Submission #470668

#	Time	Username	Problem	Language	Result	Execution time	Memory
470668		robell	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	36 / 100	354 ms	180992 KiB

skyscraper

#pragma GCC optimize("O2")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef tree<int,null_type,less<int>,rb_tree_tag, tree_order_statistics_node_update> indexed_set;
typedef long long ll;
#define pb push_back
#define eb emplace_back
#define countbits __builtin_popcount
#define beg0 __builtin_clz
#define terminal0 __builtin_ctz
#define mod 1e9+7
void setIO(){
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
}
void setIO(string f){
	freopen((f+".in").c_str(),"r",stdin);
	freopen((f+".out").c_str(),"w",stdout);
	setIO();
}
int jmp[2020][2020];
int b[2020];
int p[2020];
int N, M;
vector<pair<int,int>> adj[2020][2020];
int main(){
	setIO();
	cin >> N >> M;
	for (int i=0;i<M;i++){
		cin >> b[i] >> p[i];
		for (int j=b[i]-p[i];j>=0;j-=p[i]){
			adj[j+p[i]][p[i]].pb({j,p[i]});
			adj[j+p[i]][p[i]].pb({j,2010});
		}
		for (int j=b[i]+p[i];j<N;j+=p[i]){
			adj[j-p[i]][p[i]].pb({j,p[i]});
			adj[j-p[i]][p[i]].pb({j,2010});
		}
		adj[b[i]][2010].pb({b[i],p[i]});
		adj[b[i]][p[i]].pb({b[i],2010});
	}
	memset(jmp,-1,sizeof(jmp));
	jmp[b[0]][2010]=0;
	jmp[b[0]][p[0]]=0;
	deque<pair<int,int>> q;
	q.push_back({b[0],p[0]});
	q.push_back({b[0],2010});
	while (!q.empty()){
		pair<int,int> n = q.front();
		q.pop_front();
		int c = 1;
		if (n.second==2010){
			c=0;
		}
		for (pair<int,int> s:adj[n.first][n.second]){
			if ((jmp[s.first][s.second]==-1)||(jmp[s.first][s.second]>jmp[s.first][s.second]+c)){
				jmp[s.first][s.second]=c+jmp[n.first][n.second];
				if (c==0){
					q.push_front({s.first,s.second});
				}else{
					q.push_back({s.first,s.second});
				}
			}
		}
	}
	cout << jmp[b[1]][p[1]] << "\n";
}

Compilation message (stderr)

skyscraper.cpp: In function 'void setIO(std::string)':
skyscraper.cpp:19:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |  freopen((f+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:20:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |  freopen((f+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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