Submission #27346

#	Time	Username	Problem	Language	Result	Execution time	Memory
27346		TAMREF	Jakarta Skyscrapers (APIO15_skyscraper)	C++11	57 / 100	1000 ms	4524 KiB

skyscraper

#include <bits/stdc++.h>
#define va first
#define vb second
#define mp make_pair
#define all(x) x.begin(),x.end()
using namespace std;
typedef pair<int,int> pii;
const int mx=30005;
int dist[mx];
pii doge[mx];
vector<int> C[mx];
int N,M;
void input(){
    scanf("%d%d",&N,&M);
    for(int i=0;i<M;i++){
        scanf("%d%d",&doge[i].va,&doge[i].vb);
        C[doge[i].va].push_back(doge[i].vb);
    }
    for(int i=0;i<N;i++)
        sort(all(C[i]),greater<int>());
    fill(dist,dist+N,(int)1e9);
}
void dijk(int s){
    priority_queue<pii,vector<pii>,greater<pii>> q;
    q.push(mp(dist[s]=0,s));
    pii t;
    int vis[mx];
    while(!q.empty()){
        t=q.top(); q.pop();
        if(t.va>dist[t.vb]) continue;
        for(int i=0;i<N;i++) vis[i]=0;
        for(int p : C[t.vb]){
            for(int x=t.vb+p;x<N;x+=p){
                if(!C[x].size()||vis[x]) continue;
                vis[x]=1;
                if(binary_search(all(C[x]),p)){
                    if(dist[x]>=t.va+(x-t.vb)/p){
                        q.push(mp(dist[x]=t.va+(x-t.vb)/p,x));
                        break;
                    }
                }
                if(dist[x]>=t.va+(x-t.vb)/p)
                    q.push(mp(dist[x]=t.va+(x-t.vb)/p,x));
            }
            for(int x=t.vb-p;x>=0;x-=p){
                if(!C[x].size()||vis[x]) continue;
                vis[x]=1;
                if(binary_search(all(C[x]),p)){
                    if(dist[x]>=t.va+(t.vb-x)/p){
                        q.push(mp(dist[x]=t.va+(t.vb-x)/p,x));
                        break;
                    }
                }
                if(dist[x]>=t.va+(t.vb-x)/p)
                    q.push(mp(dist[x]=t.va+(t.vb-x)/p,x));
            }
        }
    }
}
int main(){
    input();
    dijk(doge[0].va);
    printf("%d\n",dist[doge[1].va]==(int)1e9?-1:dist[doge[1].va]);
}

Compilation message (stderr)

skyscraper.cpp: In function 'void input()':
skyscraper.cpp:14:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&N,&M);
                        ^
skyscraper.cpp:16:46: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&doge[i].va,&doge[i].vb);
                                              ^

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