Rokua P1359 Rental Yacht

Title Description

The Changjiang Yacht Club has set up n yacht Rental station 1,2,...,n on the Changjiang River. Guests can rent a yacht at these yacht rental stations and return the yacht at any of the downstream yacht rental stations. The rental for yacht rental station I to yacht Rental station J is R (I,j), 1<=i<=j<=n. Try to design an algorithm that calculates the minimum rent required from the yacht rental Station 1 to the yacht rental station N.

For a given yacht rental station I will rent a rental of R (i,j) between the yacht rental station J, 1<=i<j<=n, and calculate the minimum rent required from the yacht rental Station 1 to the yacht rental station N.

Ensure that no value exceeds 10^6 at any time during the calculation

Input/output format

Input format:

The input data is provided by the file. The 1th line of the file has 1 positive integer n (n<=200), indicating that there are n yacht rental stations. The next n-1 line is a semi-matrix R (i,j), 1<=i<j<=n.

Output format:

At the end of the program run, the calculated minimum rent from the yacht rental Station 1 to the yacht rental station n is output to the file.

Input and Output Sample input example # #:

35 157

Sample # # of output:

12

SPFA has a forward edge

#include <iostream>#include<cstring>#include<cstdio>#defineINF 0x7fffffff#defineMX 50010using namespacestd;structNode {intTo,next,dis;} E[MX];intHEAD[MX],DS[MX];BOOLVIS[MX];intN,i,j,k,tot;voidAddintUintVintW) {Tot++; E[tot].to=v; E[tot].next=Head[u]; Head[u]=tot; E[tot].dis=W;}voidSPFA (intN) {    intL=0, r=0, que[ .];  for(i=1; i<=k;++i) {Ds[i]=INF; Vis[i]=0; } R++; QUE[R]=N; Ds[n]=0; VIS[K]=1;  while(l<=r) {L++; inttop=Que[l]; Vis[top]=0;  for(i=head[top];i;i=E[i].next) {            intv=e[i].to; if(ds[v]>ds[top]+E[i].dis) {Ds[v]=ds[top]+E[i].dis; if(!Vis[v]) {Vis[v]=1; R++; QUE[R]=v; }            }        }    }}intMain () {intc,x=0, y=0; CIN>>K;  for(i=1; i<=k-1;++i) { for(j=i+1; j<=k;++j) {cin>>C;        Add (I,J,C); }} SPFA (1); cout<<ds[k];}

Rokua P1359 Rental Yacht