이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 30001;
vector<pair<int,int> >v[N];
int b[N] , p[N] ;
vector<pair<int,int> >vp;
int n , m ;
map<pair<int,int> , int>mp;
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int x , y;
cin>> n>> m ;
for(int i = 0 ; i < m ; i++)
{
cin >> b[i] >> p[i];
if(i==0)x=b[i];
if(i==1)y=b[i];
mp[{b[i],p[i]}]++;
if(mp[{b[i],p[i]}]>1)continue;
vp.push_back({b[i], p[i]});
}
if(x==y)
{
cout << 0 ;
return 0;
}
sort(vp.begin(),vp.end());
for(int i = 0 ; i < m ; i++)
{
int c=1;
for(int j = vp[i].first+vp[i].second ; j< n ; j+= vp[i].second)
{
v[vp[i].first].push_back({j , c});
c++;
if(mp[{j,vp[i].second}])
break;
}
}
for(int i = m-1 ; i >=0 ; i--)
{
int c=1;
for(int j = vp[i].first-vp[i].second ; j>=0 ; j-= vp[i].second)
{
v[vp[i].first].push_back({j , c});
c++;
if(mp[{j,vp[i].second}])
break;
}
}
int dist[N];
priority_queue<pair<int,int> >q;
int processed[N]={0};
for (int i = 0; i <= n; i++) dist[i] = INT_MAX;
dist[x] = 0;
q.push({0,x});
while (!q.empty())
{
int a = q.top().second; q.pop();
if (processed[a]) continue;
processed[a] = 1;
//cout << a << " : " ;
for (auto u : v[a])
{
int b = u.first, w = u.second;
// cout << b << " ";
if (dist[a]+w < dist[b])
{
dist[b] = dist[a]+w;
q.push({-dist[b],b});
}
}
//cout << "\n";
}
if(dist[y]==INT_MAX)
dist[y]=-1;
cout << dist[y] ;
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:58:13: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
58 | dist[x] = 0;
| ~~~~~~~~^~~
skyscraper.cpp:79:16: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
79 | dist[y]=-1;
| ~~~~~~~^~~
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