Submission #73641

#	Time	Username	Problem	Language	Result	Execution time	Memory
73641		Vardanyan	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	5 ms	1328 KiB

skyscraper

//#pragma GCC optimize "-O3"
#include <bits/stdc++.h>
using namespace std;
const int N = 30007;
vector<pair<int,int> > g[N];
int B[N],P[N];
int dist[N];
int main()
{
    int n,m;
    scanf("%d%d",&n,&m);
    for(int i = 0;i<m;i++){
        int b,p;
        scanf("%d%d",&b,&p);
        int bb = b;
        int c = 1;
        while(bb+p<n){
            bb+=p;
            g[b].push_back({bb,c});
            c++;
        }
        bb = b;
        c = 1;
        while(bb-p>=0){
            bb-=p;
            g[b].push_back({bb,c});
            c++;
        }
    }
    priority_queue<pair<int,int> > pq;
    dist[0] = 0;
    for(int i = 1;i<=n;i++) dist[i] = 1000*1000*1000+7;
    pq.push({0,0});
    while(!pq.empty()){
        pair<int,int> v = pq.top();
        pq.pop();
        int gag = v.second;
        for(int i = 0;i<g[gag].size();i++){
            int to = g[gag][i].first;
            int d = g[gag][i].second;
            if(d+(-v.first)<dist[to]){
                dist[to] = d+(-v.first);
                pq.push({-dist[to],to});
            }
        }
    }
    cout<<dist[1]<<endl;
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:38:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i = 0;i<g[gag].size();i++){
                       ~^~~~~~~~~~~~~~
skyscraper.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:14:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         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