Submission #41285

#	Time	Username	Problem	Language	Result	Execution time	Memory
41285		IvanC	K blocks (IZhO14_blocks)	C++14	0 / 100	1070 ms	4488 KiB

blocks

#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int> ii;
const int INF = 1e9;
const int MAXN = 1e5  + 10;
const int MAXK = 101;
int vetor[MAXN],dp[MAXK][MAXN],N,K,seg[4*MAXN];
void build(int pos,int left,int right){
	if(left == right){
		seg[pos] = vetor[left];
		return;
	}
	int mid = (left+right)/2;
	build(2*pos,left,mid);
	build(2*pos+1,mid+1,right);
	seg[pos] = max(seg[2*pos],seg[2*pos+1]);
}
int query(int pos,int left,int right,int i,int j){
	if(left >= i && right <= j) return seg[pos];
	int mid = (left+right)/2;
	if(j <= mid) return query(2*pos,left,mid,i,j);
	else if(i >= mid + 1) return query(2*pos+1,mid+1,right,i,j);
	return max(query(2*pos,left,mid,i,j),query(2*pos+1,mid+1,right,i,j));
}
void solve(int G,int l1,int l2,int opt1,int opt2){
	if(l1 > l2) return;
	int lm = (l1+l2)/2;
	int best = INF;
	int optimal = -1;
	for(int cand = opt1;cand<=min(opt2,lm - 1);cand++){
		int novo = dp[G-1][cand] + query(1,1,N,cand+1,lm);
		if(novo < best){
			best = novo;
			optimal = cand;
		} 
	}
	dp[G][lm] = best;
	solve(G,l1,lm-1,opt1,optimal);
	solve(G,lm+1,l2,optimal,opt2);
}
int main(){
	scanf("%d %d",&N,&K);
	for(int i = 1;i<=N;i++) scanf("%d",&vetor[i]);
	build(1,1,N);
	for(int i = 1;i<=N;i++){
		dp[1][i] = query(1,1,N,1,i);
	}
	for(int k = 2;k<=K;k++){
		solve(k,k,N,k-1,N-1);
	}
	printf("%d\n",dp[K][N]);
	return 0;
}

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:42:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&N,&K);
                      ^
blocks.cpp:43:47: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i = 1;i<=N;i++) scanf("%d",&vetor[i]);
                                               ^

• Subtask 1: 0 / 14
• Subtask 2: 0 / 18
• Subtask 3: 0 / 21
• Subtask 4: 0 / 47