#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,pii> plii;
const int MAXN = 3e4+10;
const int BLK = 200;
#define dist first
#define index second.first
#define delta second.second
int N, M, X, Y;
vector<pii> v[MAXN];
ll d[MAXN][BLK];
map<pii, bool> ok;
priority_queue<plii, vector<plii>, greater<plii>> q;
ll dBig[MAXN];
int posBig[MAXN];
inline void proc(int i, int dx, ll dd) {
if (dx < BLK) {
if (d[i][dx] == -1 || dd < d[i][dx]) {
d[i][dx] = dd;
q.push({dd, {i, dx}});
}
} else {
if (dBig[i] == -1 || dd < dBig[i]) {
dBig[i] = dd;
q.push({dd, {i, dx}});
}
}
}
inline void procBig(int cur, int dx, ll d0) {
int i = cur, cnt = 0;
while ((i-=dx) >= 0) proc(i, 0, d0 + (++cnt));
i = cur, cnt = 0;
while ((i+=dx) < N) proc(i, 0, d0 + (++cnt));
}
inline void procSmall(int cur, int dx, ll d0) {
if (cur - dx >= 0) {
proc(cur-dx, dx, d0+1);
proc(cur-dx, 0, d0+1);
}
if (cur + dx < N) {
proc(cur+dx, dx, d0+1);
proc(cur+dx, 0, d0+1);
}
}
inline void proc0(int ix) {
for (pii p : v[ix])
proc(p.first<BLK?ix:p.second, p.first, d[ix][0]);
}
void dijkstra() {
memset(d, -1, sizeof(d));
memset(dBig, -1, sizeof(dBig));
d[X][0] = 0; q.push({0,{X,0}});
while (!q.empty()) {
plii p = q.top(); q.pop();
if (p.delta < BLK && d[p.index][p.delta] < p.dist) continue;
else if (p.delta >= BLK && dBig[p.index] < p.dist) continue;
if (p.index == Y && p.delta == 0) return;
if (p.delta == 0) proc0(p.index);
else if (p.delta < BLK) procSmall(p.index, p.delta, p.dist);
else procBig(posBig[p.index], p.delta, p.dist);
}
}
int main()
{
scanf("%d %d", &N, &M);
for (int i = 0,a,b; i < M; i++) {
scanf("%d %d", &a, &b);
if (i == 0) X = a;
else if (i == 1) Y = a;
if (b != 0) v[a].push_back(pii(b,i));
posBig[i] = a;
}
for (int i = 0; i < N; i++)
sort(v[i].begin(), v[i].end()),
v[i].resize(unique(v[i].begin(), v[i].end()) - v[i].begin());
dijkstra();
printf("%lld\n", d[Y][0]);
}
Compilation message
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:81:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", &N, &M);
^
skyscraper.cpp:83:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", &a, &b);
^
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
49972 KB |
Output is correct |
2 |
Correct |
9 ms |
49972 KB |
Output is correct |
3 |
Correct |
9 ms |
49972 KB |
Output is correct |
4 |
Correct |
3 ms |
49972 KB |
Output is correct |
5 |
Correct |
0 ms |
49972 KB |
Output is correct |
6 |
Correct |
0 ms |
49972 KB |
Output is correct |
7 |
Correct |
0 ms |
49972 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
49972 KB |
Output is correct |
2 |
Correct |
0 ms |
49972 KB |
Output is correct |
3 |
Correct |
3 ms |
49972 KB |
Output is correct |
4 |
Correct |
6 ms |
49972 KB |
Output is correct |
5 |
Correct |
3 ms |
49972 KB |
Output is correct |
6 |
Correct |
6 ms |
49972 KB |
Output is correct |
7 |
Correct |
0 ms |
49972 KB |
Output is correct |
8 |
Correct |
6 ms |
49972 KB |
Output is correct |
9 |
Correct |
0 ms |
49972 KB |
Output is correct |
10 |
Correct |
3 ms |
49972 KB |
Output is correct |
11 |
Correct |
3 ms |
49972 KB |
Output is correct |
12 |
Correct |
6 ms |
49972 KB |
Output is correct |
13 |
Correct |
3 ms |
49972 KB |
Output is correct |
14 |
Correct |
9 ms |
50108 KB |
Output is correct |
15 |
Correct |
3 ms |
50108 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
9 ms |
49972 KB |
Output is correct |
2 |
Correct |
0 ms |
49972 KB |
Output is correct |
3 |
Correct |
6 ms |
49972 KB |
Output is correct |
4 |
Correct |
6 ms |
49972 KB |
Output is correct |
5 |
Correct |
6 ms |
49972 KB |
Output is correct |
6 |
Correct |
6 ms |
49972 KB |
Output is correct |
7 |
Correct |
0 ms |
49972 KB |
Output is correct |
8 |
Correct |
9 ms |
49972 KB |
Output is correct |
9 |
Correct |
3 ms |
49972 KB |
Output is correct |
10 |
Correct |
6 ms |
49972 KB |
Output is correct |
11 |
Correct |
3 ms |
49972 KB |
Output is correct |
12 |
Correct |
0 ms |
49972 KB |
Output is correct |
13 |
Correct |
0 ms |
49972 KB |
Output is correct |
14 |
Correct |
3 ms |
50108 KB |
Output is correct |
15 |
Correct |
0 ms |
50108 KB |
Output is correct |
16 |
Correct |
0 ms |
49972 KB |
Output is correct |
17 |
Correct |
9 ms |
50112 KB |
Output is correct |
18 |
Correct |
0 ms |
49972 KB |
Output is correct |
19 |
Correct |
0 ms |
49972 KB |
Output is correct |
20 |
Correct |
3 ms |
50104 KB |
Output is correct |
21 |
Correct |
3 ms |
49972 KB |
Output is correct |
22 |
Correct |
6 ms |
49972 KB |
Output is correct |
23 |
Correct |
3 ms |
49972 KB |
Output is correct |
24 |
Correct |
9 ms |
50104 KB |
Output is correct |
25 |
Correct |
6 ms |
49972 KB |
Output is correct |
26 |
Correct |
9 ms |
49972 KB |
Output is correct |
27 |
Correct |
0 ms |
49972 KB |
Output is correct |
28 |
Correct |
3 ms |
50104 KB |
Output is correct |
29 |
Correct |
13 ms |
49972 KB |
Output is correct |
30 |
Correct |
0 ms |
49972 KB |
Output is correct |
31 |
Correct |
9 ms |
49972 KB |
Output is correct |
32 |
Correct |
6 ms |
49972 KB |
Output is correct |
33 |
Correct |
19 ms |
50104 KB |
Output is correct |
34 |
Correct |
13 ms |
50108 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
49972 KB |
Output is correct |
2 |
Correct |
13 ms |
49972 KB |
Output is correct |
3 |
Correct |
6 ms |
49972 KB |
Output is correct |
4 |
Correct |
0 ms |
49972 KB |
Output is correct |
5 |
Correct |
3 ms |
49972 KB |
Output is correct |
6 |
Correct |
3 ms |
49972 KB |
Output is correct |
7 |
Correct |
6 ms |
49972 KB |
Output is correct |
8 |
Correct |
3 ms |
49972 KB |
Output is correct |
9 |
Correct |
9 ms |
49972 KB |
Output is correct |
10 |
Correct |
0 ms |
49972 KB |
Output is correct |
11 |
Correct |
0 ms |
49972 KB |
Output is correct |
12 |
Correct |
3 ms |
49972 KB |
Output is correct |
13 |
Correct |
3 ms |
49972 KB |
Output is correct |
14 |
Correct |
3 ms |
50108 KB |
Output is correct |
15 |
Correct |
3 ms |
50108 KB |
Output is correct |
16 |
Correct |
3 ms |
49972 KB |
Output is correct |
17 |
Correct |
9 ms |
50112 KB |
Output is correct |
18 |
Correct |
6 ms |
49972 KB |
Output is correct |
19 |
Correct |
13 ms |
49972 KB |
Output is correct |
20 |
Correct |
9 ms |
50104 KB |
Output is correct |
21 |
Correct |
3 ms |
49972 KB |
Output is correct |
22 |
Correct |
3 ms |
49972 KB |
Output is correct |
23 |
Correct |
3 ms |
49972 KB |
Output is correct |
24 |
Correct |
13 ms |
50104 KB |
Output is correct |
25 |
Correct |
0 ms |
49972 KB |
Output is correct |
26 |
Correct |
0 ms |
49972 KB |
Output is correct |
27 |
Correct |
9 ms |
49972 KB |
Output is correct |
28 |
Correct |
13 ms |
50104 KB |
Output is correct |
29 |
Correct |
13 ms |
49972 KB |
Output is correct |
30 |
Correct |
3 ms |
49972 KB |
Output is correct |
31 |
Correct |
9 ms |
49972 KB |
Output is correct |
32 |
Correct |
6 ms |
49972 KB |
Output is correct |
33 |
Correct |
16 ms |
50104 KB |
Output is correct |
34 |
Correct |
16 ms |
50108 KB |
Output is correct |
35 |
Correct |
33 ms |
51184 KB |
Output is correct |
36 |
Correct |
9 ms |
50104 KB |
Output is correct |
37 |
Correct |
9 ms |
50748 KB |
Output is correct |
38 |
Correct |
16 ms |
50632 KB |
Output is correct |
39 |
Correct |
19 ms |
50368 KB |
Output is correct |
40 |
Correct |
13 ms |
50504 KB |
Output is correct |
41 |
Correct |
19 ms |
50632 KB |
Output is correct |
42 |
Correct |
19 ms |
50444 KB |
Output is correct |
43 |
Correct |
6 ms |
50444 KB |
Output is correct |
44 |
Correct |
13 ms |
50460 KB |
Output is correct |
45 |
Correct |
89 ms |
51176 KB |
Output is correct |
46 |
Correct |
49 ms |
51172 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
49972 KB |
Output is correct |
2 |
Correct |
3 ms |
49972 KB |
Output is correct |
3 |
Correct |
0 ms |
49972 KB |
Output is correct |
4 |
Correct |
3 ms |
49972 KB |
Output is correct |
5 |
Correct |
3 ms |
49972 KB |
Output is correct |
6 |
Correct |
3 ms |
49972 KB |
Output is correct |
7 |
Correct |
3 ms |
49972 KB |
Output is correct |
8 |
Correct |
0 ms |
49972 KB |
Output is correct |
9 |
Correct |
6 ms |
49972 KB |
Output is correct |
10 |
Correct |
6 ms |
49972 KB |
Output is correct |
11 |
Correct |
3 ms |
49972 KB |
Output is correct |
12 |
Correct |
0 ms |
49972 KB |
Output is correct |
13 |
Correct |
6 ms |
49972 KB |
Output is correct |
14 |
Correct |
0 ms |
50108 KB |
Output is correct |
15 |
Correct |
6 ms |
50108 KB |
Output is correct |
16 |
Correct |
3 ms |
49972 KB |
Output is correct |
17 |
Correct |
3 ms |
50112 KB |
Output is correct |
18 |
Correct |
6 ms |
49972 KB |
Output is correct |
19 |
Correct |
3 ms |
49972 KB |
Output is correct |
20 |
Correct |
9 ms |
50104 KB |
Output is correct |
21 |
Correct |
13 ms |
49972 KB |
Output is correct |
22 |
Correct |
9 ms |
49972 KB |
Output is correct |
23 |
Correct |
6 ms |
49972 KB |
Output is correct |
24 |
Correct |
6 ms |
50104 KB |
Output is correct |
25 |
Correct |
3 ms |
49972 KB |
Output is correct |
26 |
Correct |
6 ms |
49972 KB |
Output is correct |
27 |
Correct |
3 ms |
49972 KB |
Output is correct |
28 |
Correct |
6 ms |
50104 KB |
Output is correct |
29 |
Correct |
16 ms |
49972 KB |
Output is correct |
30 |
Correct |
6 ms |
49972 KB |
Output is correct |
31 |
Correct |
6 ms |
49972 KB |
Output is correct |
32 |
Correct |
6 ms |
49972 KB |
Output is correct |
33 |
Correct |
16 ms |
50104 KB |
Output is correct |
34 |
Correct |
19 ms |
50108 KB |
Output is correct |
35 |
Correct |
19 ms |
51184 KB |
Output is correct |
36 |
Correct |
13 ms |
50104 KB |
Output is correct |
37 |
Correct |
16 ms |
50748 KB |
Output is correct |
38 |
Correct |
19 ms |
50632 KB |
Output is correct |
39 |
Correct |
13 ms |
50368 KB |
Output is correct |
40 |
Correct |
23 ms |
50504 KB |
Output is correct |
41 |
Correct |
19 ms |
50632 KB |
Output is correct |
42 |
Correct |
16 ms |
50444 KB |
Output is correct |
43 |
Correct |
13 ms |
50444 KB |
Output is correct |
44 |
Correct |
19 ms |
50460 KB |
Output is correct |
45 |
Correct |
83 ms |
51176 KB |
Output is correct |
46 |
Correct |
46 ms |
51172 KB |
Output is correct |
47 |
Correct |
19 ms |
51252 KB |
Output is correct |
48 |
Correct |
13 ms |
50500 KB |
Output is correct |
49 |
Correct |
9 ms |
50500 KB |
Output is correct |
50 |
Correct |
9 ms |
50368 KB |
Output is correct |
51 |
Correct |
33 ms |
51456 KB |
Output is correct |
52 |
Correct |
43 ms |
51460 KB |
Output is correct |
53 |
Correct |
26 ms |
50632 KB |
Output is correct |
54 |
Correct |
3 ms |
49972 KB |
Output is correct |
55 |
Correct |
6 ms |
49972 KB |
Output is correct |
56 |
Correct |
19 ms |
50896 KB |
Output is correct |
57 |
Correct |
3 ms |
50104 KB |
Output is correct |
58 |
Correct |
26 ms |
50440 KB |
Output is correct |
59 |
Correct |
19 ms |
50440 KB |
Output is correct |
60 |
Correct |
26 ms |
50448 KB |
Output is correct |
61 |
Correct |
26 ms |
50464 KB |
Output is correct |
62 |
Correct |
66 ms |
50896 KB |
Output is correct |
63 |
Correct |
106 ms |
53556 KB |
Output is correct |
64 |
Correct |
116 ms |
53500 KB |
Output is correct |
65 |
Correct |
629 ms |
53540 KB |
Output is correct |
66 |
Execution timed out |
1000 ms |
53480 KB |
Execution timed out |
67 |
Halted |
0 ms |
0 KB |
- |