P1220 off the street light

Transmission DoorIdeas:

It is obvious that the interval motion regulation. Set f [i] [j] [K] to indicate that the position of the old Zhang is located [(k=0, at i), (K=1, at J)] when the street light from I to J is closed.

You can conclude that the transfer equation is:

f [i] [j] [0] = min (f [i+1] [j] [0] + cal (), F [i+1] [j] [1] + cal ());

f [i] [j] [1] = min (f[i] [j-1] [0] + cal (), f[I [j-1] [1] + cal ());

Note: Cal ()-pseudo code calculates the power consumed by street lights that are not closed when transferred from the previous interval.

Standard Process:

#include <iostream>#include<cstdio>#include<cstring>#include<algorithm>#include<cstdlib>#include<cmath>#include<string>#include<vector>#include<stack>#include<map>#include<Set>#include<queue>#include<deque>using namespacestd;#defineMAXN 60#defineINF 0x3fintSUM[MAXN],A[MAXN],B[MAXN];//A record position, B record powerintf[maxn][maxn][2];intN,c;inlineintRead () {intKr=1, xs=0; Charls; LS=GetChar ();  while(!isdigit (LS)) {        if(! (ls^ $)) KR=-1; LS=GetChar (); }     while(IsDigit (LS)) {xs= (xs<<1) + (xs<<3) + (ls^ -); LS=GetChar (); }    returnxs*KR;}intMain () {n=read (); c=read ();  for(intI=1; i<=n;i++) {A[i]=read (); B[i]=read ();//read into the distance of this lamp, the powersum[i]=sum[i-1]+b[i];//can take advantage of the prefix and quickly find the power from I to J and (below the moving gauge transfer to be used)} memset (F,inf,sizeof(f)); f[c][c][0]=f[c][c][1]=0;//just started at the point where the old Zhang was directly clear 0     for(intL=2; l<=n;l++)//enumeration Interval Length         for(intI=1; i+l-1<=n;i++)//Enumerate left endpoints        {            intj=i+l-1; f[i][j][0]=min (f[i+1][j][0]+ (a[i+1]-a[i]) * (Sum[i]+sum[n]-sum[j]), f[i+1][j][1]+ (A[j]-a[i]) * (sum[i]+sum[n]-sum[j])); f[i][j][1]=min (f[i][j-1][0]+ (A[j]-a[i]) * (sum[i-1]+sum[n]-sum[j-1]), f[i][j-1][1]+ (a[j]-a[j-1]) * (sum[i-1]+sum[n]-sum[j-1]));//can refer to pseudo-code} printf ("%d\n", Min (f[1][n][0],f[1][n][1]));//Outputreturn 0;}

P1220 off the street light