Submission #41702

#	Time	Username	Problem	Language	Result	Execution time	Memory
41702		Hassoony	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	870 ms	10684 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef double D;
const int inf=(1<<30);
const int MX=30009;
vector<int>v[MX];
int dis[MX],vis[MX];
int n,m,b,p,st,en;
int main(){
    scanf("%d%d",&n,&m);
    for(int i=0;i<m;i++){
        scanf("%d%d",&b,&p);
        v[b].push_back(p);
        if(i==0)st=b;
        if(i==1)en=b;
    }
    for(int i=0;i<n;i++)dis[i]=inf;
    dis[st]=0;
    priority_queue<pair<int,int> >pq;
    pq.push({0,st});
    while(!pq.empty()){
        int x=pq.top().second,c=-pq.top().first;pq.pop();
        if(vis[x])continue;
        vis[x]=1;
        for(auto pp:v[x]){
        //    cout<<pp<<endl;
            for(int i=1;i*pp+x<n;i++){
      //          cout<<i*pp+x<<" ";
                if(dis[i*pp+x]>c+i){
                    dis[i*pp+x]=c+i;
                    pq.push({-c-i,i*pp+x});
                }
            }
            for(int i=1;-i*pp+x>=0;i++){
                if(dis[-i*pp+x]>c+i){
                    dis[-i*pp+x]=c+i;
                    pq.push({-c-i,-i*pp+x});
                }
            }
        }
    }
    if(dis[en]==inf)puts("-1");
    else cout<<dis[en]<<endl;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:11:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
                        ^
skyscraper.cpp:13:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&b,&p);
                            ^

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