QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #34176 | #4231. Rafting Trip | Heltion# | AC ✓ | 51ms | 35688kb | C++20 | 3.3kb | 2022-06-05 21:31:55 | 2022-06-05 21:31:56 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n, m;
cin >> n >> m;
vector<string> vs(n);
for (auto& s : vs) cin >> s;
vector r(n, vector<int>(m)), mk(n, vector<int>(m));
vector f(n * m, -1), vis(n * m, 0), inc(n * m, 0);
for (int i = 0; i < n; i += 1)
for (int j = 0; j < m; j += 1)
if (vs[i][j] != '#' and vs[i][j] != '.')
r[i][j] = 1;
for (int i = 0; i < n; i += 1)
for (int j = 0; j < m; j += 1)
if (r[i][j]) {
if (vs[i][j] == '<')
if (j and r[i][j - 1])
f[i * m + j] = i * m + j - 1;
if (vs[i][j] == '>')
if (j + 1 < m and r[i][j + 1])
f[i * m + j] = i * m + j + 1;
if (vs[i][j] == '^')
if (i and r[i - 1][j])
f[i * m + j] = (i - 1) * m + j;
if (vs[i][j] == 'v')
if (i + 1 < n and r[i + 1][j])
f[i * m + j] = (i + 1) * m + j;
if (f[i * m + j] == -1)
f[i * m + j] = i * m + j;
}
vector<vector<int>> cs;
for (int i = 0; i < n * m; i += 1)
if (f[i] != -1 and not vis[i]) {
vector<int> w;
int j = i;
for (; not vis[j]; j = f[j]) {
vis[j] = 1;
w.push_back(j);
}
if (ranges::count(w, j)) {
int k = 0;
while (w[k] != j) k += 1;
cs.emplace_back(w.begin() + k, w.end());
for (int ci : cs.back()) inc[ci] = 1;
}
}
vector<vector<int>> G(n * m);
for (int i = 0; i < n * m; i += 1)
if (f[i] != -1 and not inc[i])
G[f[i]].push_back(i);
int ans = 0;
vector<int> dx = {-1, 1, 0, 0}, dy = {0, 0, -1, 1};
for (auto c : cs) {
int pans = 0;
vector<pair<int, int>> vp;
for (int ci : c) {
int x = ci / m, y = ci % m;
for (int j = 0; j < 4; j += 1) {
int kx = x + dx[j], ky = y + dy[j];
if (kx >= 0 and kx < n and ky >= 0 and ky < m) {
if (vs[kx][ky] == '#' and not mk[kx][ky]) {
pans += mk[kx][ky] = 1;
vp.emplace_back(kx, ky);
}
}
}
}
ans = max(ans, pans);
function<void(int)> DFS = [&](int u) {
vector<pair<int, int>> vp;
int x = u / m, y = u % m;
for (int j = 0; j < 4; j += 1) {
int kx = x + dx[j], ky = y + dy[j];
if (kx >= 0 and kx < n and ky >= 0 and ky < m) {
if (vs[kx][ky] == '#' and not mk[kx][ky]) {
pans += mk[kx][ky] = 1;
vp.emplace_back(kx, ky);
}
}
}
ans = max(ans, pans);
for (int v : G[u]) DFS(v);
pans -= vp.size();
for (auto [x, y] : vp) mk[x][y] = 0;
};
for (int ci : c) DFS(ci);
for (auto [x, y] : vp) mk[x][y] = 0;
}
cout << ans;
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 3624kb
input:
5 6 v<<<#v v#v<.> >>v<<< ..v##^ #<<<.^
output:
4
result:
ok single line: '4'
Test #2:
score: 0
Accepted
time: 0ms
memory: 3572kb
input:
4 5 >v<<. ^<..# #...# .#>^#
output:
2
result:
ok single line: '2'
Test #3:
score: 0
Accepted
time: 2ms
memory: 3660kb
input:
4 6 >>v#>v ^#>>^v ^<<#v< .#^<<#
output:
5
result:
ok single line: '5'
Test #4:
score: 0
Accepted
time: 2ms
memory: 3644kb
input:
6 6 ^.>>>> ^..... ^....v ^....v #....v <<<<#v
output:
2
result:
ok single line: '2'
Test #5:
score: 0
Accepted
time: 2ms
memory: 3724kb
input:
6 7 ^>>>>>v ^.....v ^.#^..v ^.#^<.v ^.....v ^<<<<<<
output:
2
result:
ok single line: '2'
Test #6:
score: 0
Accepted
time: 2ms
memory: 3656kb
input:
3 7 >v<<<<# ^<##### #^<<<<<
output:
6
result:
ok single line: '6'
Test #7:
score: 0
Accepted
time: 1ms
memory: 3624kb
input:
3 5 ><.v# ##.^# ...#.
output:
3
result:
ok single line: '3'
Test #8:
score: 0
Accepted
time: 2ms
memory: 3576kb
input:
7 3 ### #># ### ... ### #>. ###
output:
4
result:
ok single line: '4'
Test #9:
score: 0
Accepted
time: 2ms
memory: 3676kb
input:
2 2 >. .#
output:
0
result:
ok single line: '0'
Test #10:
score: 0
Accepted
time: 2ms
memory: 3700kb
input:
2 2 .. .v
output:
0
result:
ok single line: '0'
Test #11:
score: 0
Accepted
time: 31ms
memory: 29756kb
input:
498 498 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<...
output:
41195
result:
ok single line: '41195'
Test #12:
score: 0
Accepted
time: 38ms
memory: 32708kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
24926
result:
ok single line: '24926'
Test #13:
score: 0
Accepted
time: 30ms
memory: 25260kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
24924
result:
ok single line: '24924'
Test #14:
score: 0
Accepted
time: 28ms
memory: 16648kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
2056
result:
ok single line: '2056'
Test #15:
score: 0
Accepted
time: 37ms
memory: 18692kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
970
result:
ok single line: '970'
Test #16:
score: 0
Accepted
time: 41ms
memory: 20316kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
687
result:
ok single line: '687'
Test #17:
score: 0
Accepted
time: 44ms
memory: 20492kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
481
result:
ok single line: '481'
Test #18:
score: 0
Accepted
time: 31ms
memory: 18204kb
input:
500 500 .>^v.^<<^<<<<<<....><v#....^.#.^..#.^<<<<#..#.><v.v..>>^<<..###..^<v..#>>>#.....^>^#.##.#......#.....#v#.>v.v#..##.#.^>>>>>v..#.v<..^...^..^#....#..>v.#^<..^^v..^.....vv..v...#^.v>>v#.#.#..#.v.^v<<......^#<.v...v>>^^<^#..^^v.^..^..^...#.#.^...^^<<<...##...v.........^.^.....>>>>>#.....><<<^.....
output:
13
result:
ok single line: '13'
Test #19:
score: 0
Accepted
time: 51ms
memory: 20104kb
input:
500 499 <<<<<#v.^.^v>v<^^.^<>><>^.^v.><^.v^<.^^#..v#>>><<<v^<>>^>>v<<<<^^^^#<>v>^<>>>^>^<<<#^^#v<<<<<<<<v>#v<<v^v.v^<<^<##><<^^<>^<#^^.^#>v^<<^>>>>v^.^>>^<#^>v^#<<<<^><^#.v^>^.^^v<.#^<<<v.v^^^#^<<.>^^#vvv<<^..>#v<.^<<<>>v>>>^.#v#>>#^<<^v<.>^#^.><^<>#^<<^^^^<<<<.><..><<#^<<>>>>>>>^^<>#>v<><#^^><v<><>...
output:
13
result:
ok single line: '13'
Test #20:
score: 0
Accepted
time: 44ms
memory: 19996kb
input:
499 500 v^^.#<^^^..>^.v^<^<<v>^<<^>^#^^v^.>vv<v.>v.^<<<<<.v.^>>v<^#v##<^<<<vv^^^^^.>^v...#>v#.#v^^>^<<>v>>v#<><v>#vv<>>v^.>v<^<v>^#>^<<<>^>v^^..vv<<<v#<<.^^<<.v^<>^<<v^<><<vvv#<<v.##^><vv^>^>^v^##>v>>>^^v.#>^.^.^#.v<<<<^#.^^<^^#.>v.#^<^^^..v<>v<.#.^.v#v^..#>v<vv<<<<<>#v^v.#>#..><>>^...^.#><^>>>>>>>>...
output:
12
result:
ok single line: '12'
Test #21:
score: 0
Accepted
time: 42ms
memory: 20440kb
input:
500 500 ^v>>v>v<>>>^#>v<^<>>>>v<<<^v.>^><.v>v<>^>vv^v>>><.>^v>>#^<<<>^<vv^^>>>v<v.^^v>v<vv<^>vv^<<vv<^^^^>>^^<^>>^^>>#<v^>v>>^<v<#<<vv<<<<<<<<<<<<<<<<<<^^v>^^<^^^v^<<#><<><>^>^>>>v<>>v><<^^<v^v<>>>^<v>>^vv>>v>>>v>v.v.v<v>#^<<<<<<<<<<.>v>^<<<<><^v<>v#<.^>^>^vv.v<>^v#<##^v^>^#v<v<<<<>>>#^>v>>>>>v^^>>^...
output:
11
result:
ok single line: '11'
Test #22:
score: 0
Accepted
time: 11ms
memory: 15460kb
input:
500 500 ######<##############^#####>########v##########v###############################<######<#####>######v########################v####v##########>######v####<##########^#<##################<#####<########v#######<^####^v#####################^v####>#########^###########.v####<##########v##########...
output:
10
result:
ok single line: '10'
Test #23:
score: 0
Accepted
time: 37ms
memory: 20444kb
input:
500 500 <^^<^>><##<v>^>>#<^>v<^v<^^^<<><^^^<^v<^<^^^v#v<<<vv<vv^>>>>>>><vv<<<<>vv^^<^^>><<^<^>^<>^><v>^>^vv>^>^><<^v>^<<>vvv><>>>>>^vv>>#<>>>^^<v<<<^>v^^^<#<<^v^<<>>>>><##^>>#<<<<<<<<^><<<<<<^v^vv.^><>v^^v<v^>vv#^<<<^<<>#>^>>v>^>^^<^>>>^<v<<<v#v^>^^^<^<>^^<vv<<<#>v<v<^v^#^^>>>>^v^^<<>>#>>v<<<<v^<vv>...
output:
14
result:
ok single line: '14'
Test #24:
score: 0
Accepted
time: 2ms
memory: 3780kb
input:
500 2 <v .# .# vv #< v^ <> <^ v. #> ># v^ #< ^# #< >v <> ^. #. << #< >> ># >> #< #v ^# << #^ #v #^ ^. ^# v# ## #> << #^ v^ <v ^# ^> ># .v #^ <# ## .v ># ## ^# ^< ^^ <# .> <^ v< >< <v #v ## #> #> ## ## ^# v> >< .^ v# #^ v> <v ## ## #> >v #v >< .# #. ^# #. ># v< ># #< <^ ^# #. <> #^ .v ## .v .v .# >> ...
output:
6
result:
ok single line: '6'
Test #25:
score: 0
Accepted
time: 2ms
memory: 3644kb
input:
2 500 v##v#>>>>^>>#.##<<.>>^#.v^>^^>##^>^^##v^^#.^<#<###<##v#^>^^.v>v#<^<<##^#^.#<##>#>>#v#>^#vv.^v#>v.####.>#.>>v#<.>#^..#<v##>>>^#v###^<#^#<#^^#>v^>###>>>><#^#v>v.v<^.#v.v##<.####<<<^#>^#^#<#>v#>#>^#>##.>>>^^<##<^^<v<...#v#.#<>>>>#.##.v#<.##.^#<^>#<<vv^>^#^..#<^##^^#<<##.vv<v^#<><.#<<.^^##^.#<v.##...
output:
5
result:
ok single line: '5'
Test #26:
score: 0
Accepted
time: 26ms
memory: 32988kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
31270
result:
ok single line: '31270'
Test #27:
score: 0
Accepted
time: 24ms
memory: 35688kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
123584
result:
ok single line: '123584'
Test #28:
score: 0
Accepted
time: 17ms
memory: 18324kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
331
result:
ok single line: '331'
Test #29:
score: 0
Accepted
time: 21ms
memory: 18392kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
1234
result:
ok single line: '1234'
Test #30:
score: 0
Accepted
time: 14ms
memory: 18332kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
281
result:
ok single line: '281'
Test #31:
score: 0
Accepted
time: 19ms
memory: 18248kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
996
result:
ok single line: '996'