#include <bits/stdc++.h>
using namespace std;
inline long long msb(long long val){return 63-__builtin_clzll(val);}
inline int msb(int val){return 31-__builtin_clz(val);}
//~ #define int long long
#define FASTIO ios_base::sync_with_stdio(false); cin.tie(NULL);
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define pii pair<int, int>
#define ff first
#define ss second
#define PI acos(-1)
#define ld long double
#define emplace_back push_back
template<class T> bool chmin(T& a, const T& b) {return a>b? a=b, true:false;}
template<class T> bool chmax(T& a, const T& b) {return a<b? a=b, true:false;}
const int mod = 1e9+7, N = 30000, M = 30000;
int n, m, k;
bitset<M> used[N];
bitset<N> vis[N];
int len[N];
vector<int> who_is_here[N];
void solve(int test_case){
int i, j;
cin >> n >> m;
int start;
for(i=0;i<m;i++){
int pos;
cin >> pos >> len[i];
if(i){
who_is_here[pos].pb(i);
}else {
start = pos;
}
}
//~ priority_queue<tuple<int,int,int>,vector<tuple<int,int,int>>, greater<tuple<int,int,int>>> q;
deque<array<int,3>> q;
q.emplace_back({0,start,0});
used[start][0] = 1;
vis[start][len[0]] = 1;
while(!q.empty()){
auto [dist, pos, i] = q.front(); q.pop_front();
if(i == 1){
cout << dist << '\n';
return;
}
while(who_is_here[pos].size()){
auto x = who_is_here[pos].back();
who_is_here[pos].pop_back();
if(x == 1){
cout << dist << '\n';
return;
}
if(vis[pos][len[x]])continue;
used[pos][x] = 1;
vis[pos][len[x]] = 1;
q.push_front({dist,pos,x});
}
if(pos - len[i] >=0 && !used[pos-len[i]][i] && !vis[pos-len[i]][len[i]]){
used[pos-len[i]][i] = 1;
vis[pos-len[i]][len[i]] = 1;
q.push_back({dist+1,pos-len[i],i});
}
if(pos + len[i] < n && !used[pos+len[i]][i] && !vis[pos+len[i]][len[i]]){
used[pos+len[i]][i] = 1;
vis[pos+len[i]][len[i]] = 1;
q.push_back({dist+1,pos+len[i],i});
}
}
cout << -1 << '\n';
return;
}
signed main(){
FASTIO;
//~ #define MULTITEST 1
#if MULTITEST
int _T;
cin >> _T;
for(int T_CASE = 1; T_CASE <= _T; T_CASE++)
solve(T_CASE);
#else
solve(1);
#endif
return 0;
}
Compilation message
skyscraper.cpp: In function 'void solve(int)':
skyscraper.cpp:24:9: warning: unused variable 'j' [-Wunused-variable]
24 | int i, j;
| ^
skyscraper.cpp:26:6: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized]
26 | int start;
| ^~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
972 KB |
Output is correct |
2 |
Correct |
1 ms |
972 KB |
Output is correct |
3 |
Correct |
1 ms |
972 KB |
Output is correct |
4 |
Correct |
1 ms |
972 KB |
Output is correct |
5 |
Correct |
1 ms |
976 KB |
Output is correct |
6 |
Correct |
1 ms |
972 KB |
Output is correct |
7 |
Correct |
1 ms |
1100 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
972 KB |
Output is correct |
2 |
Correct |
1 ms |
972 KB |
Output is correct |
3 |
Correct |
2 ms |
972 KB |
Output is correct |
4 |
Correct |
1 ms |
972 KB |
Output is correct |
5 |
Correct |
1 ms |
972 KB |
Output is correct |
6 |
Correct |
1 ms |
972 KB |
Output is correct |
7 |
Correct |
1 ms |
1056 KB |
Output is correct |
8 |
Correct |
1 ms |
972 KB |
Output is correct |
9 |
Correct |
1 ms |
1228 KB |
Output is correct |
10 |
Correct |
1 ms |
1484 KB |
Output is correct |
11 |
Correct |
2 ms |
1612 KB |
Output is correct |
12 |
Correct |
2 ms |
1612 KB |
Output is correct |
13 |
Correct |
2 ms |
1740 KB |
Output is correct |
14 |
Correct |
2 ms |
1740 KB |
Output is correct |
15 |
Correct |
2 ms |
1740 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
972 KB |
Output is correct |
2 |
Correct |
1 ms |
972 KB |
Output is correct |
3 |
Correct |
1 ms |
972 KB |
Output is correct |
4 |
Correct |
1 ms |
972 KB |
Output is correct |
5 |
Correct |
1 ms |
972 KB |
Output is correct |
6 |
Correct |
1 ms |
972 KB |
Output is correct |
7 |
Correct |
2 ms |
1100 KB |
Output is correct |
8 |
Correct |
1 ms |
972 KB |
Output is correct |
9 |
Correct |
1 ms |
1228 KB |
Output is correct |
10 |
Correct |
1 ms |
1484 KB |
Output is correct |
11 |
Correct |
2 ms |
1612 KB |
Output is correct |
12 |
Correct |
2 ms |
1612 KB |
Output is correct |
13 |
Correct |
2 ms |
1740 KB |
Output is correct |
14 |
Correct |
2 ms |
1740 KB |
Output is correct |
15 |
Correct |
2 ms |
1740 KB |
Output is correct |
16 |
Correct |
1 ms |
972 KB |
Output is correct |
17 |
Correct |
6 ms |
6460 KB |
Output is correct |
18 |
Correct |
1 ms |
972 KB |
Output is correct |
19 |
Correct |
1 ms |
1100 KB |
Output is correct |
20 |
Correct |
11 ms |
15692 KB |
Output is correct |
21 |
Correct |
1 ms |
972 KB |
Output is correct |
22 |
Correct |
1 ms |
972 KB |
Output is correct |
23 |
Correct |
8 ms |
11596 KB |
Output is correct |
24 |
Correct |
10 ms |
13900 KB |
Output is correct |
25 |
Correct |
3 ms |
3916 KB |
Output is correct |
26 |
Correct |
9 ms |
13532 KB |
Output is correct |
27 |
Correct |
11 ms |
14276 KB |
Output is correct |
28 |
Correct |
12 ms |
15788 KB |
Output is correct |
29 |
Correct |
14 ms |
15704 KB |
Output is correct |
30 |
Correct |
12 ms |
15692 KB |
Output is correct |
31 |
Correct |
12 ms |
15692 KB |
Output is correct |
32 |
Correct |
12 ms |
15720 KB |
Output is correct |
33 |
Correct |
16 ms |
15700 KB |
Output is correct |
34 |
Correct |
14 ms |
15692 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
972 KB |
Output is correct |
2 |
Correct |
1 ms |
972 KB |
Output is correct |
3 |
Correct |
1 ms |
972 KB |
Output is correct |
4 |
Correct |
1 ms |
972 KB |
Output is correct |
5 |
Correct |
2 ms |
972 KB |
Output is correct |
6 |
Correct |
1 ms |
972 KB |
Output is correct |
7 |
Correct |
1 ms |
1100 KB |
Output is correct |
8 |
Correct |
1 ms |
972 KB |
Output is correct |
9 |
Correct |
1 ms |
1228 KB |
Output is correct |
10 |
Correct |
2 ms |
1488 KB |
Output is correct |
11 |
Correct |
2 ms |
1612 KB |
Output is correct |
12 |
Correct |
2 ms |
1612 KB |
Output is correct |
13 |
Correct |
2 ms |
1864 KB |
Output is correct |
14 |
Correct |
3 ms |
1740 KB |
Output is correct |
15 |
Correct |
2 ms |
1740 KB |
Output is correct |
16 |
Correct |
1 ms |
972 KB |
Output is correct |
17 |
Correct |
5 ms |
6440 KB |
Output is correct |
18 |
Correct |
1 ms |
972 KB |
Output is correct |
19 |
Correct |
1 ms |
1100 KB |
Output is correct |
20 |
Correct |
11 ms |
15692 KB |
Output is correct |
21 |
Correct |
1 ms |
972 KB |
Output is correct |
22 |
Correct |
1 ms |
972 KB |
Output is correct |
23 |
Correct |
8 ms |
11596 KB |
Output is correct |
24 |
Correct |
11 ms |
13900 KB |
Output is correct |
25 |
Correct |
3 ms |
3788 KB |
Output is correct |
26 |
Correct |
9 ms |
13516 KB |
Output is correct |
27 |
Correct |
10 ms |
14284 KB |
Output is correct |
28 |
Correct |
15 ms |
15696 KB |
Output is correct |
29 |
Correct |
14 ms |
15684 KB |
Output is correct |
30 |
Correct |
14 ms |
15692 KB |
Output is correct |
31 |
Correct |
13 ms |
15652 KB |
Output is correct |
32 |
Correct |
12 ms |
15692 KB |
Output is correct |
33 |
Correct |
17 ms |
15768 KB |
Output is correct |
34 |
Correct |
14 ms |
15692 KB |
Output is correct |
35 |
Correct |
15 ms |
11980 KB |
Output is correct |
36 |
Correct |
4 ms |
4812 KB |
Output is correct |
37 |
Correct |
16 ms |
15692 KB |
Output is correct |
38 |
Correct |
20 ms |
16208 KB |
Output is correct |
39 |
Correct |
9 ms |
2252 KB |
Output is correct |
40 |
Correct |
11 ms |
6860 KB |
Output is correct |
41 |
Correct |
17 ms |
15180 KB |
Output is correct |
42 |
Correct |
14 ms |
13920 KB |
Output is correct |
43 |
Correct |
14 ms |
14668 KB |
Output is correct |
44 |
Correct |
15 ms |
15976 KB |
Output is correct |
45 |
Correct |
46 ms |
16400 KB |
Output is correct |
46 |
Correct |
31 ms |
16380 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
972 KB |
Output is correct |
2 |
Correct |
1 ms |
972 KB |
Output is correct |
3 |
Correct |
2 ms |
972 KB |
Output is correct |
4 |
Correct |
1 ms |
972 KB |
Output is correct |
5 |
Correct |
1 ms |
972 KB |
Output is correct |
6 |
Correct |
1 ms |
972 KB |
Output is correct |
7 |
Correct |
1 ms |
1100 KB |
Output is correct |
8 |
Correct |
1 ms |
972 KB |
Output is correct |
9 |
Correct |
1 ms |
1228 KB |
Output is correct |
10 |
Correct |
2 ms |
1484 KB |
Output is correct |
11 |
Correct |
2 ms |
1612 KB |
Output is correct |
12 |
Correct |
2 ms |
1612 KB |
Output is correct |
13 |
Correct |
2 ms |
1740 KB |
Output is correct |
14 |
Correct |
3 ms |
1740 KB |
Output is correct |
15 |
Correct |
2 ms |
1744 KB |
Output is correct |
16 |
Correct |
1 ms |
972 KB |
Output is correct |
17 |
Correct |
5 ms |
6476 KB |
Output is correct |
18 |
Correct |
1 ms |
972 KB |
Output is correct |
19 |
Correct |
1 ms |
1100 KB |
Output is correct |
20 |
Correct |
10 ms |
15692 KB |
Output is correct |
21 |
Correct |
1 ms |
972 KB |
Output is correct |
22 |
Correct |
1 ms |
972 KB |
Output is correct |
23 |
Correct |
9 ms |
11712 KB |
Output is correct |
24 |
Correct |
10 ms |
13900 KB |
Output is correct |
25 |
Correct |
3 ms |
3788 KB |
Output is correct |
26 |
Correct |
10 ms |
13516 KB |
Output is correct |
27 |
Correct |
10 ms |
14284 KB |
Output is correct |
28 |
Correct |
12 ms |
15736 KB |
Output is correct |
29 |
Correct |
13 ms |
15692 KB |
Output is correct |
30 |
Correct |
11 ms |
15656 KB |
Output is correct |
31 |
Correct |
12 ms |
15712 KB |
Output is correct |
32 |
Correct |
11 ms |
15708 KB |
Output is correct |
33 |
Correct |
19 ms |
15740 KB |
Output is correct |
34 |
Correct |
14 ms |
15712 KB |
Output is correct |
35 |
Correct |
17 ms |
12080 KB |
Output is correct |
36 |
Correct |
5 ms |
4812 KB |
Output is correct |
37 |
Correct |
16 ms |
15736 KB |
Output is correct |
38 |
Correct |
20 ms |
16212 KB |
Output is correct |
39 |
Correct |
10 ms |
2256 KB |
Output is correct |
40 |
Correct |
11 ms |
6860 KB |
Output is correct |
41 |
Correct |
18 ms |
15168 KB |
Output is correct |
42 |
Correct |
14 ms |
13900 KB |
Output is correct |
43 |
Correct |
15 ms |
14700 KB |
Output is correct |
44 |
Correct |
15 ms |
15972 KB |
Output is correct |
45 |
Correct |
62 ms |
16388 KB |
Output is correct |
46 |
Correct |
32 ms |
16400 KB |
Output is correct |
47 |
Correct |
53 ms |
63052 KB |
Output is correct |
48 |
Correct |
8 ms |
1496 KB |
Output is correct |
49 |
Correct |
8 ms |
1484 KB |
Output is correct |
50 |
Correct |
5 ms |
1396 KB |
Output is correct |
51 |
Correct |
134 ms |
170456 KB |
Output is correct |
52 |
Correct |
131 ms |
184772 KB |
Output is correct |
53 |
Correct |
30 ms |
35012 KB |
Output is correct |
54 |
Correct |
72 ms |
121524 KB |
Output is correct |
55 |
Correct |
96 ms |
154668 KB |
Output is correct |
56 |
Correct |
167 ms |
222276 KB |
Output is correct |
57 |
Correct |
4 ms |
4300 KB |
Output is correct |
58 |
Correct |
147 ms |
221556 KB |
Output is correct |
59 |
Correct |
137 ms |
206084 KB |
Output is correct |
60 |
Correct |
137 ms |
206116 KB |
Output is correct |
61 |
Correct |
131 ms |
195808 KB |
Output is correct |
62 |
Correct |
216 ms |
222288 KB |
Output is correct |
63 |
Correct |
499 ms |
221768 KB |
Output is correct |
64 |
Correct |
596 ms |
221796 KB |
Output is correct |
65 |
Correct |
800 ms |
222008 KB |
Output is correct |
66 |
Execution timed out |
1096 ms |
221980 KB |
Time limit exceeded |
67 |
Halted |
0 ms |
0 KB |
- |