Submission #896556

#	Time	Username	Problem	Language	Result	Execution time	Memory
896556		AgentPengin	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	100 / 100	261 ms	112720 KiB

skyscraper

/**
 *    author:  AgentPengin ( Độc cô cầu bại )
 *    created: 23.12.2022 10:08:02
 *    too lazy to update time
**/
#include<bits/stdc++.h>

#define EL '\n'
#define fi first
#define se second
#define NAME "TASK"
#define ll long long
#define lcm(a,b) (a/gcd(a,b))*b
#define db(val) "["#val" = " << (val) << "] "
#define bend(v) (v).begin(),(v).end()
#define sz(v) (int)(v).size()
#define ex exit(0)
#define visit __visit
using namespace std;

const ll mod = 1e9 + 7;
const int inf = 0x1FFFFFFF;
const int MAXN = 30005;

int n,m,pw[MAXN],pos[MAXN];
vector<int> adj[MAXN];
bitset<MAXN> visit[MAXN];



signed main() {
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    if (ifstream(NAME".inp")) {
        freopen(NAME".inp","r",stdin);
        freopen(NAME".out","w",stdout);
    }
    cin >> n >> m;
    for (int i = 1;i <= m;i++) {
    	cin >> pos[i] >> pw[i];
    	adj[pos[i]].push_back(pw[i]);
    }
    queue<tuple<int,int,int>> q;
    q.push({pos[1],pw[1],0});
    int ans = -1;
    while(!q.empty()) {
    	int u,p,d;
    	tie(u,p,d) = q.front();
    	q.pop();
    	if (u == pos[2]) {
    		ans = d;
    		break;
    	}
    	if (u - p >= 0 && !visit[u - p][p]) {
    		visit[u - p][p] = 1;
    		q.push({u - p,p, d + 1});
    	} 
    	if (u + p < n && !visit[u + p][p]) {
    		visit[u + p][p] = 1;
    		q.push({u + p,p,d + 1});
    	}
    	for (int p : adj[u]) {
    		visit[u][p] = 1;
    		if (u - p >= 0 && !visit[u - p][p]) {
    			visit[u - p][p] = 1;
    			q.push({u - p,p,d + 1});
    		}
    		if (u + p < n && !visit[u + p][p]) {
    			visit[u + p][p] = 1;
    			q.push({u + p,p,d + 1});
    		}
    	}
    }
    cout << ans;
    
    
    cerr << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
    return 0;
}
// agent pengin wants to take apio (with anya-san)

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:34:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |         freopen(NAME".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:35:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |         freopen(NAME".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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