#pragma GCC optimization "Ofast"
#pragma GCC optimization "unroll-loop"
#pragma GCC target ("avx2")
#include <bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
using namespace std;
const ll N = 3e4 + 6;
const ll Log2 = 19;
const ll inf = 1e9 + 7;
typedef pair<ll,ll> LL;
vector<LL> v;
struct doge{
ll pos,p,id;
};
doge a[N];
ll n,m,d[N];
map<LL,ll> mp;
vector<LL> g[N];
void Dij(){
fill(d,d + N - 3,inf);
set<LL> s; s.insert({0,a[1].pos}); d[a[1].pos] = 0;
while(!s.empty()){
LL t = *s.begin(); s.erase(s.begin());
ll u = t.sc;
for (auto i : g[u]){
ll v = i.fs,L = i.sc;
if (d[v] > d[u] + L){
s.erase({d[v],v});
d[v] = d[u] + L; s.insert({d[v],v});
}
}
}
if (d[a[2].pos] != inf) cout<<d[a[2].pos];
else cout<<-1;
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0), cout.tie(0);
#define task "test"
if (fopen(task".inp", "r")){
freopen(task".inp", "r", stdin);
//freopen(task".out", "w", stdout);
}
cin>>n>>m;
for (ll i = 1;i <= m;i++) cin>>a[i].pos>>a[i].p,a[i].pos++;
for (ll i = 1;i <= m;i++){
LL now = {a[i].pos,a[i].p};
if (mp[now]) continue; mp[now] = 1;
ll cost = 1;
for (ll j = now.fs + a[i].p;j <= n;j += a[i].p){
if (mp[{j,now.sc}]) break;
//mp[{j,now.sc}] = 1; //cout<<j<<" ";
g[now.fs].push_back({j,cost}),cost++;
}
cost = 1; //return 0;
for (ll j = now.fs - a[i].p;j > 0;j -= a[i].p){
if (mp[{j,now.sc}]) break;
//mp[{j,now.sc}] = 1;
g[now.fs].push_back({j,cost}),cost++;
//if (now.fs == 5) cout<<j<<" x ";
}
}
Dij();
}
Compilation message
skyscraper.cpp:1: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
1 | #pragma GCC optimization "Ofast"
|
skyscraper.cpp:2: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
2 | #pragma GCC optimization "unroll-loop"
|
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:54:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
54 | if (mp[now]) continue; mp[now] = 1;
| ^~
skyscraper.cpp:54:32: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
54 | if (mp[now]) continue; mp[now] = 1;
| ^~
skyscraper.cpp:47:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
47 | freopen(task".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
1100 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
1100 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
1100 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
1100 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
1100 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
