Submission #955011

#	Time	Username	Problem	Language	Result	Execution time	Memory
955011		BbtT	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	0 / 100	1 ms	604 KiB

skyscraper

#include<bits/stdc++.h>

using namespace std;

struct ed{
    int n,w;
};

bool operator<(ed a,ed b){
    return a.w<b.w;
}

int N,M,d[30005];
bitset<30005> vis;
vector<vector<ed>> edge;

int main(){

    cin>>N>>M;
    edge.resize(N);
    for(int i=0;i<M;i++){
        int b,p;
        scanf("%d%d",&b,&p);
        edge.push_back({});
        edge[b].push_back((ed){edge.size()-1,0});
        for(int j=b+p;j<N;j+=p){
            edge.back().push_back((ed){j,(j-b)/p});
        }
        for(int j=b-p;j>=0;j-=p){
            edge.back().push_back((ed){j,(b-j)/p});
        }
    }

    priority_queue<ed> Q;
    Q.push((ed){0,0});
    while(!Q.empty()){
        int cur=Q.top().n,wn=Q.top().w;
        Q.pop();
        vis[cur]=1;
        for(auto togo:edge[cur]){
            if(vis[togo.n])continue;
            if(d[togo.n]>wn+togo.w||d[togo.n]==0){
                d[togo.n]=wn+togo.w;
                Q.push((ed){togo.n,d[togo.n]});
            }
        }
    }cout<<d[1]<<endl;

    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:25:43: warning: narrowing conversion of '(edge.std::vector<std::vector<ed> >::size() - 1)' from 'std::vector<std::vector<ed> >::size_type' {aka 'long unsigned int'} to 'int' [-Wnarrowing]
   25 |         edge[b].push_back((ed){edge.size()-1,0});
      |                                ~~~~~~~~~~~^~
skyscraper.cpp:23:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         scanf("%d%d",&b,&p);
      |         ~~~~~^~~~~~~~~~~~~~

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