Submission #13369

# Submission time Handle Problem Language Result Execution time Memory
13369 2015-02-13T17:57:46 Z baneling100 Mountain Trek Route (IZhO12_route) C++
100 / 100
237 ms 17612 KB
#include <stdio.h>
#include <algorithm>
#include <vector>
#include <queue>
#define N_MAX 1000000
#include <stdlib.h>
using namespace std;

typedef pair <int,int> ppair;
priority_queue <ppair,vector<ppair>,greater<ppair> > PQ;
int N, K, Ans;
int M, Block[N_MAX+1], Size[N_MAX+1];
int Left[N_MAX+1], Right[N_MAX+1];

int main(void) {

    int i, inp, t1, t2, h1, h2;

    scanf("%d %d",&N,&K);
    Block[0]=-1;
    for(i=1 ; i<=N ; i++) {
        scanf("%d",&inp);
        if(Block[M]==inp) Size[M]++;
        else Block[++M]=inp, Size[M]=1;
    }
    if(M>1 && Block[1]==Block[M]) Size[1]+=Size[M--];
    if(M==1) {
        printf("0");
        return 0;
    }
    if(Block[M]>Block[1]) Left [1]=M;
    if(Block[1]<Block[2]) Right[1]=2;
    if(Left[1] && Right[1]) PQ.push(make_pair(Size[1],1));
    for(i=2 ; i<=M-1 ; i++) {
        if(Block[i-1]>Block[i  ]) Left [i]=i-1;
        if(Block[i  ]<Block[i+1]) Right[i]=i+1;
        if(Left[i] && Right[i]) PQ.push(make_pair(Size[i],i));
    }
    if(Block[M-1]>Block[M]) Left [M]=M-1;
    if(Block[M  ]<Block[1]) Right[M]=1;
    if(Left[M] && Right[M]) PQ.push(make_pair(Size[M],M));
    while(!PQ.empty()) {
        t1=PQ.top().first, t2=PQ.top().second, PQ.pop();
        h1=K/t1;
        h2=min(Block[Left[t2]],Block[Right[t2]])-Block[t2];
        if(h1<h2) {
            Ans+=h1<<1;
            break;
        }
        else {
            Ans+=h2<<1;
            K-=t1*h2;
            if(Block[Left[t2]]<Block[Right[t2]]) {
                Size [Left[t2]]+=Size [t2];
                Right[Left[t2]] =Right[t2];
                if(Left[Left[t2]]) PQ.push(make_pair(Size[Left[t2]],Left[t2]));
            }
            else if(Block[Left[t2]]>Block[Right[t2]]) {
                Size[Right[t2]]+=Size[t2];
                Left[Right[t2]] =Left[t2];
                if(Right[Right[t2]]) PQ.push(make_pair(Size[Right[t2]],Right[t2]));
            }
            else {
                inp=Size[Left[t2]];
                Size [Left[t2]]+=Size[t2]+Size[Right[t2]];
                Right[Left[t2]] =Right[Right[t2]];
                Size[Right[t2]]+=Size[t2]+inp;
                Left[Right[t2]] =Left[Left[t2]];
                if(Left[Left[t2]] && Right[Left[t2]]) PQ.push(make_pair(Size[Left[t2]],Left[t2]));
            }
        }
    }
    printf("%d",Ans);
    return 0;
}
# Verdict Execution time Memory Grader output
1 Correct 0 ms 16840 KB Output is correct
2 Correct 0 ms 16840 KB Output is correct
3 Correct 0 ms 16840 KB Output is correct
4 Correct 0 ms 16840 KB Output is correct
5 Correct 0 ms 16840 KB Output is correct
6 Correct 1 ms 16840 KB Output is correct
7 Correct 0 ms 16840 KB Output is correct
8 Correct 0 ms 16840 KB Output is correct
9 Correct 0 ms 16840 KB Output is correct
10 Correct 18 ms 16840 KB Output is correct
11 Correct 15 ms 17612 KB Output is correct
12 Correct 21 ms 16840 KB Output is correct
13 Correct 76 ms 16840 KB Output is correct
14 Correct 178 ms 16840 KB Output is correct
15 Correct 150 ms 16840 KB Output is correct
16 Correct 147 ms 16840 KB Output is correct
17 Correct 147 ms 16840 KB Output is correct
18 Correct 237 ms 16840 KB Output is correct
19 Correct 161 ms 16840 KB Output is correct
20 Correct 107 ms 16840 KB Output is correct