Submission #338187

#	Time	Username	Problem	Language	Result	Execution time	Memory
338187		bigDuck	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	10 / 100	3 ms	1388 KiB

skyscraper

#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

int t, n, m, k, b[30010], p[30010];
int crd[30010];

int d[2010];
bool v[2010];
bool dog[2010];

vector<pii> g[30010];


bool ex[2010][2010];


void dijkstra(){
multiset<pii> ms;
ms.insert({d[crd[1] ], crd[1]});

while(!ms.empty()){
    auto f=*ms.begin(); ms.erase(ms.begin());
    int nod=f.sc;
    v[nod]=true;
    //cout<<nod<<"y\n";
    if(nod==crd[2]);

    for(auto pr:g[nod]){
        int u=pr.ft, c=pr.sc;
        if(v[u]){continue;}
        //cout<<u<<" "<<c<<"x\n";
        auto it=ms.find({d[u], u});
        if(it!=ms.end()){
            ms.erase(it);
            d[u]=min(d[u], d[nod]+c);
            ms.insert({d[u], u});
        }
        else{
                d[u]=d[nod]+c;
            ms.insert({d[u], u} );
        }
    }

}

return;
}




int32_t main(){
INIT
cin>>n>>m;
for(int i=1; i<=n; i++){d[i]=-1;}

for(int i=1; i<=m; i++){
cin>>b[i]>>p[i]; b[i]++;
    dog[b[i] ]=true;
}

for(int i=1; i<=m; i++){
        for(int j=b[i]-p[i]; j>=1; j-=p[i]){
        if((dog[j]) && (!ex[b[i] ][j]) ){
       // g[j].pb({b[i], abs(b[i]-j)/p[i] });
       ex[b[i] ][j ]=true;
        g[b[i] ].pb({j, abs(b[i]-j)/p[i] });}
    }
    for(int j=b[i]+p[i]; j<=n; j+=p[i]){
            if( (dog[j]) && (!ex[b[i] ][j]) ){
        //g[j].pb({b[i], abs(b[i]-j)/p[i] });
       ex[b[i] ][j ]=true;
        g[b[i] ].pb({j, abs(b[i]-j)/p[i] });}
    }
    crd[i ]=b[i];
}

d[crd[1] ]=0;

dijkstra();
cout<<d[crd[2] ];



return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43