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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#33311 | #4231. Rafting Trip | flower_and_qingyu# | AC ✓ | 82ms | 30064kb | C++14 | 3.0kb | 2022-05-31 11:15:16 | 2022-05-31 11:15:18 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
int main() {
//freopen("in.txt", "r", stdin);
int n, m;
cin >> n >> m;
vector<string> a(n);
vector<vector<pair<int, int>>> G(n, vector<pair<int, int>> (m));
vector<vector<vector<pair<int, int>>>> E(n, vector<vector<pair<int, int>>> (m));
vector<vector<int>> deg(n, vector<int> (m));
for(int i = 0; i < n; i ++) cin >> a[i];
map<char, pair<int, int>> mp;
mp['^'] = {-1, 0};
mp['<'] = {0, -1};
mp['>'] = {0, 1};
mp['v'] = {1, 0};
constexpr int d[4][2] = {{0, 1}, {0, -1}, {1, 0}, {-1, 0}};
for(int i = 0; i < n; i ++) {
for(int j = 0; j < m; j ++) {
if(mp.count(a[i][j])) {
G[i][j] = {i + mp[a[i][j]].first, j + mp[a[i][j]].second};
if(G[i][j].first >= 0 && G[i][j].first < n && G[i][j].second >= 0 && G[i][j].second < m) {
deg[G[i][j].first][G[i][j].second] ++;
}
}
}
}
queue<pair<int, int>> q;
for(int i = 0; i < n; i ++) for(int j = 0; j < m; j ++) if(mp.count(a[i][j]) && !deg[i][j]) {
q.emplace(i, j);
}
while(!q.empty()) {
auto [x, y] = q.front(); q.pop();
if(!mp.count(a[x][y])) continue;
if(G[x][y].first >= 0 && G[x][y].first < n && G[x][y].second >= 0 && G[x][y].second < m) {
E[G[x][y].first][G[x][y].second].emplace_back(x, y);
if(-- deg[G[x][y].first][G[x][y].second] == 0) {
q.emplace(G[x][y]);
}
}
}
vector<vector<int>> vis(n, vector<int> (m)), use(n, vector<int> (m));
int ans = 0, curans = 0;
auto dfs = [&] (auto &self, int x, int y) -> void {
// cout << curans << '\n';
vector<pair<int, int>> del;
for(int c = 0; c < 4; c ++) {
auto dx = x + d[c][0], dy = y + d[c][1];
if(dx >= 0 && dx < n && dy >= 0 && dy < m &&
a[dx][dy] == '#' && !use[dx][dy]) curans ++, use[dx][dy] = 1, del.emplace_back(dx, dy);
}
ans = max(ans, curans);
for(auto [dx, dy] : E[x][y]) {
self(self, dx, dy);
}
for(auto [dx, dy] : del) {
curans --;
use[dx][dy] = 0;
}
};
for(int i = 0; i < n; i ++) {
for(int j = 0; j < m; j ++) if(deg[i][j] && !vis[i][j]) {
// cout << "------------------\n";
pair<int, int> u = {i, j};
vector<pair<int, int>> cur, c;
while(!vis[u.first][u.second]) {
vis[u.first][u.second] = 1;
for(int c = 0; c < 4; c ++) {
auto dx = u.first + d[c][0], dy = u.second + d[c][1];
if(dx >= 0 && dx < n && dy >= 0 && dy < m &&
a[dx][dy] == '#' && !use[dx][dy]) {
cur.emplace_back(dx, dy), curans ++, use[dx][dy] = 1;
}
}
c.emplace_back(u);
u = G[u.first][u.second];
}
// cout << curans << '\n';
for(auto u : c) {
dfs(dfs, u.first, u.second);
}
for(auto [x, y] : cur) use[x][y] = 0, curans --;
}
}
for(int i = 0; i < n; i ++) for(int j = 0; j < m; j ++) {
if(mp.count(a[i][j]) && (G[i][j].first < 0 || G[i][j].first >= n ||
G[i][j].second < 0 || G[i][j].second >= m || !mp.count(a[G[i][j].first][G[i][j].second]))) {
dfs(dfs, i, j);
}
}
cout << ans << '\n';
return 0;
}
詳細信息
Test #1:
score: 100
Accepted
time: 0ms
memory: 3636kb
input:
5 6 v<<<#v v#v<.> >>v<<< ..v##^ #<<<.^
output:
4
result:
ok single line: '4'
Test #2:
score: 0
Accepted
time: 2ms
memory: 3632kb
input:
4 5 >v<<. ^<..# #...# .#>^#
output:
2
result:
ok single line: '2'
Test #3:
score: 0
Accepted
time: 2ms
memory: 3636kb
input:
4 6 >>v#>v ^#>>^v ^<<#v< .#^<<#
output:
5
result:
ok single line: '5'
Test #4:
score: 0
Accepted
time: 2ms
memory: 3560kb
input:
6 6 ^.>>>> ^..... ^....v ^....v #....v <<<<#v
output:
2
result:
ok single line: '2'
Test #5:
score: 0
Accepted
time: 2ms
memory: 3640kb
input:
6 7 ^>>>>>v ^.....v ^.#^..v ^.#^<.v ^.....v ^<<<<<<
output:
2
result:
ok single line: '2'
Test #6:
score: 0
Accepted
time: 0ms
memory: 3524kb
input:
3 7 >v<<<<# ^<##### #^<<<<<
output:
6
result:
ok single line: '6'
Test #7:
score: 0
Accepted
time: 2ms
memory: 3712kb
input:
3 5 ><.v# ##.^# ...#.
output:
3
result:
ok single line: '3'
Test #8:
score: 0
Accepted
time: 2ms
memory: 3552kb
input:
7 3 ### #># ### ... ### #>. ###
output:
4
result:
ok single line: '4'
Test #9:
score: 0
Accepted
time: 2ms
memory: 3556kb
input:
2 2 >. .#
output:
0
result:
ok single line: '0'
Test #10:
score: 0
Accepted
time: 0ms
memory: 3560kb
input:
2 2 .. .v
output:
0
result:
ok single line: '0'
Test #11:
score: 0
Accepted
time: 56ms
memory: 26036kb
input:
498 498 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<...
output:
41195
result:
ok single line: '41195'
Test #12:
score: 0
Accepted
time: 41ms
memory: 27336kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
24926
result:
ok single line: '24926'
Test #13:
score: 0
Accepted
time: 38ms
memory: 22428kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
24924
result:
ok single line: '24924'
Test #14:
score: 0
Accepted
time: 26ms
memory: 16544kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
2056
result:
ok single line: '2056'
Test #15:
score: 0
Accepted
time: 54ms
memory: 17904kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
970
result:
ok single line: '970'
Test #16:
score: 0
Accepted
time: 56ms
memory: 19108kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
687
result:
ok single line: '687'
Test #17:
score: 0
Accepted
time: 76ms
memory: 19196kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
481
result:
ok single line: '481'
Test #18:
score: 0
Accepted
time: 53ms
memory: 17944kb
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: 82ms
memory: 19356kb
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: 68ms
memory: 19288kb
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: 70ms
memory: 19780kb
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: 13ms
memory: 15576kb
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: 74ms
memory: 19904kb
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: 1ms
memory: 3816kb
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: 3740kb
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: 28ms
memory: 27112kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
31270
result:
ok single line: '31270'
Test #27:
score: 0
Accepted
time: 24ms
memory: 30064kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
123584
result:
ok single line: '123584'
Test #28:
score: 0
Accepted
time: 32ms
memory: 18860kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
331
result:
ok single line: '331'
Test #29:
score: 0
Accepted
time: 36ms
memory: 18944kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
1234
result:
ok single line: '1234'
Test #30:
score: 0
Accepted
time: 39ms
memory: 18912kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
281
result:
ok single line: '281'
Test #31:
score: 0
Accepted
time: 31ms
memory: 18836kb
input:
500 500 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
output:
996
result:
ok single line: '996'