#include <bits/stdc++.h>
using namespace std;
#define int int64_t //be careful about this
#define pr pair
#define ar array
#define f first
#define s second
#define vt vector
#define pb push_back
#define eb emplace_back
#define lb lower_bound
#define ub upper_bound
#define SZ(x) ((int)(x).size())
#define all(a) (a).begin(),(a).end()
#define allr(a) (a).rbegin(),(a).rend()
#define mem(a,b) memset(a, b, sizeof(a))
template<class A> void rd(vt<A>& v);
template<class T> void rd(T& x){ cin >> x;}
template<class H, class... T> void rd(H& h, T&... t) { rd(h); rd(t...);}
template<class A> void rd(vt<A>& x) { for(auto& a : x) rd(a);}
template<class T> bool ckmin(T& a, const T b) { return b < a ? a = b, 1 : 0;}
template<class T> bool ckmax(T& a, const T b) { return a < b ? a = b, 1 : 0;}
template<typename T>
void __p(T a) {
cout<<a;
}
template<typename T, typename F>
void __p(pair<T, F> a) {
cout<<"{";
__p(a.first);
cout<<",";
__p(a.second);
cout<<"}\n";
}
template<typename T>
void __p(std::vector<T> a) {
cout<<"{";
for(auto it=a.begin(); it<a.end(); it++)
__p(*it),cout<<",}\n"[it+1==a.end()];
}
template<typename T, typename ...Arg>
void __p(T a1, Arg ...a) {
__p(a1);
__p(a...);
}
template<typename Arg1>
void __f(const char *name, Arg1 &&arg1) {
cout<<name<<" : ";
__p(arg1);
cout<<endl;
}
template<typename Arg1, typename ... Args>
void __f(const char *names, Arg1 &&arg1, Args &&... args) {
int bracket=0,i=0;
for(;; i++)
if(names[i]==','&&bracket==0)
break;
else if(names[i]=='(')
bracket++;
else if(names[i]==')')
bracket--;
const char *comma=names+i;
cout.write(names,comma-names)<<" : ";
__p(arg1);
cout<<" | ";
__f(comma+1,args...);
}
#define trace(...) cout<<"Line:"<<__LINE__<<" ", __f(#__VA_ARGS__, __VA_ARGS__)
void setIO(string s = "") {
ios_base::sync_with_stdio(0); cin.tie(0);
cout.precision(20); cout << fixed;
if(SZ(s)){
freopen((s+".in").c_str(),"r",stdin);
freopen((s+".out").c_str(),"w",stdout);
}
}
/*/--------------------------------------------------look below-----------------------------------------------------------------------------------/*/
const int inf = 1e9;
struct R{
int X1,Y1,X2,Y2,id;
};
signed main(){
setIO();
int FX,FY;
rd(FX,FY);
int n;
rd(n);
vt<R> rect(n);
for(int i = 0; i < n; ++i)
rect[i].id=i,rd(rect[i].X1,rect[i].Y1,rect[i].X2,rect[i].Y2);
rect.pb({FX,FY,FX,FY,n});
vt<int> nxtu(n+1,-1),nxtl(n+1,-1);
vt<ar<int,3>> events;
for(int i = 0; i <= n; ++i){
events.pb({rect[i].Y1-1,+1,rect[i].id});
events.pb({rect[i].Y2+1,-1,rect[i].id});
events.pb({rect[i].Y1,+2,rect[i].id});//activate
events.pb({rect[i].Y2,-2,rect[i].id});//deactivate.
}
sort(all(events),[&](auto l,auto r){
if(l[2] == r[2])
return l[1] > r[1];
return l[0] < r[0];
});
auto cmp = [&](int i,int j){
return rect[i].X2 < rect[j].X2;
};
set<int,decltype(cmp)> s(cmp);
for(auto [y,t,id] : events){
if(t == -1 || t == +1){
if(s.empty())
continue;
auto itr = s.lb(id);
if(itr != s.begin())
--itr;
else
continue;
if(t == -1)
nxtu[id] = *itr;
else
nxtl[id] = *itr;
}
if(t == +2){
s.insert(id);
}
if(t == -2){
s.erase(s.find(id));
}
}
// vt<int> id(n+1);
// iota(all(id),0);
// sort(all(id),[&](auto l,auto r){
// return rect[l].X2 < rect[r].X2;
// });
// int ans = inf;
// vt<int> disu(n+1,inf),disl(n+1,inf);
// for(auto i : id){
// if(rect[i].id == n){
// if(nxtu[rect[i].id] < 0)
// ckmin(ans,abs(rect[i].X2) + abs(rect[i].Y2));
// else{
// int nxt = nxtu[rect[i].id];
// ckmin(ans,disu[nxt] + abs(rect[i].X2-rect[nxt].X2) + abs(rect[i].Y2-(rect[nxt].Y2+1)));
// ckmin(ans,disl[nxt] + abs(rect[i].X2-rect[nxt].X2) + abs(rect[i].Y2-(rect[nxt].Y1-1)));
// }
// if(nxtl[rect[i].id] < 0)
// ckmin(ans,abs(rect[i].X2) + abs(rect[i].Y2));
// else{
// int nxt = nxtl[rect[i].id];
// ckmin(ans,disu[nxt] + abs(rect[i].X2-rect[nxt].X2) + abs(rect[i].Y2-(rect[nxt].Y2+1)));
// ckmin(ans,disl[nxt] + abs(rect[i].X2-rect[nxt].X2) + abs(rect[i].Y2-(rect[nxt].Y1-1)));
// }
// cout << ans;
// return 0;
// }
// if(nxtu[rect[i].id] < 0)
// disu[rect[i].id] = abs(rect[i].X2) + abs(rect[i].Y2+1);
// else{
// int nxt = nxtu[rect[i].id];
// ckmin(disu[rect[i].id],disu[nxt] + abs(rect[i].X2-rect[nxt].X2) + abs(rect[i].Y2-rect[nxt].Y2));
// ckmin(disu[rect[i].id],disl[nxt] + abs(rect[i].X2-rect[nxt].X2) + abs(rect[i].Y2+1-(rect[nxt].Y1-1)));
// }
// if(nxtl[rect[i].id] < 0)
// disl[rect[i].id] = abs(rect[i].X2) + abs(rect[i].Y1-1);
// else{
// int nxt = nxtl[rect[i].id];
// ckmin(disl[rect[i].id],disu[nxt] + abs(rect[i].X2-rect[nxt].X2) + abs(rect[i].Y1-1-(rect[nxt].Y2+1)));
// ckmin(disl[rect[i].id],disl[nxt] + abs(rect[i].X2-rect[nxt].X2) + abs(rect[i].Y1-rect[nxt].Y1));
// }
// }
return 0;
}
// tips to avoid bugs.
/*
* be careful of whats happening you dont want a continue statement to miss imp line of code.
* be careful when to update what since it might be needed in next segment of code.
* dont get stuck on one idea.
* dont use too much space bar so that code is written quickly as possible.
*/
Compilation message
walk.cpp: In function 'void setIO(std::string)':
walk.cpp:81:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
81 | freopen((s+".in").c_str(),"r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
walk.cpp:82:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
82 | freopen((s+".out").c_str(),"w",stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
1 ms |
460 KB |
Execution killed with signal 6 |
| 2 |
Incorrect |
0 ms |
204 KB |
Unexpected end of file - int64 expected |
| 3 |
Incorrect |
0 ms |
332 KB |
Unexpected end of file - int64 expected |
| 4 |
Runtime error |
2 ms |
1048 KB |
Execution killed with signal 6 |
| 5 |
Runtime error |
88 ms |
38672 KB |
Execution killed with signal 6 |
| 6 |
Runtime error |
26 ms |
12624 KB |
Execution killed with signal 11 |
| 7 |
Runtime error |
43 ms |
21916 KB |
Execution killed with signal 6 |
| 8 |
Runtime error |
88 ms |
43184 KB |
Execution killed with signal 6 |
| 9 |
Runtime error |
86 ms |
42528 KB |
Execution killed with signal 6 |
| 10 |
Runtime error |
84 ms |
42736 KB |
Execution killed with signal 11 |
