing conversion of 'r' from 'long long int' to 'int' [-Wnarrowing]
   41 |         v[x][l].pb({y , r});
      |                         ^
Main.cpp:42:21: warning: narrowing conversion of 'x' from 'long long int' to 'int' [-Wnarrowing]
   42 |         v[y][l].pb({x , r});
      |                     ^
Main.cpp:42:25: warning: narrowing conversion of 'r' from 'long long int' to 'int' [-Wnarrowing]
   42 |         v[y][l].pb({x , r});
      |                         ^
Main.cpp:81:21: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   81 |                     if(st.find({d1[to.to][it] , {it , to.to}}) != st.end())
      |                     ^~
Main.cpp:83:25: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   83 |                         d1[to.to][it] = x;
      |                         ^~
Main.cpp:35:8: warning: unused variable 'q' [-Wunused-variable]
   35 |     ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
      |        ^
Main.cpp:35:16: warning: unused variable 'j' [-Wunused-variable]
   35 |     ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                ^
Main.cpp:35:29: warning: unused variable 's' [-Wunused-variable]
   35 |     ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                             ^
Main.cpp:35:37: warning: unused variable 'f' [-Wunused-variable]
   35 |     ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                     ^
Main.cpp:35:61: warning: unused variable 'mn' [-Wunused-variable]
   35 |     ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                                             ^~
Main.cpp:35:74: warning: unused variable 'mx' [-Wunused-variable]
   35 |     ll q , i , j , m ,n, z ,s = 0 , f , l , r , k , x , y , mn  = 1e18 , mx = 0;
      |                                                                          ^~

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