Submission #951352

#	Time	Username	Problem	Language	Result	Execution time	Memory
951352		qin	Sky Walking (IOI19_walk)	C++17	24 / 100	4086 ms	669796 KiB

walk

#include <bits/stdc++.h>
#define fi first
#define se second
#define ssize(x) int(x.size())
#define pn printf("\n")
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(), x.rend()
#define vv vector
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<int, ll> pil;
typedef pair<ll, int> pli;
int inf = 2e09; ll infll = 2e18; int mod = 119<<23|1;
ll min_distance(vv<int> x, vv<int> h, vv<int> l, vv<int> r, vv<int> y, int s, int e){
		int n = ssize(x), m = ssize(y); 
		vv<set<int>> beg(n), ed(n);
		for(int i = 0; i < m; ++i) beg[l[i]].emplace(y[i]), ed[r[i]].emplace(y[i]);
		for(int i = 0; i < n; ++i){
				vv<int> to_remove;
				for(int u : beg[i]){
						auto it = lower_bound(all(ed[i]), u);
						if(it != ed[i].end() && *it == u) to_remove.emplace_back(u);
				}
				for(int u : to_remove) beg[i].erase(u), ed[i].erase(u);
		}
		
		set<int> active;
		vv<vv<pii>> g(1);
		int cnt = 0;
		map<pii, int> mp;
		int a = -1, b = -1;
		for(int i = 0; i < n; ++i){
				vv<pii> nr;
				if(i == s || i == e){
						nr.emplace_back(++cnt, 0), g.emplace_back(vv<pii>());
						if(a == -1) a = cnt;
						else b = cnt;
						mp[pii(i, 0)] = cnt;
				}
				
				for(int u : beg[i]) active.emplace(u);
				for(int u : active){
						if(u > h[i]) break;
						mp[pii(i, u)] = ++cnt, nr.emplace_back(cnt, u), g.emplace_back(vv<pii>());
				}
				for(int u : ed[i]) active.erase(u);
				//~ printf("%d:\n", i);
				for(int j = 0; j < ssize(nr)-1; ++j) g[nr[j].fi].emplace_back(nr[j+1].fi, abs(nr[j].se-nr[j+1].se)), g[nr[j+1].fi].emplace_back(nr[j].fi, abs(nr[j].se-nr[j+1].se));
				//~ pn;
		}
		map<int, int> last;
		for(int i = 0; i < n; ++i){
				//~ printf("%d:\n", i);
				for(int u : active){
						if(u > h[i]) break;
						//~ printf("%d %d, ", u, abs(x[last[u]]-x[i]));
						g[mp[pii(i, u)]].emplace_back(mp[pii(last[u], u)], abs(x[last[u]]-x[i])), g[mp[pii(last[u], u)]].emplace_back(mp[pii(i, u)], abs(x[last[u]]-x[i]));
						last[u] = i;
				}
				//~ pn;
				for(int u : beg[i]) active.emplace(u), last[u] = i;
				for(int u : ed[i]) active.erase(u), last[u] = 0;
		}
		n = ssize(g)-1;
		vv<ll> dist(n+1, infll);
		dist[a] = 0; priority_queue<pli> pq; pq.emplace(0, a);
		while(ssize(pq)){
				int X = pq.top().se; ll d = -pq.top().fi; pq.pop();
				if(dist[X] != d) continue;
				for(pii u : g[X])
						if(d+u.se < dist[u.fi])
								dist[u.fi] = d+u.se, pq.emplace(-dist[u.fi], u.fi);
		}
		if(dist[b] == infll) return -1;
		else return dist[b];
		return 0;
}
#ifdef LOCAL
signed main(){
		int T = 1;
		for(++T; --T; ){
				int n, m, s, g; scanf("%d%d", &n, &m);
				vv<int> x(n), h(n), l(m), r(m), y(m);
				for(int i = 0; i < n; ++i) scanf("%d", &x[i]);
				for(int i = 0; i < n; ++i) scanf("%d", &h[i]);
				for(int i = 0; i < m; ++i) scanf("%d", &l[i]);
				for(int i = 0; i < m; ++i) scanf("%d", &r[i]);
				for(int i = 0; i < m; ++i) scanf("%d", &y[i]);
				scanf("%d%d", &s, &g);
				ll result = min_distance(x, h, l, r, y, s, g);
				printf("%lld\n", result);
		}
		return 0;
}
#endif

• Subtask 1: 10 / 10
• Subtask 2: 14 / 14
• Subtask 3: 0 / 15
• Subtask 4: 0 / 18
• Subtask 5: 0 / 43