This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
///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])res =min(res,max(T[i] ,S[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:100:5: note: in expansion of macro 'inp'
100 | inp("task.inp");
| ^~~
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