#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<ll, int> plli;
typedef pair<double, double> pdd;
typedef pair<string, int> psi;
const int MOD = 1e9 + 7;
const ll oo = 1e15;
typedef long long ll;
int n , m;
pii d[30010];
bitset<30010> vis[30010];
vector<int> dogs[30010];
int main() {
//freopen("input.txt","r",stdin);
scanf("%d%d",&n,&m);
for (int i = 0; i < m; ++i){
scanf("%d%d",&d[i].first,&d[i].second);
dogs[d[i].first].push_back(d[i].second);
}
for (int i = 1; i <= n; ++i){
sort(dogs[i].begin(),dogs[i].end());
dogs[i].resize(unique(dogs[i].begin(),dogs[i].end()) - dogs[i].begin());
}
deque< pair<int , pii > > q;
vis[d[0].first][d[0].second] = 1;
q.push_front(make_pair(0,make_pair(d[0].first,d[0].second)));
while(!q.empty()){
pair<int , pii > src = q.front();
if(src.second.first == d[1].first){
printf("%d\n", src.first);
return 0;
}
q.pop_front();
for (int i = 0; i < dogs[src.second.first].size(); ++i){
int nw = dogs[src.second.first][i];
if(vis[src.second.first][nw])
continue;
vis[src.second.first][nw] = 1;
q.push_front(make_pair(src.first,make_pair(src.second.first,nw)));
}
for(int i = -1 ; i <= 1 ; i+= 2){
int nw = src.second.first + src.second.second* i;
if(nw < 0 || nw >= n)
continue;
if(vis[nw][src.second.second])
continue;
vis[nw][src.second.second]=1;
q.push_back(make_pair(1 + src.first,make_pair(nw,src.second.second)));
}
}
puts("-1");
return 0;
}
Compilation message
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:48:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < dogs[src.second.first].size(); ++i){
^
skyscraper.cpp:29:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&n,&m);
^
skyscraper.cpp:31:41: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&d[i].first,&d[i].second);
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 2 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 3 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 4 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 5 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 6 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 7 |
Correct |
0 ms |
112920 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 2 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 3 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 4 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 5 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 6 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 7 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 8 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 9 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 10 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 11 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 12 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 13 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 14 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 15 |
Correct |
0 ms |
112920 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 2 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 3 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 4 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 5 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 6 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 7 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 8 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 9 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 10 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 11 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 12 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 13 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 14 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 15 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 16 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 17 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 18 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 19 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 20 |
Correct |
0 ms |
113052 KB |
Output is correct |
| 21 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 22 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 23 |
Correct |
3 ms |
112920 KB |
Output is correct |
| 24 |
Correct |
3 ms |
112920 KB |
Output is correct |
| 25 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 26 |
Correct |
3 ms |
112920 KB |
Output is correct |
| 27 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 28 |
Correct |
6 ms |
113052 KB |
Output is correct |
| 29 |
Correct |
6 ms |
112920 KB |
Output is correct |
| 30 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 31 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 32 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 33 |
Correct |
3 ms |
112920 KB |
Output is correct |
| 34 |
Correct |
3 ms |
112920 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 2 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 3 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 4 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 5 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 6 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 7 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 8 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 9 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 10 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 11 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 12 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 13 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 14 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 15 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 16 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 17 |
Correct |
3 ms |
112920 KB |
Output is correct |
| 18 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 19 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 20 |
Correct |
0 ms |
113052 KB |
Output is correct |
| 21 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 22 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 23 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 24 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 25 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 26 |
Correct |
3 ms |
112920 KB |
Output is correct |
| 27 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 28 |
Correct |
6 ms |
113052 KB |
Output is correct |
| 29 |
Correct |
3 ms |
112920 KB |
Output is correct |
| 30 |
Correct |
3 ms |
112920 KB |
Output is correct |
| 31 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 32 |
Correct |
3 ms |
112920 KB |
Output is correct |
| 33 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 34 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 35 |
Correct |
13 ms |
113316 KB |
Output is correct |
| 36 |
Correct |
0 ms |
113052 KB |
Output is correct |
| 37 |
Correct |
6 ms |
113316 KB |
Output is correct |
| 38 |
Correct |
13 ms |
113456 KB |
Output is correct |
| 39 |
Correct |
9 ms |
113184 KB |
Output is correct |
| 40 |
Correct |
13 ms |
113184 KB |
Output is correct |
| 41 |
Correct |
9 ms |
113184 KB |
Output is correct |
| 42 |
Correct |
9 ms |
113196 KB |
Output is correct |
| 43 |
Correct |
6 ms |
113196 KB |
Output is correct |
| 44 |
Correct |
9 ms |
113192 KB |
Output is correct |
| 45 |
Correct |
43 ms |
113448 KB |
Output is correct |
| 46 |
Correct |
29 ms |
113448 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 2 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 3 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 4 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 5 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 6 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 7 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 8 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 9 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 10 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 11 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 12 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 13 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 14 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 15 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 16 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 17 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 18 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 19 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 20 |
Correct |
0 ms |
113052 KB |
Output is correct |
| 21 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 22 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 23 |
Correct |
3 ms |
112920 KB |
Output is correct |
| 24 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 25 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 26 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 27 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 28 |
Correct |
3 ms |
113052 KB |
Output is correct |
| 29 |
Correct |
6 ms |
112920 KB |
Output is correct |
| 30 |
Correct |
0 ms |
112920 KB |
Output is correct |
| 31 |
Correct |
6 ms |
112920 KB |
Output is correct |
| 32 |
Correct |
3 ms |
112920 KB |
Output is correct |
| 33 |
Correct |
6 ms |
112920 KB |
Output is correct |
| 34 |
Correct |
3 ms |
112920 KB |
Output is correct |
| 35 |
Correct |
16 ms |
113316 KB |
Output is correct |
| 36 |
Correct |
3 ms |
113052 KB |
Output is correct |
| 37 |
Correct |
16 ms |
113316 KB |
Output is correct |
| 38 |
Correct |
16 ms |
113456 KB |
Output is correct |
| 39 |
Correct |
3 ms |
113184 KB |
Output is correct |
| 40 |
Correct |
13 ms |
113184 KB |
Output is correct |
| 41 |
Correct |
16 ms |
113184 KB |
Output is correct |
| 42 |
Correct |
9 ms |
113196 KB |
Output is correct |
| 43 |
Correct |
3 ms |
113196 KB |
Output is correct |
| 44 |
Correct |
6 ms |
113192 KB |
Output is correct |
| 45 |
Correct |
39 ms |
113448 KB |
Output is correct |
| 46 |
Correct |
29 ms |
113448 KB |
Output is correct |
| 47 |
Correct |
16 ms |
113448 KB |
Output is correct |
| 48 |
Correct |
9 ms |
113448 KB |
Output is correct |
| 49 |
Correct |
13 ms |
113448 KB |
Output is correct |
| 50 |
Correct |
6 ms |
113316 KB |
Output is correct |
| 51 |
Correct |
33 ms |
113580 KB |
Output is correct |
| 52 |
Correct |
53 ms |
113580 KB |
Output is correct |
| 53 |
Correct |
6 ms |
113580 KB |
Output is correct |
| 54 |
Correct |
13 ms |
112920 KB |
Output is correct |
| 55 |
Correct |
9 ms |
112920 KB |
Output is correct |
| 56 |
Correct |
26 ms |
113844 KB |
Output is correct |
| 57 |
Correct |
3 ms |
113052 KB |
Output is correct |
| 58 |
Correct |
33 ms |
113192 KB |
Output is correct |
| 59 |
Correct |
19 ms |
113192 KB |
Output is correct |
| 60 |
Correct |
29 ms |
113200 KB |
Output is correct |
| 61 |
Correct |
36 ms |
113208 KB |
Output is correct |
| 62 |
Correct |
59 ms |
113844 KB |
Output is correct |
| 63 |
Correct |
146 ms |
113448 KB |
Output is correct |
| 64 |
Correct |
136 ms |
113316 KB |
Output is correct |
| 65 |
Correct |
186 ms |
113448 KB |
Output is correct |
| 66 |
Correct |
333 ms |
113448 KB |
Output is correct |
| 67 |
Correct |
179 ms |
113444 KB |
Output is correct |
