#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
using namespace std;
typedef long long ll;
const int INF = 1e9;
const int B = 295;
const int MAXN = 3e4 + 5;
vector<pair<int, int> > d;
int dist[MAXN][B];
vector<array<short, 3> > g[MAXN][B];
vector<short> sm[MAXN];
vector<short> bg[MAXN];
signed main()
{
//ifstream cin("input.txt");
//ofstream cout("output.txt");
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int n, m;
cin >> n >> m;
d.resize(m);
vector<int> big;
for (int i = 0; i < m; i++)
{
cin >> d[i].first >> d[i].second;
if (d[i].second >= B)
{
big.push_back(i);
bg[d[i].first].push_back(d[i].second);
}
else
{
sm[d[i].first].push_back(d[i].second);
}
}
for (int i = 0; i < n; i++)
for (int j = 0; j < B; j++)
dist[i][j] = INF;
for (int i = 0; i < m; i++)
{
if (d[i].second >= B) continue;
g[d[i].first][0].push_back({d[i].first, d[i].second, 0});
}
// for (auto& i : big)
// {
// for (int j = d[i].first, k = 0; j < n; j += d[i].second, k++)
// {
// g[d[i].first][0].push_back({j, 0, k});
// }
// for (int j = d[i].first, k = 0; j >= 0; j -= d[i].second, k++)
// {
// g[d[i].first][0].push_back({j, 0, k});
// }
// }
priority_queue<array<int, 3> > st;
st.push({0, d[0].first, 0});
dist[d[0].first][0] = 0;
while (!st.empty())
{
auto [dst, pos, pw] = st.top();
dst = -dst;
st.pop();
if (dst > dist[pos][pw]) continue;
if (dst != dist[pos][pw]) continue;
if (pw > 0)
{
vector<array<short, 3> > to;
if (pos - pw >= 0)
{
if (dist[pos - pw][pw] > dst + 1)
{
//st.erase({dist[pos - pw][pw], pos - pw, pw});
dist[pos - pw][pw] = dst + 1;
st.push({-dist[pos - pw][pw], pos - pw, pw});
}
if (dist[pos - pw][0] > dst + 1)
{
//st.erase({dist[pos - pw][0], pos - pw, 0});
dist[pos - pw][0] = dst + 1;
st.push({-dist[pos - pw][0], pos - pw, 0});
}
}
if (pos + pw < n)
{
if (dist[pos + pw][pw] > dst + 1)
{
//st.erase({dist[pos + pw][pw], pos + pw, pw});
dist[pos + pw][pw] = dst + 1;
st.push({-dist[pos + pw][pw], pos + pw, pw});
}
if (dist[pos + pw][0] > dst + 1)
{
//st.erase({dist[pos + pw][0], pos + pw, 0});
dist[pos + pw][0] = dst + 1;
st.push({-dist[pos + pw][0], pos + pw, 0});
}
}
continue;
}
for (auto& mv : bg[pos])
{
for (int j = pos, k = 0; j < n; j += mv, k++)
{
if (dist[j][0] > dst + k)
{
dist[j][0] = dst + k;
st.push({-dist[j][0], j, 0});
}
}
for (int j = pos, k = 0; j >= 0; j -= mv, k++)
{
if (dist[j][0] > dst + k)
{
dist[j][0] = dst + k;
st.push({-dist[j][0], j, 0});
}
}
}
for (auto& [psu, pwu, w] : g[pos][pw])
{
if (dist[psu][pwu] > dst + w)
{
//st.erase({dist[psu][pwu], psu, pwu});
dist[psu][pwu] = dst + w;
st.push({-dist[psu][pwu], psu, pwu});
}
}
}
int mn = INF;
for (int i = 0; i < B; i++)
mn = min(mn, dist[d[1].first][i]);
if (mn == INF)
cout << -1;
else
cout << mn;
return 0;
}
/*
small
(i, j) -1> (i - j, 0), (i + j, 0)
(i, 0) -0> (i, j)
(i, j) -1> (i - j, j), (i + j, j)
large
(i, 0) -1> (i + j, 0)
(i, 0) -1> (i - j, 0)
*/
Compilation message
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:50:42: warning: narrowing conversion of 'd.std::vector<std::pair<int, int> >::operator[](((std::vector<std::pair<int, int> >::size_type)i)).std::pair<int, int>::first' from 'int' to 'short int' [-Wnarrowing]
50 | g[d[i].first][0].push_back({d[i].first, d[i].second, 0});
skyscraper.cpp:50:54: warning: narrowing conversion of 'd.std::vector<std::pair<int, int> >::operator[](((std::vector<std::pair<int, int> >::size_type)i)).std::pair<int, int>::second' from 'int' to 'short int' [-Wnarrowing]
50 | g[d[i].first][0].push_back({d[i].first, d[i].second, 0});
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
95 ms |
209556 KB |
Output is correct |
2 |
Correct |
94 ms |
209576 KB |
Output is correct |
3 |
Correct |
93 ms |
209568 KB |
Output is correct |
4 |
Correct |
94 ms |
209496 KB |
Output is correct |
5 |
Correct |
93 ms |
209524 KB |
Output is correct |
6 |
Correct |
100 ms |
209552 KB |
Output is correct |
7 |
Correct |
93 ms |
209484 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
97 ms |
209532 KB |
Output is correct |
2 |
Correct |
102 ms |
209576 KB |
Output is correct |
3 |
Correct |
93 ms |
209484 KB |
Output is correct |
4 |
Correct |
114 ms |
209708 KB |
Output is correct |
5 |
Correct |
93 ms |
209536 KB |
Output is correct |
6 |
Correct |
98 ms |
209540 KB |
Output is correct |
7 |
Correct |
95 ms |
209464 KB |
Output is correct |
8 |
Correct |
94 ms |
209520 KB |
Output is correct |
9 |
Correct |
95 ms |
209684 KB |
Output is correct |
10 |
Correct |
98 ms |
209684 KB |
Output is correct |
11 |
Correct |
97 ms |
209848 KB |
Output is correct |
12 |
Correct |
104 ms |
209740 KB |
Output is correct |
13 |
Correct |
102 ms |
209740 KB |
Output is correct |
14 |
Correct |
101 ms |
209860 KB |
Output is correct |
15 |
Correct |
94 ms |
209724 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
102 ms |
209576 KB |
Output is correct |
2 |
Correct |
95 ms |
209548 KB |
Output is correct |
3 |
Correct |
94 ms |
209472 KB |
Output is correct |
4 |
Correct |
97 ms |
209540 KB |
Output is correct |
5 |
Correct |
98 ms |
209564 KB |
Output is correct |
6 |
Correct |
96 ms |
209580 KB |
Output is correct |
7 |
Correct |
93 ms |
209552 KB |
Output is correct |
8 |
Correct |
94 ms |
209540 KB |
Output is correct |
9 |
Correct |
95 ms |
209696 KB |
Output is correct |
10 |
Correct |
101 ms |
209612 KB |
Output is correct |
11 |
Correct |
94 ms |
209784 KB |
Output is correct |
12 |
Correct |
95 ms |
209740 KB |
Output is correct |
13 |
Correct |
94 ms |
209684 KB |
Output is correct |
14 |
Correct |
102 ms |
209740 KB |
Output is correct |
15 |
Correct |
96 ms |
209740 KB |
Output is correct |
16 |
Correct |
95 ms |
209820 KB |
Output is correct |
17 |
Correct |
106 ms |
210544 KB |
Output is correct |
18 |
Correct |
108 ms |
211636 KB |
Output is correct |
19 |
Correct |
100 ms |
211800 KB |
Output is correct |
20 |
Correct |
94 ms |
212032 KB |
Output is correct |
21 |
Correct |
95 ms |
210064 KB |
Output is correct |
22 |
Correct |
100 ms |
211640 KB |
Output is correct |
23 |
Correct |
99 ms |
211428 KB |
Output is correct |
24 |
Correct |
97 ms |
211916 KB |
Output is correct |
25 |
Correct |
95 ms |
211916 KB |
Output is correct |
26 |
Correct |
97 ms |
211848 KB |
Output is correct |
27 |
Correct |
99 ms |
211900 KB |
Output is correct |
28 |
Correct |
97 ms |
211892 KB |
Output is correct |
29 |
Correct |
115 ms |
211920 KB |
Output is correct |
30 |
Correct |
97 ms |
211852 KB |
Output is correct |
31 |
Correct |
97 ms |
211852 KB |
Output is correct |
32 |
Correct |
96 ms |
211840 KB |
Output is correct |
33 |
Correct |
108 ms |
212012 KB |
Output is correct |
34 |
Correct |
117 ms |
212108 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
96 ms |
209576 KB |
Output is correct |
2 |
Correct |
99 ms |
209456 KB |
Output is correct |
3 |
Correct |
96 ms |
209576 KB |
Output is correct |
4 |
Correct |
104 ms |
209580 KB |
Output is correct |
5 |
Correct |
97 ms |
209500 KB |
Output is correct |
6 |
Correct |
94 ms |
209544 KB |
Output is correct |
7 |
Correct |
113 ms |
209476 KB |
Output is correct |
8 |
Correct |
97 ms |
209616 KB |
Output is correct |
9 |
Correct |
98 ms |
209644 KB |
Output is correct |
10 |
Correct |
111 ms |
209592 KB |
Output is correct |
11 |
Correct |
114 ms |
209788 KB |
Output is correct |
12 |
Correct |
96 ms |
209804 KB |
Output is correct |
13 |
Correct |
98 ms |
209788 KB |
Output is correct |
14 |
Correct |
99 ms |
209764 KB |
Output is correct |
15 |
Correct |
101 ms |
209688 KB |
Output is correct |
16 |
Correct |
95 ms |
209780 KB |
Output is correct |
17 |
Correct |
98 ms |
210548 KB |
Output is correct |
18 |
Correct |
96 ms |
211532 KB |
Output is correct |
19 |
Correct |
98 ms |
211884 KB |
Output is correct |
20 |
Correct |
105 ms |
211956 KB |
Output is correct |
21 |
Correct |
94 ms |
210008 KB |
Output is correct |
22 |
Correct |
94 ms |
211640 KB |
Output is correct |
23 |
Correct |
98 ms |
211420 KB |
Output is correct |
24 |
Correct |
107 ms |
211852 KB |
Output is correct |
25 |
Correct |
101 ms |
211880 KB |
Output is correct |
26 |
Correct |
96 ms |
211892 KB |
Output is correct |
27 |
Correct |
96 ms |
211916 KB |
Output is correct |
28 |
Correct |
98 ms |
211940 KB |
Output is correct |
29 |
Correct |
105 ms |
211928 KB |
Output is correct |
30 |
Correct |
100 ms |
211900 KB |
Output is correct |
31 |
Correct |
98 ms |
211916 KB |
Output is correct |
32 |
Correct |
97 ms |
211872 KB |
Output is correct |
33 |
Correct |
107 ms |
212072 KB |
Output is correct |
34 |
Correct |
107 ms |
211956 KB |
Output is correct |
35 |
Correct |
113 ms |
211820 KB |
Output is correct |
36 |
Correct |
97 ms |
211092 KB |
Output is correct |
37 |
Correct |
119 ms |
212500 KB |
Output is correct |
38 |
Correct |
121 ms |
212584 KB |
Output is correct |
39 |
Correct |
121 ms |
212600 KB |
Output is correct |
40 |
Correct |
114 ms |
212652 KB |
Output is correct |
41 |
Correct |
118 ms |
212644 KB |
Output is correct |
42 |
Correct |
108 ms |
212496 KB |
Output is correct |
43 |
Correct |
98 ms |
212592 KB |
Output is correct |
44 |
Correct |
101 ms |
212580 KB |
Output is correct |
45 |
Correct |
171 ms |
212988 KB |
Output is correct |
46 |
Correct |
174 ms |
213004 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
94 ms |
209484 KB |
Output is correct |
2 |
Correct |
100 ms |
209584 KB |
Output is correct |
3 |
Correct |
92 ms |
209488 KB |
Output is correct |
4 |
Correct |
94 ms |
209620 KB |
Output is correct |
5 |
Correct |
93 ms |
209544 KB |
Output is correct |
6 |
Correct |
95 ms |
209484 KB |
Output is correct |
7 |
Correct |
101 ms |
209568 KB |
Output is correct |
8 |
Correct |
96 ms |
209616 KB |
Output is correct |
9 |
Correct |
98 ms |
209604 KB |
Output is correct |
10 |
Correct |
102 ms |
209700 KB |
Output is correct |
11 |
Correct |
99 ms |
209704 KB |
Output is correct |
12 |
Correct |
94 ms |
209784 KB |
Output is correct |
13 |
Correct |
94 ms |
209624 KB |
Output is correct |
14 |
Correct |
95 ms |
209796 KB |
Output is correct |
15 |
Correct |
95 ms |
209784 KB |
Output is correct |
16 |
Correct |
94 ms |
209740 KB |
Output is correct |
17 |
Correct |
99 ms |
210544 KB |
Output is correct |
18 |
Correct |
97 ms |
211644 KB |
Output is correct |
19 |
Correct |
97 ms |
211912 KB |
Output is correct |
20 |
Correct |
96 ms |
211916 KB |
Output is correct |
21 |
Correct |
95 ms |
209988 KB |
Output is correct |
22 |
Correct |
95 ms |
211656 KB |
Output is correct |
23 |
Correct |
101 ms |
211448 KB |
Output is correct |
24 |
Correct |
103 ms |
211784 KB |
Output is correct |
25 |
Correct |
100 ms |
211876 KB |
Output is correct |
26 |
Correct |
97 ms |
212032 KB |
Output is correct |
27 |
Correct |
96 ms |
211848 KB |
Output is correct |
28 |
Correct |
98 ms |
211916 KB |
Output is correct |
29 |
Correct |
108 ms |
211916 KB |
Output is correct |
30 |
Correct |
99 ms |
211900 KB |
Output is correct |
31 |
Correct |
100 ms |
211864 KB |
Output is correct |
32 |
Correct |
104 ms |
212052 KB |
Output is correct |
33 |
Correct |
115 ms |
212016 KB |
Output is correct |
34 |
Correct |
117 ms |
211916 KB |
Output is correct |
35 |
Correct |
110 ms |
211796 KB |
Output is correct |
36 |
Correct |
104 ms |
210968 KB |
Output is correct |
37 |
Correct |
125 ms |
212584 KB |
Output is correct |
38 |
Correct |
115 ms |
212636 KB |
Output is correct |
39 |
Correct |
117 ms |
212720 KB |
Output is correct |
40 |
Correct |
119 ms |
212556 KB |
Output is correct |
41 |
Correct |
121 ms |
212536 KB |
Output is correct |
42 |
Correct |
108 ms |
212516 KB |
Output is correct |
43 |
Correct |
106 ms |
212528 KB |
Output is correct |
44 |
Correct |
105 ms |
212556 KB |
Output is correct |
45 |
Correct |
175 ms |
213008 KB |
Output is correct |
46 |
Correct |
178 ms |
213012 KB |
Output is correct |
47 |
Correct |
187 ms |
225012 KB |
Output is correct |
48 |
Correct |
112 ms |
237000 KB |
Output is correct |
49 |
Correct |
124 ms |
239576 KB |
Output is correct |
50 |
Correct |
112 ms |
242256 KB |
Output is correct |
51 |
Correct |
152 ms |
245684 KB |
Output is correct |
52 |
Correct |
171 ms |
245752 KB |
Output is correct |
53 |
Correct |
126 ms |
245048 KB |
Output is correct |
54 |
Correct |
114 ms |
244148 KB |
Output is correct |
55 |
Correct |
111 ms |
244204 KB |
Output is correct |
56 |
Correct |
129 ms |
246220 KB |
Output is correct |
57 |
Correct |
183 ms |
244308 KB |
Output is correct |
58 |
Correct |
121 ms |
244856 KB |
Output is correct |
59 |
Correct |
121 ms |
244828 KB |
Output is correct |
60 |
Correct |
125 ms |
244844 KB |
Output is correct |
61 |
Correct |
128 ms |
244896 KB |
Output is correct |
62 |
Correct |
152 ms |
245512 KB |
Output is correct |
63 |
Correct |
322 ms |
245636 KB |
Output is correct |
64 |
Correct |
354 ms |
245604 KB |
Output is correct |
65 |
Correct |
754 ms |
246468 KB |
Output is correct |
66 |
Execution timed out |
1096 ms |
245320 KB |
Time limit exceeded |
67 |
Halted |
0 ms |
0 KB |
- |