/* Bismillahir Rahmanir Rahim */
#include <bits/stdc++.h>
using namespace std;
const int N = 30005;
const int M = 250;
const int oo = 1e9;
struct data{
int cost, pos, b;
bool operator < (const data &p) const{
return cost > p.cost;
}
data () {}
data (int _cost, int _pos, int _b){
cost = _cost;
pos = _pos;
b = _b;
}
};
int dis[N][M+10];
int n, m, B[N], P[N];
vector<int>ps[N];
priority_queue<data>q;
void propagate(int pos, int sz, int pst){
int ds = pst;
for(int i=pos;i>=0;i-=sz){
if(dis[i][0] > ds){
dis[i][0] = ds;
q.push(data(ds, i, 0));
}
++ds;
}
ds = pst;
for(int i=pos;i<n;i+=sz){
if(dis[i][0] > ds){
dis[i][0] = ds;
q.push(data(ds, i, 0));
}
++ds;
}
}
int solve(){
for(int i=0;i<N;i++) for(int j=0;j<=M;j++) dis[i][j] = oo;
if(B[1] <= M){
dis[P[1]][B[1]] = 0;
q.push(data(0, P[1], B[1]));
}
else propagate(P[1], B[1], 0);
while(!q.empty()){
data u = q.top(); q.pop();
int pos = u.pos, sz = u.b;
for(auto u : ps[pos]){
if(B[u] <= M){
if(dis[pos][B[u]] > dis[pos][sz]){
dis[pos][B[u]] = dis[pos][sz];
q.push(data(dis[pos][sz], pos, B[u]));
}
}
else propagate(pos, B[u], dis[pos][sz]);
}
ps[pos].clear();
if(pos - sz >= 0 && dis[pos-sz][sz] > dis[pos][sz] + 1){
dis[pos-sz][sz] = dis[pos][sz] + 1;
q.push(data(dis[pos-sz][sz], pos-sz, sz));
}
if(pos + sz < n && dis[pos+sz][sz] > dis[pos][sz] + 1){
dis[pos+sz][sz] = dis[pos][sz] + 1;
q.push(data(dis[pos+sz][sz], pos+sz, sz));
}
}
int ret = oo;
for(int i=0;i<=M;i++) ret = min(ret, dis[P[2]][i]);
return ret == oo ? -1 : ret;
}
int main(){
scanf("%d %d", &n, &m);
for(int i=1;i<=m;i++) scanf("%d %d", &P[i], &B[i]);
for(int i=1;i<=m;i++) ps[P[i]].push_back(i);
int ret = solve();
printf("%d\n", ret);
return 0;
}
Compilation message
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:83:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", &n, &m);
^
skyscraper.cpp:84:55: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
for(int i=1;i<=m;i++) scanf("%d %d", &P[i], &B[i]);
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
33436 KB |
Output is correct |
| 2 |
Correct |
3 ms |
33436 KB |
Output is correct |
| 3 |
Correct |
3 ms |
33436 KB |
Output is correct |
| 4 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 5 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 6 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 7 |
Correct |
13 ms |
33436 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
33436 KB |
Output is correct |
| 2 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 3 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 4 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 5 |
Correct |
13 ms |
33436 KB |
Output is correct |
| 6 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 7 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 8 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 9 |
Correct |
0 ms |
33436 KB |
Output is correct |
| 10 |
Correct |
0 ms |
33436 KB |
Output is correct |
| 11 |
Correct |
3 ms |
33576 KB |
Output is correct |
| 12 |
Correct |
0 ms |
33436 KB |
Output is correct |
| 13 |
Correct |
3 ms |
33436 KB |
Output is correct |
| 14 |
Correct |
6 ms |
33576 KB |
Output is correct |
| 15 |
Correct |
13 ms |
33576 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 2 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 3 |
Correct |
0 ms |
33436 KB |
Output is correct |
| 4 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 5 |
Correct |
13 ms |
33436 KB |
Output is correct |
| 6 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 7 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 8 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 9 |
Correct |
0 ms |
33436 KB |
Output is correct |
| 10 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 11 |
Correct |
13 ms |
33576 KB |
Output is correct |
| 12 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 13 |
Correct |
16 ms |
33436 KB |
Output is correct |
| 14 |
Correct |
6 ms |
33576 KB |
Output is correct |
| 15 |
Correct |
3 ms |
33576 KB |
Output is correct |
| 16 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 17 |
Correct |
3 ms |
33584 KB |
Output is correct |
| 18 |
Correct |
0 ms |
33436 KB |
Output is correct |
| 19 |
Correct |
0 ms |
33436 KB |
Output is correct |
| 20 |
Correct |
9 ms |
33568 KB |
Output is correct |
| 21 |
Correct |
3 ms |
33436 KB |
Output is correct |
| 22 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 23 |
Correct |
0 ms |
33436 KB |
Output is correct |
| 24 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 25 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 26 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 27 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 28 |
Correct |
13 ms |
33568 KB |
Output is correct |
| 29 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 30 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 31 |
Correct |
3 ms |
33436 KB |
Output is correct |
| 32 |
Correct |
3 ms |
33436 KB |
Output is correct |
| 33 |
Correct |
23 ms |
33576 KB |
Output is correct |
| 34 |
Correct |
9 ms |
33576 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
33436 KB |
Output is correct |
| 2 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 3 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 4 |
Correct |
0 ms |
33436 KB |
Output is correct |
| 5 |
Correct |
3 ms |
33436 KB |
Output is correct |
| 6 |
Correct |
3 ms |
33436 KB |
Output is correct |
| 7 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 8 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 9 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 10 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 11 |
Correct |
9 ms |
33576 KB |
Output is correct |
| 12 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 13 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 14 |
Correct |
6 ms |
33576 KB |
Output is correct |
| 15 |
Correct |
9 ms |
33576 KB |
Output is correct |
| 16 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 17 |
Correct |
13 ms |
33584 KB |
Output is correct |
| 18 |
Correct |
13 ms |
33436 KB |
Output is correct |
| 19 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 20 |
Correct |
9 ms |
33568 KB |
Output is correct |
| 21 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 22 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 23 |
Correct |
13 ms |
33436 KB |
Output is correct |
| 24 |
Correct |
13 ms |
33436 KB |
Output is correct |
| 25 |
Correct |
0 ms |
33436 KB |
Output is correct |
| 26 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 27 |
Correct |
13 ms |
33436 KB |
Output is correct |
| 28 |
Correct |
9 ms |
33568 KB |
Output is correct |
| 29 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 30 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 31 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 32 |
Correct |
16 ms |
33436 KB |
Output is correct |
| 33 |
Correct |
16 ms |
33576 KB |
Output is correct |
| 34 |
Correct |
9 ms |
33576 KB |
Output is correct |
| 35 |
Correct |
23 ms |
33904 KB |
Output is correct |
| 36 |
Correct |
3 ms |
33568 KB |
Output is correct |
| 37 |
Correct |
26 ms |
34084 KB |
Output is correct |
| 38 |
Correct |
26 ms |
33852 KB |
Output is correct |
| 39 |
Correct |
26 ms |
33848 KB |
Output is correct |
| 40 |
Correct |
29 ms |
33852 KB |
Output is correct |
| 41 |
Correct |
26 ms |
33852 KB |
Output is correct |
| 42 |
Correct |
16 ms |
33712 KB |
Output is correct |
| 43 |
Correct |
9 ms |
33712 KB |
Output is correct |
| 44 |
Correct |
13 ms |
33708 KB |
Output is correct |
| 45 |
Correct |
59 ms |
34272 KB |
Output is correct |
| 46 |
Correct |
63 ms |
34276 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 2 |
Correct |
16 ms |
33436 KB |
Output is correct |
| 3 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 4 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 5 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 6 |
Correct |
3 ms |
33436 KB |
Output is correct |
| 7 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 8 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 9 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 10 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 11 |
Correct |
0 ms |
33576 KB |
Output is correct |
| 12 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 13 |
Correct |
13 ms |
33436 KB |
Output is correct |
| 14 |
Correct |
0 ms |
33576 KB |
Output is correct |
| 15 |
Correct |
0 ms |
33576 KB |
Output is correct |
| 16 |
Correct |
3 ms |
33436 KB |
Output is correct |
| 17 |
Correct |
13 ms |
33584 KB |
Output is correct |
| 18 |
Correct |
3 ms |
33436 KB |
Output is correct |
| 19 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 20 |
Correct |
3 ms |
33568 KB |
Output is correct |
| 21 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 22 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 23 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 24 |
Correct |
13 ms |
33436 KB |
Output is correct |
| 25 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 26 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 27 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 28 |
Correct |
9 ms |
33568 KB |
Output is correct |
| 29 |
Correct |
16 ms |
33436 KB |
Output is correct |
| 30 |
Correct |
3 ms |
33436 KB |
Output is correct |
| 31 |
Correct |
3 ms |
33436 KB |
Output is correct |
| 32 |
Correct |
6 ms |
33436 KB |
Output is correct |
| 33 |
Correct |
19 ms |
33576 KB |
Output is correct |
| 34 |
Correct |
19 ms |
33576 KB |
Output is correct |
| 35 |
Correct |
39 ms |
33904 KB |
Output is correct |
| 36 |
Correct |
6 ms |
33568 KB |
Output is correct |
| 37 |
Correct |
39 ms |
34084 KB |
Output is correct |
| 38 |
Correct |
36 ms |
33852 KB |
Output is correct |
| 39 |
Correct |
23 ms |
33848 KB |
Output is correct |
| 40 |
Correct |
19 ms |
33852 KB |
Output is correct |
| 41 |
Correct |
26 ms |
33852 KB |
Output is correct |
| 42 |
Correct |
23 ms |
33712 KB |
Output is correct |
| 43 |
Correct |
6 ms |
33712 KB |
Output is correct |
| 44 |
Correct |
9 ms |
33708 KB |
Output is correct |
| 45 |
Correct |
79 ms |
34272 KB |
Output is correct |
| 46 |
Correct |
73 ms |
34276 KB |
Output is correct |
| 47 |
Correct |
99 ms |
34440 KB |
Output is correct |
| 48 |
Correct |
16 ms |
33964 KB |
Output is correct |
| 49 |
Correct |
19 ms |
33964 KB |
Output is correct |
| 50 |
Correct |
6 ms |
33832 KB |
Output is correct |
| 51 |
Correct |
53 ms |
34688 KB |
Output is correct |
| 52 |
Correct |
69 ms |
34692 KB |
Output is correct |
| 53 |
Correct |
29 ms |
34096 KB |
Output is correct |
| 54 |
Correct |
13 ms |
33436 KB |
Output is correct |
| 55 |
Correct |
9 ms |
33436 KB |
Output is correct |
| 56 |
Correct |
19 ms |
34360 KB |
Output is correct |
| 57 |
Correct |
66 ms |
33568 KB |
Output is correct |
| 58 |
Correct |
23 ms |
33708 KB |
Output is correct |
| 59 |
Correct |
23 ms |
33708 KB |
Output is correct |
| 60 |
Correct |
26 ms |
33716 KB |
Output is correct |
| 61 |
Correct |
19 ms |
33724 KB |
Output is correct |
| 62 |
Correct |
56 ms |
34360 KB |
Output is correct |
| 63 |
Correct |
113 ms |
36056 KB |
Output is correct |
| 64 |
Correct |
173 ms |
36020 KB |
Output is correct |
| 65 |
Correct |
509 ms |
36044 KB |
Output is correct |
| 66 |
Execution timed out |
1000 ms |
34272 KB |
Execution timed out |
| 67 |
Halted |
0 ms |
0 KB |
- |
