Submission #445868

#	Time	Username	Problem	Language	Result	Execution time	Memory
445868		cpp219	Robot (JOI21_ho_t4)	C++14	34 / 100	3080 ms	57900 KiB

Main

#pragma GCC optimization O2
#pragma GCC optimization "unroll-loop"
#pragma target ("avx2")

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define fs first
#define sc second
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 1e5 + 9;
const ll Log2 = 20;
const ll inf = 1e16 + 7;

map<LL,ll> mp,All;
vector<ll> d[N][2];

ll n,m,x,y,c,p,ans = inf;
struct Edge{
    ll to,c,p;
};
vector<Edge> g[N];

struct Node{
    ll val,i,change,prv;
};

bool operator < (Node a,Node b){
    return a.val > b.val;
}
priority_queue<Node> pq;

int main(){
    ios_base::sync_with_stdio(NULL); cin.tie(0); cout.tie(0);
    #define task "test"
    if (fopen(task".INP","r")){
        freopen(task".INP","r",stdin);
        freopen(task".OUT","w",stdout);
    }
    cin>>n>>m;
    while(m--){
        cin>>x>>y>>c>>p;
        mp[{x,y}] = g[x].size(); mp[{y,x}] = g[y].size();
        g[x].push_back({y,c,p}); g[y].push_back({x,c,p});
    }
    for (ll i = 1;i <= n;i++){
        d[i][0].resize(g[i].size() + 3); d[i][1].resize(g[i].size() + 3);
        for (ll j = 0;j < d[i][0].size();j++){
            d[i][0][j] = d[i][1][j] = inf;
            if (i == 1) d[i][0][j] = d[i][1][j] = 0;
        }
        for (auto j : g[i]) All[{i,j.c}] += j.p;
    }
    pq.push({0,1,0,inf});
    while(!pq.empty()){
        //cout<<"?";
        Node t = pq.top(); pq.pop();
        ll u = t.i;
        if (u == n){
            ans = min(ans,t.val);
        }
        for (ll i = 0;i < g[u].size();i++){
            if (i == t.prv) continue;
            ll curC = g[u][i].c,v = g[u][i].to,L = g[u][i].p,change;
            ll cost = All[{u,curC}] - L;
            if (t.prv != inf && g[u][i].c == g[u][t.prv].c && t.change)
                cost -= g[u][t.prv].p;
            assert(t.change <= 1);
            //assert(cost >= 0);
            ll id = mp[{v,u}];
            if (d[v][0][id] > t.val + cost){
                d[v][0][id] = t.val + cost; //cout<<d[5][1][0]; return 0;
                //cout<<v<<" "<<1<<" "<<id<<" "<<t.val + cost<<"\n";
                pq.push({t.val + cost,v,0,id});
            }
            if (d[v][1][id] > t.val + L){
                d[v][1][id] = t.val + L; //cout<<d[5][1][0]; return 0;
                //cout<<v<<" "<<1<<" "<<id<<" "<<t.val + cost<<"\n";
                pq.push({t.val + L,v,1,id});
            }
        }
    }
    /// node   change   prv
    //cout<<g[2][1].to; return 0;
    //cout<<d[2][0][1]; return 0;
    if (ans != inf) cout<<ans;
    else cout<<-1;
}

Compilation message (stderr)

Main.cpp:1: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    1 | #pragma GCC optimization O2
      | 
Main.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization "unroll-loop"
      | 
Main.cpp:3: warning: ignoring '#pragma target ' [-Wunknown-pragmas]
    3 | #pragma target ("avx2")
      | 
Main.cpp: In function 'int main()':
Main.cpp:49:25: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |         for (ll j = 0;j < d[i][0].size();j++){
      |                       ~~^~~~~~~~~~~~~~~~
Main.cpp:63:25: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |         for (ll i = 0;i < g[u].size();i++){
      |                       ~~^~~~~~~~~~~~~
Main.cpp:65:62: warning: unused variable 'change' [-Wunused-variable]
   65 |             ll curC = g[u][i].c,v = g[u][i].to,L = g[u][i].p,change;
      |                                                              ^~~~~~
Main.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:39:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |         freopen(task".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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