#include<bits/stdc++.h>
//#define int long long
#define pb push_back
#define fast ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
#define MOD 1000000007
#define inf 1e18
#define fi first
#define se second
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define FORD(i,a,b) for(int i=a;i>=b;i--)
#define sz(a) ((int)(a).size())
#define endl '\n'
#define pi 3.14159265359
#define TASKNAME "sailrace"
template<typename T> bool maximize(T &res, const T &val) { if (res < val){ res = val; return true; }; return false; }
template<typename T> bool minimize(T &res, const T &val) { if (res > val){ res = val; return true; }; return false; }
using namespace std;
typedef pair<int,int> ii;
typedef pair<int,ii> iii;
typedef vector<int> vi;
const int MAXN = 3e5 + 9;
string str;
int n, k;
vector<int> g[MAXN];
void extract(int curId){
int num = 0;
// cout << str << endl;
str = str + ' ';
for(int i = 0; i < str.length(); i++){
if (str[i] != ' ') {
num = num * 10 + (str[i] - '0');
// cout << num << ' ' << str[i] - '0' << endl;
}
else {
if (num != 0) {
g[curId].pb(num);
// cout << curId << ' ' << num << endl;
}
else break;
num = 0;
}
}
}
namespace subtask1{
bool check(){
return k == 0;
}
int dp[2][502][502], backward = 0;
int goBack(int id){
return (id - backward <= 0) ? id - backward + n : (id - backward);
}
int goUp(int id){
return (id + backward) - ((id + backward > n) ? (n) : 0);
}
int memo(int state, int Larc, int Rarc){
int mx = 0;
for(int len = n; len >= 1; len--){
for(int Larc = 1, Rarc = Larc + len - 1; Rarc <= n; Rarc++, Larc++){
for(int state = 0; state < 2; state++){
int cur = goUp((state) ? Rarc : Larc);
if (dp[state][Larc][Rarc] < 0) continue;
// cout << cur << ' ' << state << ' ' << Larc << ' ' << Rarc << ' ' << dp[state][Larc][Rarc] << endl;
if (state == 0){
for(auto v: g[cur]){
int curV = goBack(v);
if (curV > Larc and curV <= Rarc) {
// maximize(dp[0][Larc][Rarc], 1 + max(memo(0, curV, Rarc), memo(1, Larc + 1, curV)));
maximize(dp[0][curV][Rarc], dp[0][Larc][Rarc] + 1);
maximize(dp[1][Larc + 1][curV], dp[0][Larc][Rarc] + 1);
}
}
}
else{
for(auto v: g[cur]){
int curV = goBack(v);
if (curV >= Larc and curV < Rarc) {
// maximize(dp[1][Larc][Rarc], 1 + max(memo(0, curV, Rarc - 1), memo(1, Larc, curV)));
maximize(dp[0][curV][Rarc - 1], dp[1][Larc][Rarc] + 1);
maximize(dp[1][Larc][curV], dp[1][Larc][Rarc] + 1);
}
}
}
}
}
}
for(int i = 1; i <= n; i++){
for(int j = 1; j <= n; j++){
maximize(mx, dp[0][i][j]);
maximize(mx, dp[1][i][j]);
}
}
return mx;
}
void solve(){
int bestI = 0, res = 0;
for(int i = 1;i <= n; i++){
memset(dp, -0x3f, sizeof(dp));
backward = i - 1;
dp[0][1][n] = 0;
int mx = memo(0, 1, n);
if (maximize(res, mx)){
bestI = i;
}
}
cout << res << endl;
}
}
main()
{
fast;
if (fopen(TASKNAME".inp","r")){
freopen(TASKNAME".inp","r",stdin);
freopen(TASKNAME".out","w",stdout);
}
cin >> n >> k;
cin.ignore();
for(int i = 1; i <= n; i++){
getline(cin, str);
extract(i);
}
if (subtask1::check()) return subtask1::solve(), 0;
subtask1::solve();
}
/**
Warning:
- MLE / TLE?
- Gioi han mang?
- Gia tri max phai luon gan cho -INF
- long long co can thiet khong?
- tran mang.
- code can than hon
- Nho sinh test de tranh RTE / TLE
--> Coi lai truoc khi nop
**/
Compilation message
race.cpp: In function 'void extract(int)':
race.cpp:30:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
30 | for(int i = 0; i < str.length(); i++){
| ~~^~~~~~~~~~~~~~
race.cpp: In function 'void subtask1::solve()':
race.cpp:109:13: warning: variable 'bestI' set but not used [-Wunused-but-set-variable]
109 | int bestI = 0, res = 0;
| ^~~~~
race.cpp: At global scope:
race.cpp:123:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
123 | main()
| ^~~~
race.cpp: In function 'int main()':
race.cpp:127:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
127 | freopen(TASKNAME".inp","r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
race.cpp:128:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
128 | freopen(TASKNAME".out","w",stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
5 ms |
9308 KB |
Unexpected end of file - int32 expected |
| 2 |
Incorrect |
6 ms |
9308 KB |
Output isn't correct |
| 3 |
Incorrect |
6 ms |
9308 KB |
Output isn't correct |
| 4 |
Incorrect |
7 ms |
9308 KB |
Output isn't correct |
| 5 |
Incorrect |
12 ms |
9484 KB |
Unexpected end of file - int32 expected |
| 6 |
Incorrect |
15 ms |
9488 KB |
Output isn't correct |
| 7 |
Incorrect |
43 ms |
9312 KB |
Unexpected end of file - int32 expected |
| 8 |
Incorrect |
24 ms |
9560 KB |
Output isn't correct |
| 9 |
Incorrect |
79 ms |
9308 KB |
Unexpected end of file - int32 expected |
| 10 |
Incorrect |
137 ms |
9304 KB |
Unexpected end of file - int32 expected |
| 11 |
Incorrect |
123 ms |
9504 KB |
Unexpected end of file - int32 expected |
| 12 |
Incorrect |
661 ms |
9308 KB |
Output isn't correct |
| 13 |
Incorrect |
1633 ms |
9524 KB |
Output isn't correct |
| 14 |
Execution timed out |
3056 ms |
9564 KB |
Time limit exceeded |
| 15 |
Execution timed out |
3074 ms |
9564 KB |
Time limit exceeded |
| 16 |
Execution timed out |
3084 ms |
9824 KB |
Time limit exceeded |
| 17 |
Execution timed out |
3018 ms |
9560 KB |
Time limit exceeded |
| 18 |
Execution timed out |
3044 ms |
9560 KB |
Time limit exceeded |
| 19 |
Execution timed out |
3078 ms |
9820 KB |
Time limit exceeded |
| 20 |
Execution timed out |
3094 ms |
9816 KB |
Time limit exceeded |
