Submission #250357

#	Time	Username	Problem	Language	Result	Execution time	Memory
250357		Marlov	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	1 ms	1152 KiB

skyscraper

/*
Code by @marlov       
*/
#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <vector>
#include <string>
#include <cmath>
#include <algorithm>
#include <iomanip>
#include <utility>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <stack>
#include <queue>
#include <iterator>
using namespace std;
typedef long long ll;
typedef pair<int,int> pi;

#define INF 200000000
#define maxV 30005

int N,M;
pair<int,int> doge[maxV];
int dist[maxV];
vector<int> sat[maxV];
bool visited[maxV];

int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
    cin>>N>>M;
    for(int i=0;i<M;i++){
        cin>>doge[i].first>>doge[i].second;
        dist[i]=INF;
        sat[doge[i].first].push_back(i);
    }
    priority_queue< pair<int,int> > pq;
    dist[0]=0;
    pq.push(make_pair(0,0));
    while(!pq.empty()){
        int cd=pq.top().first;
        int ci=pq.top().second;
        pq.pop();
        if(visited[ci]) continue;
        for(int i=doge[ci].first-doge[ci].second;i>=0;i-=doge[ci].second){
            if(sat[i].size()>0){
                for(int j=0;j<sat[i].size();j++){
                    if(!visited[sat[i][j]]&&dist[sat[i][j]]>dist[ci]+((doge[ci].first-i)/doge[ci].second)){
                        dist[sat[i][j]]=dist[ci]+((doge[ci].first-i)/doge[ci].second);
                        pq.push( make_pair(cd+(i-doge[ci].first),sat[i][j]));
                    }
                }
            }
        }
        for(int i=doge[ci].first+doge[ci].second;i<N;i+=doge[ci].second){
            if(sat[i].size()>0){
                for(int j=0;j<sat[i].size();j++){
                    if(!visited[sat[i][j]]&&dist[sat[i][j]]>dist[ci]+((i-doge[ci].first)/doge[ci].second)){
                        dist[sat[i][j]]=dist[ci]+((i-doge[ci].first)/doge[ci].second);
                        pq.push( make_pair(cd+(doge[ci].first-i),sat[i][j]));
                    }
                }
            }
        }
    }
    cout<<dist[1]<<'\n';
    return 0;
}

/* stuff you should look for
	* int overflow, array bounds
	* special cases (n=1,n=0?)
	* do smth instead of nothing and stay organized
*/

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:52:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for(int j=0;j<sat[i].size();j++){
                             ~^~~~~~~~~~~~~~
skyscraper.cpp:62:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for(int j=0;j<sat[i].size();j++){
                             ~^~~~~~~~~~~~~~

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