| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 249618 | LittleFlowers__ | Sky Walking (IOI19_walk) | C++17 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define in ({int x=0;int c=getchar(),n=0;for(;!isdigit(c);c=getchar()) n=(c=='-');for(;isdigit(c);c=getchar()) x=x*10+c-'0';n?-x:x;})
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r){return l+rng()%(r-l+1);}
#define fasty ios_base::sync_with_stdio(0),cin.tie(0);
#define forinc(a,b,c) for(int a=b,_c=c;a<=_c;++a)
#define fordec(a,b,c) for(int a=b,_c=c;a>=_c;--a)
#define forv(a,b) for(auto&a:b)
#define fi first
#define se second
#define pb push_back
#define ii pair<int,int>
#define mt make_tuple
#define all(a) a.begin(),a.end()
#define reset(f, x) memset(f, x, sizeof(f))
#define gg exit(0);
const long long INF=1e18+10;
const int N=100010;
long long f[N*3];
vector<int> val;
multiset<long long> up[N],dw[N];
vector<int> has[N];
void upd_u(int i,long long j,int t){
i=lower_bound(all(val),i)-val.begin()+1;
for(;i;i-=i&-i){
if(t) up[i].insert(j); else up[i].erase(up[i].find(j));
}
}
void upd_d(int i,long long j,int t){
i=lower_bound(all(val),i)-val.begin()+1;
for(;i<=val.size();i+=i&-i){
if(t) dw[i].insert(j); else dw[i].erase(dw[i].find(j));
}
}
long long que_u(int i){
i=lower_bound(all(val),i)-val.begin()+1;
long long ret=INF;
for(;i<=val.size();i+=i&-i) if(up[i].size())
ret=min(ret,*up[i].begin());
return ret;
}
long long que_d(int i){
i=lower_bound(all(val),i)-val.begin()+1;
long long ret=INF;
for(;i;i-=i&-i) if(dw[i].size())
ret=min(ret,*dw[i].begin());
return ret;
}
map<ii,int> mp;
vector<ii> ad[N*3];
int mask(int i,int h){
if(mp.count({i,h}))
return mp[{i,h}];
return mp[{i,h}]=mp.size();
}
void add(int i,int j,int c){
//cerr<<i<<" "<<j<<" "<<c<<"\n";
ad[i].pb({j,c});
ad[j].pb({i,c});
}
long long min_distance(vector<int> x,vector<int> h,vector<int> l,vector<int> r,vector<int> y,int s,int g){
if(s==0 && g==x.size()-1){
val=y, val.pb(0), sort(all(val)), val.erase(unique(all(val)),val.end());
vector<ii> q;
forinc(i,1,l.size()){
q.push_back({l[i-1],-i});
q.push_back({r[i-1],i});
}
q.push_back({0,l.size()+1});
q.push_back({0,-l.size()-1});
sort(all(q));
y.emplace_back();
x.push_back(x[0]);
l.push_back(0);
r.push_back(0);
long long ret=INF;
forv(i,q){
if(i.se<0){ i.se=-i.se;
i.se--;
f[i.se]=min(x[l[i.se]]+y[i.se]+que_d(y[i.se]),x[l[i.se]]-y[i.se]+que_u(y[i.se]));
if(i.se==l.size()-1) f[i.se]=0;
upd_d(y[i.se],f[i.se]-x[l[i.se]]-y[i.se],1);
upd_u(y[i.se],f[i.se]-x[l[i.se]]+y[i.se],1);
if(r[i.se]==x.size()-2)
ret=min(ret,f[i.se]+x[r[i.se]]-x[l[i.se]]+y[i.se]);
} else{
i.se--;
upd_d(y[i.se],f[i.se]-x[l[i.se]]-y[i.se],0);
upd_u(y[i.se],f[i.se]-x[l[i.se]]+y[i.se],0);
}
}
return ret==INF ? -1 : ret;
} else{
has[s].push_back(0);
has[g].push_back(0);
set<int> st;
vector<ii> el, q;
int n=x.size();
forinc(i,1,n){
st.insert(i-1);
el.push_back({h[i-1],i-1});
}
sort(all(el));
forinc(i,1,l.size()){
q.push_back({y[i-1],i-1});
}
sort(all(q));
int it=0;
forv(i,q){
while(el[it].fi<i.fi){
st.erase(el[it++].se);
}
auto j=st.lower_bound(l[i.se]);
int pre=-1;
for(;;){
has[*j].push_back(y[i.se]);
if(pre>=0)
add(mask(*j,y[i.se]),mask(pre,y[i.se]),x[*j]-x[pre]);
pre=*j;
if(*j==r[i.se]) break;
j++;
}
}
forinc(i,0,n-1){
sort(all(has[i]));
has[i].erase(unique(all(has[i])),has[i].end());
forinc(j,1,has[i].size()-1){
add(mask(i,has[i][j-1]),mask(i,has[i][j]),has[i][j]-has[i][j-1]);
}
}
//gg
using li=pair<long long,int>;
priority_queue<li,vector<li>,greater<li>> qq;
int ss=mask(s,0), ed=mask(g,0);
qq.push({0,ss});
reset(f,127);
f[ss]=0;
while(q.size()){
long long c=qq.top().fi; int u=qq.top().se; qq.pop();
if(u==ed) return c;
forv(v,ad[u]){
if(f[v.fi]>c+v.se){
f[v.fi]=c+v.se;
qq.push({c+v.se,v.fi});
}
}
}
return -1;
}
}
main(){
#define task "TASK"
if(fopen(task".inp","r")){
freopen(task".inp","r",stdin);
//freopen(task".out","w",stdout);
}
int n=in,m=in;
vector<int> x,h,l,r,y;
int s,q;
forinc(i,1,n){
x.pb(in), h.pb(in);
}
forinc(i,1,m){
l.pb(in), r.pb(in), y.pb(in);
}
s=in,q=in;
cout<<min_distance(x,h,l,r,y,s,q);
/**
cout<<min_distance({0, 4, 5, 6, 9},
{6, 6, 6, 6, 6},
{3, 1, 0},
{4, 3, 2},
{1, 3, 6},
0, 4);
*/
}