Submission #705517

#	Time	Username	Problem	Language	Result	Execution time	Memory
705517		Alihan_8	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	22 / 100	2 ms	3412 KiB

skyscraper

#include <bits/stdc++.h>
// include <ext/pb_ds/assoc_container.hpp>
// include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
#define all(x) x.begin(), x.end()
#define pb push_back
// define ordered_set tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>
#define mpr make_pair
#define ln '\n'
void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
#define int long long
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n, m; cin >> n >> m;
    vector <int> g[n];
    const int N = 2e3+1;
    vector <vector<int>> dis(n, vector <int> (N, -1));
    queue <pair<int,int>> q;
    int en = -1;
    for ( int i = 1; i <= m; i++ ){
        int pos, val; cin >> pos >> val;
        if ( i == 1 ){
            dis[pos][val] = 0;
            q.push({pos, val});
        }
        if ( i == 2 ) en = pos;
        g[pos].pb(val);
    }
    for ( auto i: g[0] ){
        dis[0][i] = 0;
        q.push({0, i});
    }
    while ( !q.empty() ){
        auto [cur, val] = q.front();
        q.pop();
        if ( cur == en ){
            cout << dis[cur][val] << ln;
            return 0;
        }
        for ( auto sign: {-1, 1} ){
            int to = cur-val*sign;
            if ( to >= 0 and to < n ){
                if ( dis[to][val] == -1 ){
                    dis[to][val] = dis[cur][val]+1;
                    q.push({to, val});
                }
                for ( auto w: g[to] ){
                    if ( dis[to][w] != -1 ) continue;
                    dis[to][w] = dis[cur][val]+1;
                    q.push({to, w});
                }
            }
        }
    }
    cout << "-1";

    cout << '\n';
}
/*
5 3
0 2
1 1
4 1
*/

Compilation message (stderr)

skyscraper.cpp: In function 'void IO(std::string)':
skyscraper.cpp:11:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:11:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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