This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
/**
* 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);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
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