# JZOJ5650. NOI2018 Simulator 4.13 Bus Tour

Source: Internet
Author: User
Topics

Main Topic

is to give an n-point graph,
The Benquan of each edge is changed over time.
The shortest path to all points, starting from 1. Solving

For each edge,
The time to reach the next point through it is to add it to the waiting time.
Is the SPFA above the Benquan position slightly modified on it. Code

```#include <queue> #include <cstdio> #include <iostream> #include <algorithm> #include < cstring> #include <string.h> #include <cmath> #include <math.h> #include <time.h> #define LL l Ong long #define N 200003 #define M 103 #define DB double #define P putchar #define G getchar #define INF 998244353 #defin
e Pi 3.1415926535897932384626433832795 using namespace std;
Char ch;
Ch=g ();
while ((ch< ' 0 ' | | ch> ' 9 ') && ch!= '-') ch=g ();
ll W=1;
if (ch== '-') w=-1,ch=g ();
while (' 0 ' <=ch && ch<= ' 9 ') n= (n<<3) + (n<<1) +ch-' 0 ', ch=g ();
N*=w; } int max (int a,int b) {return a>b?a:b;} int min (int a,int b) {return a<b?a:b;} ll ABS (LL x) {return x<0?-x:x;} ll SQR (ll x) {return x*x;} void Write (ll x) {if (x>9) write (X/10);

P (x%10+ ' 0 ');}
int Nxt[n*2],to[n*2],k[n*2],b[n*2],lst[n],tot;
int n,m,s,t[n];
int q[n*10],f[n],l,r,x,y,st,v,w;

BOOL Bz[n]; void ins (int x,int y,inT T1,int T2) {nxt[++tot]=lst[x];
To[tot]=y;
Lst[x]=tot;
K[TOT]=T1;
B[tot]=t2;
} int main () {freopen ("bus.in", "R", stdin);

Freopen ("Bus.out", "w", stdout);
for (int j=2;j<=s;j++) read (T[j]), INS (t[j-1],t[j],s,j-2);
Ins (t[s],t[1],s,s-1);
} memset (F,127,sizeof (f));

memset (bz,1,sizeof (BZ));
for (f[q[r=1]=1]=l=bz[1]=0;l<r;)
{St=f[x=q[++l]];
for (int i=lst[x];i;i=nxt[i]) {y=to[i];w=st/k[i];
if (St%k[i]>b[i]) w++;
v=w*k[i]+b[i]+1;
if (f[y]>v) {f[y]=v;
if (Bz[y]) bz[q[++r]=y]=0;
}} bz[x]=1;
} for (int i=2;i<=n;i++) if (f[i]<f[0]) write (F[i]), P (");

else P ('-'), p (' 1 '), P (');
return 0;
}```
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