Submission #1197918

#	Time	Username	Problem	Language	Result	Execution time	Memory
1197918		guanex	Robot (JOI21_ho_t4)	C++20	34 / 100	3096 ms	78740 KiB

Main

#include<bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;
#define endl '\n'

//data structures

typedef pair<ll, ll> ii;
typedef vector<ii> vii;
typedef vector<ll> vll;
typedef vector<ld> vld;
typedef pair<long long, long long> pll;
typedef pair<char, ll> ci;
typedef pair<string, ll> si;
typedef vector<ll> vi;
typedef vector<string> vs;
typedef vector<vector<ll>> vvi;
#define pb push_back
#define pf push_front
#define popb pop_back
#define popf pop_front
#define sz(a) ((ll)a.size())
#define fi first
#define se second
#define whole(v) v.begin(), v.end()
#define rwhole(v) v.rbegin(), v.rend()
#define fro front
#define pqueue priority_queue
#define ubound upper_bound
#define lbound lower_bound
#define beg(v) v.begin()

//bit operations

ll flip(ll x){
    return ~(x) ^ (1 << 32);
}

ll allon(ll x){
    return (1LL << x) - 1;
}

bool bit(ll a, ll i){
    return (1LL << i) & a;
}

#define llpc(x) __builtin_popcountll(x)
#define ipc(x) __builtin_popcount(x)
#define iclz(x) __builtin_clz(x)
#define llclz(x) __builtin_clzll(x)
#define ictz(x) __builtin_ctz(x)
#define llctz(x) __builtin_ctzll(x)

//answers

#define cYES cout << "YES" << endl
#define cYes cout << "Yes" << endl
#define cyes cout << "yes" << endl
#define cNO cout << "NO" << endl
#define cNo cout << "No" << endl
#define cno cout << "no" << endl
#define ipsb cout << -1 << endl

const ll mod2 = 998244353;
const ll mod = 1000000007;
const ll inf = ll(1e18);

// read arr vec matr etc

#define fill(x, y) memset(x, y, sizeof(x))

void read(vector<ll> &x){
    for(auto &e:x) cin >> e;
}

void sread(vector<string> &x){
    for(auto &e:x) cin >> e;
}

void mread(vector<vector<ll>> &p, ll nnn, ll mmm){
    for(ll i = 0; i < nnn; ++i){
        vector<ll> pp;
        for(ll j = 0; j < mmm; ++j){
            ll wq; cin >> wq; pp.pb(wq);
        }
        p.pb(pp);
    }
}

// Solution

void tc(){
    int n, m; cin >> n >> m;
    ll dp[m+1][2][2]; //edge idx, node, color matters y/n
    for(int i = 0; i < m; ++i){
        dp[i][0][0] = inf; dp[i][0][1] = inf; dp[i][1][0] = inf; dp[i][1][1] = inf;
    }
    vvi ed(n);
    vvi edges;
    for(int i = 0; i < m; ++i){
        ll u, v, col, cost; cin >> u >> v >> col >> cost;
        u--;
        v--;
        edges.pb({u, v, col, cost});
        ed[u].pb(i);
        ed[v].pb(i);
    }
    vector<unordered_map<int, ll>> x(n+1);
    for(int i = 0; i < n; ++i){
        for(auto e:ed[i]){
            x[i][edges[e][2]] += edges[e][3];
        }
    }
    pqueue<vi, vvi,  greater<vi>> pq;
    for(auto e:ed[0]){
        ll totcost = x[0][edges[e][2]];
        totcost -= edges[e][3];
        ll othernode = 1;
        if(edges[e][0] != 0){
            othernode = 0;
        }
        pq.push({edges[e][3], e, othernode, 0});
        pq.push({totcost, e, othernode, 1});
        dp[e][othernode][0] = edges[e][3];
        dp[e][othernode][1] = totcost;
    }
    while(sz(pq)){
        vi state = pq.top();
        pq.pop();
        ll idx = state[1];
        ll cost = state[0];
        ll no = edges[idx][state[2]];
        ll fat = state[3];
        if(dp[idx][state[2]][fat] != cost)continue;
        for(auto e:ed[no]){
            if(e == idx)continue;
            ll me = 0;
            if(edges[e][0] == no){
                me = 1;
            }
            ll totcost = x[no][edges[e][2]];
            totcost -= edges[e][3];
            if(fat == 0 && edges[idx][2] == edges[e][2]){
                totcost -= edges[idx][3];
            }
            if(cost + edges[e][3] < dp[e][me][0]){
                dp[e][me][0] = cost + edges[e][3];
                pq.push({cost + edges[e][3], e, me, 0});
            }
            if(cost + totcost < dp[e][me][1]){
                dp[e][me][1] = cost + totcost;
                pq.push({cost + totcost, e, me, 1});
            }
        }
    }
    ll ans = inf;
    for(auto e:ed[n-1]){
        ll me = 0;
        if(edges[e][0] != n-1){
            me = 1;
        }
        ans = min(ans, min(dp[e][me][0], dp[e][me][1]));
    }
    if(ans == inf) ipsb;
    else cout << ans << endl;
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    ll t = 1;
    while(t--){
        tc();
    }
}

Compilation message (stderr)

Main.cpp: In function 'll flip(ll)':
Main.cpp:39:22: warning: left shift count >= width of type [-Wshift-count-overflow]
   39 |     return ~(x) ^ (1 << 32);
      |                    ~~^~~~~

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