제출 #1259639

#제출 시각아이디문제언어결과실행 시간메모리
1259639firegirlwaterboySailing Race (CEOI12_race)C++20
100 / 100
773 ms6584 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; const int MAXN = 501, INF = 1e9; int dp1[MAXN][MAXN][2], dp2[MAXN][MAXN][2], dp3[MAXN][MAXN][2], nx[MAXN][2]; bool adj[MAXN][MAXN]; array<int, 2> ans; void dp(int l, int r, int x) { if (adj[l][r]) { dp1[l][r][x] = 1; dp2[l][r][x] = 1 + dp3[r][nx[l][x]][x ^ 1]; } else dp1[l][r][x] = dp2[l][r][x] = -INF; for (int k = nx[l][x]; k != r; k = nx[k][x]) { dp1[l][r][x] = max(dp1[l][k][x] + dp1[k][r][x], dp1[l][r][x]); dp2[l][r][x] = max(dp1[l][k][x] + dp2[k][r][x], dp2[l][r][x]); } dp3[l][r][x] = max(dp2[l][r][x], dp3[l][nx[r][x ^ 1]][x]); } int main() { ios_base::sync_with_stdio(0); cin.tie(0); int n; bool type; cin >> n >> type; for (int i = 0, x; i < n; i++) { while (cin >> x && x-- != 0) { adj[i][x] = 1; } nx[i][0] = (i + 1) % n; nx[i][1] = (i + n - 1) % n; } for (int d = 1; d < n; d++) { for (int l = 0, r = (l + d) % n; l < n; l++, r = nx[r][0]) { dp(l, r, 0); dp(r, l, 1); } } for (int i = 0; i < n; i++) { for (int j = 0; j < n; j++) { for (int k = 0; k < 2; k++) { ans = max({{dp2[i][j][k], i}, ans}); } } } if (type) { for (int l = 0; l < n; l++) { for (int r = 0; r < n; r++) { for (int x = 0; x < 2; x++) { if (dp1[l][r][x] <= 0) continue; int st = nx[r][x]; while (st != l && !adj[st][l]) { st = nx[st][x]; } if (st == l) continue; for (int ed = nx[st][x]; ed != l; ed = nx[ed][x]) { if (adj[r][ed]) { int num = max(dp3[ed][nx[st][x]][x ^ 1], dp3[ed][nx[l][x ^ 1]][x]); ans = max(ans, {2 + dp1[l][r][x] + num, st}); } } } } } } cout << ans[0] << "\n" << ans[1] + 1; }
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