Submission #1102376

#	Time	Username	Problem	Language	Result	Execution time	Memory
1102376		huyngodzz	Airplane (NOI23_airplane)	C++14	0 / 100	54 ms	23376 KiB

Main

    ///huynhocute123///
#include<bits/stdc++.h>
using namespace std;
#define S second
#define F first
#define pii pair<long long ,long long >
#define piii pair<int,pair<int,int>>
#define pb push_back
#define pi M_PI
#define FOR(i, a, b) for(int i = a; i <= b; ++i)
#define REP(i, a, b) for(int i = b; i >= a; --i)
#define ALL(v) v.begin(),v.end()
#define inp(name) if(fopen(name, "r")) freopen(name, "r", stdin);
#define out(name) if(fopen(name, "w")) freopen(name, "w", stdout);
//random_device rd;
//mt19937 rng(rd());
//#pragma GCC optimize ("O3")
//#pragma GCC optimize ("unroll-loops")
//#pragma GCC target("popcnt")
//#define int long long
const int maxN =  4 * 1e5 + 9;
const int  modd = 1e9 + 7;
const int base = 2309;
const long long MAX = 1e16+9;
void minimize(int &u, int v){
    if(v < u) u = v;
}
void maximize(int &u, int v){
    if(v > u) u = v;
}
int n, k, t, m, a[maxN];
long long res;
long long S[maxN], T[maxN];
int l, r;
bool vis[maxN];
vector<int> e[maxN];
priority_queue<pii ,vector<pii> ,greater<pii>>pq;
void dt1(int st){
    for(int i =1;i <= n ;i++){
        S[i] = MAX;
        T[i] = MAX;
    }
    S[1] = 0;
    pq.push({0 , 1});
    while(pq.size()){
        long long  du =pq.top().F , u = pq.top().S;
        pq.pop();
        if(du != S[u])continue;
        for(auto x : e[u]){
            if(S[x] > max(du + 1, a[x]*1LL) ){
                S[x] = max(du + 1, a[x]*1LL);
                pq.push({S[x], x});
            }
        }
    }

}
void dt2(int st){

    T[n] = 0;
    pq.push({0 , n});
    while(pq.size()){
        long long  du =pq.top().F , u = pq.top().S;
        pq.pop();
        if(du != T[u])continue;
        for(auto x : e[u]){
            if(T[x] > max(du + 1, a[x]*1LL) ){
                T[x] = max(du + 1, a[x]*1LL);
                pq.push({T[x], x});
            }
        }
    }

}
void solve(){
    cin >> n >> m;
    for(int i =1;i <= n ;i++)cin>> a[i];
    for(int i= 1;i <= m ;i++){
        cin >> l >> r;
        e[l].pb(r);
        e[r].pb(l);
    }
    dt1(1);
    dt2(n);
    res= MAX;
//    for(int i =1; i <= n ;i++){
//        cout <<i << " " << S[i] << " " << T[i] << '\n';
//    }
    for(int i =1;i <= n ;i++){
        res =min(res, max(S[i] , T[i])*2 );
        for(auto j : e[i]){
            if(a[j] == a[i])res= min(res, max(S[i] ,T[j])* 2 + 1);

        }
    }
    cout << res;
}
signed main(){
//    freopen("name.inp","r",stdin);
//    freopen("name.out","w",stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    inp("task.inp");
    t = 1;
   // cin >> t;
    while( t-- )solve();

}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:13:47: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 | #define inp(name) if(fopen(name, "r")) freopen(name, "r", stdin);
      |                                        ~~~~~~~^~~~~~~~~~~~~~~~~~
Main.cpp:103:5: note: in expansion of macro 'inp'
  103 |     inp("task.inp");
      |     ^~~

• Subtask 1: 0 / 22
• Subtask 2: 0 / 10
• Subtask 3: 0 / 31
• Subtask 4: 0 / 37