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Submission #200973

# Submission time Handle Problem Language Result Execution time Memory
200973 2020-02-08T21:54:10 Z DavidDamian Crocodile's Underground City (IOI11_crocodile) C++11
100 / 100
 710 ms 50424 KB 
#include "crocodile.h"
#include<bits/stdc++.h>
using namespace std;
struct node
{
    int data;
    int key;
};
node A[1000005];
int heapSize=0;
int leftNode(int i)
{
    return i*2;
}
int rightNode(int i)
{
    return i*2+1;
}
int parent(int i)
{
    return i/2;
}
void minHeapify(int i)
{
    int L=leftNode(i);
    int R=rightNode(i);
    int best;
    if(L<=heapSize && A[L].key<A[i].key)
        best=L;
    else
        best=i;
    if(R<=heapSize && A[R].key<A[best].key)
        best=R;
    if(best!=i){
        swap(A[i],A[best]);
        minHeapify(best);
    }
}
void decreaseKey(int i,int key)
{
    if(A[i].key<key) return;
    A[i].key=key;
    while(i>1 && A[i].key<A[parent(i)].key){
        swap(A[i],A[parent(i)]);
        i=parent(i);
    }
}
void heapInsert(node x)
{
    A[++heapSize]=x;
    A[heapSize].key=1000000007;
    decreaseKey(heapSize,x.key);
}
node extractMin()
{
    node minimum=A[1];
    A[1]=A[heapSize--];
    minHeapify(1);
    return minimum;
}
struct edge
{
    int to;
    int w;
};
vector<edge> adjList[100005];
int entrances[100005];
int color[100005];
int d[100005][2]; //0 is primary distance (shortest path),
//1 is secondary distance (second shortest path)
#define debug(x) cout<<#x<<" = "<<x<<endl
#define INF 1000000007
void relax(int u,int v,int w)
{
    if(d[u][1]+w<d[v][0]){
        d[v][1]=d[v][0];
        d[v][0]=d[u][1]+w;
        node x={v,d[v][1]};
        heapInsert(x);
    }
    else if(d[u][1]+w<d[v][1]){
        d[v][1]=d[u][1]+w;
        node x={v,d[v][1]};
        heapInsert(x);
    }
}
int dijkstra(int n,int k,int p[])
{
    for(int i=0;i<n;i++){
        d[i][0]=d[i][1]=INF;
    }
    for(int i=0;i<k;i++){
        int u=p[i];
        d[u][0]=d[u][1]=0;
        node x={u,0};
        heapInsert(x);
    }
    while(heapSize){
        node x=extractMin();
        int u=x.data;
        if(color[u]==1) continue;
        color[u]=1;
        for(edge e: adjList[u]){
            int v=e.to;
            relax(u,v,e.w);
        }
    }
    return d[0][1]; //Secondary distance of node 0 (second best)
}
int travel_plan(int N, int M, int R[][2], int L[], int K, int P[])
{
    for(int i=0;i<M;i++){
        int u=R[i][0];
        int v=R[i][1];
        edge e={v,L[i]};
        adjList[u].push_back(e);
        e.to=u;
        adjList[v].push_back(e);
    }
    return dijkstra(N,K,P);
}

Subtask #1
46.0 / 46.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 2680 KB Output is correct
2 Correct 6 ms 2680 KB Output is correct
3 Correct 6 ms 2680 KB Output is correct
4 Correct 7 ms 2808 KB Output is correct
5 Correct 7 ms 2808 KB Output is correct
6 Correct 6 ms 2808 KB Output is correct
7 Correct 7 ms 2808 KB Output is correct
8 Correct 6 ms 2808 KB Output is correct

Subtask #2
43.0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 2680 KB Output is correct
2 Correct 6 ms 2680 KB Output is correct
3 Correct 6 ms 2680 KB Output is correct
4 Correct 7 ms 2808 KB Output is correct
5 Correct 7 ms 2808 KB Output is correct
6 Correct 6 ms 2808 KB Output is correct
7 Correct 7 ms 2808 KB Output is correct
8 Correct 6 ms 2808 KB Output is correct
9 Correct 8 ms 2940 KB Output is correct
10 Correct 6 ms 2680 KB Output is correct
11 Correct 7 ms 2812 KB Output is correct
12 Correct 10 ms 3192 KB Output is correct
13 Correct 10 ms 3192 KB Output is correct
14 Correct 7 ms 2680 KB Output is correct
15 Correct 7 ms 2808 KB Output is correct

Subtask #3
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 2680 KB Output is correct
2 Correct 6 ms 2680 KB Output is correct
3 Correct 6 ms 2680 KB Output is correct
4 Correct 7 ms 2808 KB Output is correct
5 Correct 7 ms 2808 KB Output is correct
6 Correct 6 ms 2808 KB Output is correct
7 Correct 7 ms 2808 KB Output is correct
8 Correct 6 ms 2808 KB Output is correct
9 Correct 8 ms 2940 KB Output is correct
10 Correct 6 ms 2680 KB Output is correct
11 Correct 7 ms 2812 KB Output is correct
12 Correct 10 ms 3192 KB Output is correct
13 Correct 10 ms 3192 KB Output is correct
14 Correct 7 ms 2680 KB Output is correct
15 Correct 7 ms 2808 KB Output is correct
16 Correct 550 ms 46328 KB Output is correct
17 Correct 102 ms 14968 KB Output is correct
18 Correct 126 ms 16504 KB Output is correct
19 Correct 710 ms 50424 KB Output is correct
20 Correct 339 ms 41604 KB Output is correct
21 Correct 52 ms 8056 KB Output is correct
22 Correct 374 ms 37112 KB Output is correct