Submission #470129

#	Time	Username	Problem	Language	Result	Execution time	Memory
470129		robell	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	10 / 100	1097 ms	38660 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
int 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 N, M;
vector<vector<int>> l;
vector<pair<int,int>> m;
vector<set<int>> pos;
int main(){
	setIO();
	cin >> N >> M;
	for (int i=0;i<N;i++) l.pb(vector<int>());
	for (int i=0;i<M;i++){
		int pos; cin >> pos;
		int moves; cin >> moves;
		m.pb({pos,moves});
	}
	int dp[M][N];
	for (int i=0;i<M;i++){
		for (int j=0;j<N;j++){
			dp[i][j]=1e9;
		}
	}
	queue<pair<pair<int,int>,pair<int,int>>> q;
	q.push({{m[0].first,m[0].second},{0,0}});
	while (!q.empty()){
		int pos=q.front().first.first;
		int jmp = q.front().first.second;
		int dist = q.front().second.first;
		int ind = q.front().second.second;
		q.pop();
		if (dp[ind][pos]<dist) continue;
		dp[ind][pos]=dist;
		if (pos+jmp<N){
			if (dp[ind][pos+jmp]>dist+1) q.push({{pos+jmp,jmp},{dist+1,ind}});
		}
		if (pos-jmp>=0){
			if (dp[ind][pos-jmp]>dist+1) q.push({{pos-jmp,jmp},{dist+1,ind}});
		}
		for (int i=0;i<M;i++){
			if (i==ind) continue;
			if (m[i].first==pos){
				if (dp[i][pos]>dist){
					q.push({{pos,m[i].second},{dist,i}});
				}
			}
		}
	}
	int totmin = 1e9;
	for (int i=0;i<N;i++){
		totmin=min(totmin,dp[1][i]);
	}
	cout << (totmin==1e9?-1:totmin) << "\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: 0 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43