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;
#define endl '\n'
void solve(){
int n,m;
cin>>n>>m;
vector<vector<int>> adj(n+1);
vector<pair<int,int>> v(m);
int pos = 0;
for(int i=0;i<m;i++){
int a,b;cin>>a>>b;
v[i].first = a;
v[i].second = b;
if(i == 1) pos = a;
adj[a].push_back(i);
}
queue<pair<int,int>> q;
vector<vector<bool>> vis(n,vector<bool>(m));
q.push({v[0].first,0});
vector<vector<int>> dis(n,vector<int>(m,0));
while(q.size()){
pair<int,int> cur = q.front(); q.pop();
for(auto ch : adj[cur.first]){
int p = v[ch].second;
if(cur.first+p<n && !vis[cur.first+p][ch]){
q.push({cur.first+p,ch});
dis[cur.first+p][ch] = dis[cur.first][cur.second] + 1;
vis[cur.first+p][ch] = 1;
}
if(cur.first-p>=0 && !vis[cur.first-p][ch]){
q.push({cur.first-p,ch});
dis[cur.first-p][ch] = dis[cur.first][cur.second] + 1;
vis[cur.first-p][ch] = 1;
}
}
int p = v[cur.second].second;
if(cur.first+p<n && !vis[cur.first+p][cur.second]){
q.push({cur.first+p,cur.second});
dis[cur.first+p][cur.second] = dis[cur.first][cur.second] + 1;
vis[cur.first+p][cur.second] = 1;
}
if(cur.first-p>=0 && !vis[cur.first-p][cur.second]){
q.push({cur.first-p,cur.second});
dis[cur.first-p][cur.second] = dis[cur.first][cur.second] + 1;
vis[cur.first-p][cur.second] = 1;
}
}
if(v[0].first == v[1].first){
cout<<0<<endl;
}
else {
int ans = 1e9;
for(int i=0;i<m;i++){
if(i == 1) continue;
if(dis[v[1].first][i] == 0) continue;
ans = min(ans,dis[v[1].first][i]);
}
cout<<(ans==1e9?-1:ans)<<endl;
}
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int t=1;
// cin>>t;
while(t--){
solve();
}
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
skyscraper.cpp: In function 'void solve()':
skyscraper.cpp:11:9: warning: variable 'pos' set but not used [-Wunused-but-set-variable]
11 | int pos = 0;
| ^~~
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