Submission #7663

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
7663	2014-08-13 11:45:31	imsifile	Split the sequence (APIO14_sequence)	C++98	100 / 100	604 ms	84764 KiB

sequence

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#include<stdio.h>
#define sq(a) ((a)*(a))
#define sik(l,x) (-(l.a)*(x)+(l.b))
typedef long long lld;
struct lin {
  int ix;
  lld a, b; // -ax+b
}stk[100100], im;
int n, k, di[100100][202], scn;
lld ba[100100], dy[100100][2];
int main(){
  int i, i2, j, t=1;
  scanf("%d%d", &n, &k);
  for(i=1; i<=n; i++){
    scanf("%lld", &ba[i]), ba[i]+=ba[i-1];
    dy[i][0]=sq(ba[i]);
  }
  for(j=1; j<=k; j++){
    im.a=2*ba[j], im.b=dy[j][1-t]+sq(ba[j]), im.ix=j;
    stk[0]=im, scn=1;
    for(i=1; i<=j; i++)dy[i][t]=0;
    for(i=j+1, i2=0; i<=n; i++){
      for(; i2<scn-1; i2++){
        if(sik(stk[i2],ba[i])<sik(stk[i2+1],ba[i]))break;
      }
      di[i][j]=stk[i2].ix, dy[i][t]=sq(ba[i])+sik(stk[i2],ba[i]);
 
 
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• Subtask 1: 11 / 11
• Subtask 2: 11 / 11
• Subtask 3: 11 / 11
• Subtask 4: 17 / 17
• Subtask 5: 21 / 21
• Subtask 6: 29 / 29