Submission #310211

#	Time	Username	Problem	Language	Result	Execution time	Memory
310211		bigDuck	Climbers (RMI18_climbers)	C++14	50 / 100	1104 ms	122872 KiB

climbers

#include<bits/stdc++.h>
using namespace std;
#define INIT  ios_base :: sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define mp make_pair
#define pb push_back
#define ft first
#define sc second
#define ll long long
#define pii pair<int, int>
#define count_bits __builtin_popcount
//#define int ll

int n,h[5010];
int d[5010][5010];

multiset<pair<int, pii>> ms;
bool vr[5010][5010];


bool btwn(int p1, int p2, int p3){
return ( (h[p1]<=max(h[p2], h[p3])) && (h[p1]>=min(h[p2], h[p3]) )  );
}

void add_edge(int p, int l, int d0){
    if( ((l>=n) || (p<=0))|| (vr[p][l]==true) || (!btwn(p, l, l+1)) || (l<=0) || (p>n) ){return;}
    auto it=ms.find({d[p][l], {p, l} });
    if(it!=ms.end()){ms.erase(it); d[p][l]=min(d[p][l], d0); }
    else{d[p][l]=d0; }
    ms.insert({d[p][l], {p, l} });
}

void edges(int p, int l){


if( (h[p]==h[l]) ){
    add_edge(p, l-1, d[p][l]);
    if(btwn(p+1, l-1, l) ){
        add_edge(p+1, l-1, d[p][l]+abs(h[p+1]-h[p]) );
    }
    if(btwn(l-1, p, p+1)){
        add_edge(l-1, p, d[p][l]+abs(h[l-1]-h[p]));
    }
    if(btwn(p-1, l, l-1)){
        add_edge(p-1, l-1, d[p][l]+abs(h[p-1]-h[p]));
    }
    if(btwn(l-1, p-1, p) ){
        add_edge(l-1, p-1, d[p][l]+abs(h[l-1]-h[p]));
    }
}

if(h[p]==h[l+1]){
    if(btwn(p+1, l+1, l+2)){
        add_edge(p+1, l+1, d[p][l]+abs(h[p+1]-h[p]));
    }
    if(btwn(l+2, p, p+1)){
        add_edge(l+2, p, d[p][l]+abs(h[l+2]-h[p]));
    }
    if(btwn(p-1, l+1, l+2)){
        add_edge(p-1, l+1, d[p][l]+abs(h[p-1]-h[p]));
    }
    if(btwn(l+2, p, p-1)){
        add_edge(l+2, p-1, d[p][l]+abs(h[l+2]-h[p]));
    }
}


add_edge(p+1, l, d[p][l]+abs(h[p+1]-h[p]));
add_edge(l+1, p, d[p][l]+abs(h[l+1]-h[p]));
add_edge(l, p, d[p][l]+abs(h[l]-h[p]));
add_edge(p-1, l, d[p][l]+abs(h[p-1]-h[p]));
add_edge(l+1, p-1, d[p][l]+abs(h[l+1]-h[p]));
add_edge(l, p-1, d[p][l]+abs(h[l]-h[p]));
}



void dijkstra(){
d[n][1]=0;
ms.insert({0, {n, 1} } );
while(!ms.empty()){
    auto f=*ms.begin(); ms.erase(ms.begin());
    int x=f.sc.ft, y=f.sc.sc;
    d[x][y]=f.ft;
    vr[x][y]=true;
    edges(x, y);
}
return;
}




int32_t main(){
INIT
cin>>n;
for(int i=1; i<=n; i++){
    cin>>h[i];
    for(int j=1; j<=n;j++){
        d[i][j]=-1;
    }
}
dijkstra();
int res=1e9;
for(int i=1; i<=n; i++){
    if(d[i][i]!=-1){
        res=min(res, d[i][i]);
    }
}
cout<<res;

return 0;
}

• Subtask 1: 15 / 25
• Subtask 2: 25 / 25
• Subtask 3: 10 / 50