제출 #1035912

#제출 시각아이디문제언어결과실행 시간메모리
1035912DucNguyen2007Jakarta Skyscrapers (APIO15_skyscraper)C++14
100 / 100
555 ms77908 KiB
#include<bits/stdc++.h> using namespace std; #define ll long long #define ld long double #define pii pair<int,int> #define pll pair<ll,ll> #define fi first #define se second const int maxN=3e4+5,BLOCK=305; const ll inf=2e18; int n,m,b[maxN+1],p[maxN+1]; ll d[maxN+1][BLOCK+1]; bool vis[maxN+1],ck[maxN+1]; struct duongdi { int u,power; ll w; bool operator < (const duongdi &o)const { return w>o.w; } }; vector<duongdi> adj[maxN+1]; priority_queue<duongdi> pq; vector<int> vec[maxN+1]; void CO(int u,int v,int pw,int power,int w) { if(d[v][pw]>d[u][power]+w) { d[v][pw]=d[u][power]+w; pq.push({v,pw,d[v][pw]}); } } int main() { //freopen("","r",stdin); //freopen("","w",stdout); ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); cin>>n>>m; memset(vis,false,sizeof(vis)); for(int i=0;i<m;i++) { cin>>b[i]>>p[i]; if(p[i]<=BLOCK) { vec[b[i]].push_back(p[i]); } else vis[b[i]]=true; ck[b[i]]=true; } for(int i=0;i<m;i++) { if(p[i]<=BLOCK) { continue; } for(int j=b[i]+p[i];j<n;j+=p[i]) { if(ck[j]) { adj[b[i]].push_back({j,0,(j-b[i])/p[i]}); } } for(int j=b[i]-p[i];j>=0;j-=p[i]) { if(ck[j]) { adj[b[i]].push_back({j,0,(b[i]-j)/p[i]}); } } } for(int i=0;i<n;i++) { for(int j=0;j<=BLOCK;j++) { d[i][j]=inf; } } if(p[0]<=BLOCK) { d[b[0]][p[0]]=0; pq.push({b[0],p[0],0}); } else { d[b[0]][0]=0; pq.push({b[0],0,0}); } while(!pq.empty()) { duongdi tmp=pq.top(); pq.pop(); int u=tmp.u,power=tmp.power; ll w=tmp.w; //cout<<u<<" "<<power<<" "<<w<<'\n'; if(u==b[1]) { cout<<d[u][power]; return 0; } if(d[u][power]<w) { continue; } if(power>0) { if(u+power<n) { CO(u,u+power,power,power,1); } if(u-power>=0) { CO(u,u-power,power,power,1); } if(vis[u]) { CO(u,u,0,power,0); } } else { for(auto i:adj[u]) { CO(u,i.u,0,power,i.w); } } for(auto i:vec[u]) { CO(u,u,i,power,0); } } cout<<-1; }
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