Submission #205574

#	Time	Username	Problem	Language	Result	Execution time	Memory
205574		kshitij_sodani	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	22 / 100	556 ms	262152 KiB

skyscraper

#include <iostream>
#include <bits/stdc++.h>
 
using namespace std;
typedef int64_t llo;
#define mp make_pair
#define pb push_back
#define a first
#define b second
#define endl "\n"
 
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	llo n,m;
	cin>>n>>m;
	llo b[m];
	llo p[m];
	//map<pair<llo,llo>,llo> aa;
	vector<pair<llo,llo>> adj[n][m+1];
	vector<llo> vv[n];
	for(llo i=0;i<m;i++){
		cin>>b[i]>>p[i];
		for(llo j=b[i]-p[i];j>=0;j=j-p[i]){
			adj[j+p[i]][i].pb(mp(j,i));
			adj[j+p[i]][i].pb(mp(j,m));
		}
		for(llo j=b[i]+p[i];j<n;j=j+p[i]){
			adj[j-p[i]][i].pb(mp(j,i));
			adj[j-p[i]][i].pb(mp(j,m));
		}
		adj[b[i]][m].pb(mp(b[i],i));
	}



	llo dis[n][m+1];
	memset(dis,-1,sizeof(dis));
	dis[b[0]][m]=0;
	dis[b[0]][0]=0;
	deque<pair<llo,pair<llo,llo>>> aaa;
	aaa.push_back(mp(0,mp(b[0],0)));
	aaa.push_back(mp(0,mp(b[0],m)));
	while(aaa.size()>0){
		pair<llo,pair<llo,llo>> x=aaa.front();
		aaa.pop_front();
		x.a=-x.a;
		llo co=1;
		if(x.b.b==m){
			co=0;
		}
		for(llo j=0;j<(llo)adj[x.b.a][x.b.b].size();j++){
			pair<llo,llo> nn=adj[x.b.a][x.b.b][j];
			if(dis[nn.a][nn.b]>x.a+co or dis[nn.a][nn.b]==-1){

				dis[nn.a][nn.b]=dis[x.b.a][x.b.b]+co;
				if(co==0){
					aaa.push_front(mp(-dis[nn.a][nn.b],nn));
				}
				else{
					aaa.push_back(mp(-dis[nn.a][nn.b],nn));
				}
			}
		}
	}
	if(b[0]==b[1]){
		cout<<0<<endl;
		return 0;
	}

	cout<<dis[b[1]][m]<<endl;




	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43