#include<bits/stdc++.h>
#define lf double
#define ll long long
#define cc pair<char,char>
#define ull unsigned ll
#define ii pair<int,int>
#define li pair<ll,int>
#define iii pair<ii,int>
#define iiii pair<ii,ii>
#define iiii2 pair<int,iii>
#define lii pair<ll,ii>
#define lolo pair<ll,ll>
#define heap priority_queue
#define mp make_pair
#define st first
#define nd second
#define pb push_back
#define pf push_front
#define ppb pop_back
#define ppf pop_front
#define all(x) x.begin(),x.end()
#define len(x) strlen(x)
#define sz(x) (int) x.size()
#define orta ((bas+son)/2)
#define min3(x,y,z) min(min(x,y),z)
#define max3(x,y,z) max(max(x,y),z)
#define umin(x,y) x=min(x,y)
#define umax(x,y) x=max(x,y)
#define dbgs(x) cerr<<(#x)<<" --> "<<(x)<<" "
#define dbg(x) cerr<<(#x)<<" --> "<<(x)<<endl;getchar()
#define MOD 1000000007
#define inf 1000000005
#define M 10000002
#define N 30005
#define LOG 40
#define magic 100
#define KOK 250
#define EPS 0.0025
#define pw(x) ((1ll)<<(x))
#define PI 3.1415926535
using namespace std;
int n,m,b,p,from,to;
int dst[N];
vector<int> go[N];
int main() {
#if 0
freopen("input.txt","r",stdin);
#endif
scanf("%d %d",&n,&m);
for(int i=1;i<=m;i++) {
scanf("%d %d",&b,&p);
go[b].pb(p);
if(i==1) from=b;
if(i==2) to=b;
}
for(int i=0;i<n;i++) {
sort(all(go[i]));
go[i].erase(unique(all(go[i])),go[i].end());
}
fill(dst,dst+N,inf);
heap<ii> H;
H.push({0,from});
dst[from]=0;
while(!H.empty()) {
ii x=H.top();
H.pop();
if(dst[x.nd]<-x.st) continue ;
if(x.nd==to) {
printf("%d",dst[to]);
return 0;
}
for(int p:go[x.nd]) {
for(int i=x.nd+p;i<n;i+=p) {
if(dst[i]>-x.st+(i-x.nd)/p) H.push({-(dst[i]=-x.st+(i-x.nd)/p),i});
if(binary_search(all(go[i]),p)) break ;
}
for(int i=x.nd-p;i>=0;i-=p) {
if(dst[i]>-x.st+(x.nd-i)/p) H.push({-(dst[i]=-x.st+(x.nd-i)/p),i});
if(binary_search(all(go[i]),p)) break ;
}
}
}
printf("-1");
}
Compilation message
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:53:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d",&n,&m);
~~~~~^~~~~~~~~~~~~~~
skyscraper.cpp:57:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d",&b,&p);
~~~~~^~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1144 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1320 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1320 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1320 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1320 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1364 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1364 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1364 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1364 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1364 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1496 KB |
Output is correct |
| 5 |
Correct |
4 ms |
1496 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1496 KB |
Output is correct |
| 7 |
Correct |
2 ms |
1496 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1496 KB |
Output is correct |
| 9 |
Correct |
4 ms |
1496 KB |
Output is correct |
| 10 |
Correct |
3 ms |
1496 KB |
Output is correct |
| 11 |
Correct |
4 ms |
1496 KB |
Output is correct |
| 12 |
Correct |
3 ms |
1496 KB |
Output is correct |
| 13 |
Correct |
3 ms |
1496 KB |
Output is correct |
| 14 |
Correct |
3 ms |
1496 KB |
Output is correct |
| 15 |
Correct |
3 ms |
1496 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
1496 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1496 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1496 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1516 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1516 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1516 KB |
Output is correct |
| 7 |
Correct |
4 ms |
1516 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1516 KB |
Output is correct |
| 9 |
Correct |
3 ms |
1516 KB |
Output is correct |
| 10 |
Correct |
3 ms |
1516 KB |
Output is correct |
| 11 |
Correct |
5 ms |
1516 KB |
Output is correct |
| 12 |
Correct |
3 ms |
1516 KB |
Output is correct |
| 13 |
Correct |
3 ms |
1516 KB |
Output is correct |
| 14 |
Correct |
4 ms |
1516 KB |
Output is correct |
| 15 |
Correct |
4 ms |
1516 KB |
Output is correct |
| 16 |
Correct |
3 ms |
1516 KB |
Output is correct |
| 17 |
Correct |
4 ms |
1516 KB |
Output is correct |
| 18 |
Correct |
5 ms |
1516 KB |
Output is correct |
| 19 |
Correct |
3 ms |
1516 KB |
Output is correct |
| 20 |
Correct |
4 ms |
1516 KB |
Output is correct |
| 21 |
Correct |
3 ms |
1516 KB |
Output is correct |
| 22 |
Correct |
3 ms |
1516 KB |
Output is correct |
| 23 |
Correct |
4 ms |
1516 KB |
Output is correct |
| 24 |
Correct |
5 ms |
1516 KB |
Output is correct |
| 25 |
Correct |
4 ms |
1516 KB |
Output is correct |
| 26 |
Correct |
3 ms |
1516 KB |
Output is correct |
| 27 |
Correct |
3 ms |
1516 KB |
Output is correct |
| 28 |
Correct |
4 ms |
1516 KB |
Output is correct |
| 29 |
Correct |
5 ms |
1532 KB |
Output is correct |
| 30 |
Correct |
4 ms |
1532 KB |
Output is correct |
| 31 |
Correct |
4 ms |
1532 KB |
Output is correct |
| 32 |
Correct |
4 ms |
1556 KB |
Output is correct |
| 33 |
Correct |
6 ms |
1684 KB |
Output is correct |
| 34 |
Correct |
5 ms |
1688 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 2 |
Correct |
4 ms |
1688 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 9 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 10 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 11 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 12 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 13 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 14 |
Correct |
4 ms |
1688 KB |
Output is correct |
| 15 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 16 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 17 |
Correct |
4 ms |
1688 KB |
Output is correct |
| 18 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 19 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 20 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 21 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 22 |
Correct |
4 ms |
1688 KB |
Output is correct |
| 23 |
Correct |
3 ms |
1688 KB |
Output is correct |
| 24 |
Correct |
5 ms |
1688 KB |
Output is correct |
| 25 |
Correct |
4 ms |
1688 KB |
Output is correct |
| 26 |
Correct |
4 ms |
1688 KB |
Output is correct |
| 27 |
Correct |
4 ms |
1688 KB |
Output is correct |
| 28 |
Correct |
4 ms |
1688 KB |
Output is correct |
| 29 |
Correct |
4 ms |
1688 KB |
Output is correct |
| 30 |
Correct |
4 ms |
1688 KB |
Output is correct |
| 31 |
Correct |
5 ms |
1688 KB |
Output is correct |
| 32 |
Correct |
4 ms |
1688 KB |
Output is correct |
| 33 |
Correct |
5 ms |
1688 KB |
Output is correct |
| 34 |
Correct |
4 ms |
1688 KB |
Output is correct |
| 35 |
Correct |
12 ms |
1688 KB |
Output is correct |
| 36 |
Correct |
4 ms |
1688 KB |
Output is correct |
| 37 |
Correct |
11 ms |
1688 KB |
Output is correct |
| 38 |
Correct |
16 ms |
1788 KB |
Output is correct |
| 39 |
Correct |
12 ms |
1788 KB |
Output is correct |
| 40 |
Correct |
14 ms |
1788 KB |
Output is correct |
| 41 |
Correct |
17 ms |
1788 KB |
Output is correct |
| 42 |
Correct |
9 ms |
1788 KB |
Output is correct |
| 43 |
Correct |
9 ms |
1788 KB |
Output is correct |
| 44 |
Correct |
9 ms |
1788 KB |
Output is correct |
| 45 |
Correct |
16 ms |
1792 KB |
Output is correct |
| 46 |
Correct |
16 ms |
1792 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 2 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 3 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 4 |
Correct |
2 ms |
1792 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 7 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 9 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 10 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 11 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 12 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 13 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 14 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 15 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 16 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 17 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 18 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 19 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 20 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 21 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 22 |
Correct |
2 ms |
1792 KB |
Output is correct |
| 23 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 24 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 25 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 26 |
Correct |
3 ms |
1792 KB |
Output is correct |
| 27 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 28 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 29 |
Correct |
5 ms |
1792 KB |
Output is correct |
| 30 |
Correct |
5 ms |
1792 KB |
Output is correct |
| 31 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 32 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 33 |
Correct |
6 ms |
1792 KB |
Output is correct |
| 34 |
Correct |
5 ms |
1792 KB |
Output is correct |
| 35 |
Correct |
13 ms |
1792 KB |
Output is correct |
| 36 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 37 |
Correct |
10 ms |
1792 KB |
Output is correct |
| 38 |
Correct |
17 ms |
1792 KB |
Output is correct |
| 39 |
Correct |
13 ms |
1792 KB |
Output is correct |
| 40 |
Correct |
13 ms |
1792 KB |
Output is correct |
| 41 |
Correct |
17 ms |
1792 KB |
Output is correct |
| 42 |
Correct |
10 ms |
1792 KB |
Output is correct |
| 43 |
Correct |
10 ms |
1792 KB |
Output is correct |
| 44 |
Correct |
11 ms |
1792 KB |
Output is correct |
| 45 |
Correct |
16 ms |
1792 KB |
Output is correct |
| 46 |
Correct |
18 ms |
1792 KB |
Output is correct |
| 47 |
Correct |
18 ms |
2172 KB |
Output is correct |
| 48 |
Correct |
12 ms |
2172 KB |
Output is correct |
| 49 |
Correct |
13 ms |
2172 KB |
Output is correct |
| 50 |
Correct |
9 ms |
2172 KB |
Output is correct |
| 51 |
Correct |
28 ms |
2684 KB |
Output is correct |
| 52 |
Correct |
29 ms |
2684 KB |
Output is correct |
| 53 |
Correct |
16 ms |
2684 KB |
Output is correct |
| 54 |
Correct |
5 ms |
2684 KB |
Output is correct |
| 55 |
Correct |
6 ms |
2684 KB |
Output is correct |
| 56 |
Correct |
15 ms |
2684 KB |
Output is correct |
| 57 |
Correct |
4 ms |
2684 KB |
Output is correct |
| 58 |
Correct |
12 ms |
2684 KB |
Output is correct |
| 59 |
Correct |
18 ms |
2684 KB |
Output is correct |
| 60 |
Correct |
12 ms |
2684 KB |
Output is correct |
| 61 |
Correct |
14 ms |
2684 KB |
Output is correct |
| 62 |
Correct |
23 ms |
2684 KB |
Output is correct |
| 63 |
Correct |
62 ms |
2808 KB |
Output is correct |
| 64 |
Correct |
45 ms |
2808 KB |
Output is correct |
| 65 |
Correct |
61 ms |
2808 KB |
Output is correct |
| 66 |
Correct |
131 ms |
3820 KB |
Output is correct |
| 67 |
Correct |
71 ms |
3820 KB |
Output is correct |
