제출 #364270

#제출 시각아이디문제언어결과실행 시간메모리
364270super_j6Sailing Race (CEOI12_race)C++14
100 / 100
2112 ms22820 KiB
#include <iostream> #include <cstdio> #include <algorithm> #include <vector> using namespace std; #define endl '\n' #define ll long long #define pi pair<int, int> #define f first #define s second const int mxn = 1000; int n, m; int dp[mxn][mxn][2], dp2[mxn][mxn][2], f[mxn][mxn][2]; vector<int> g[mxn], gr[mxn]; int main(){ ios::sync_with_stdio(0); cin.tie(0); cin >> n >> m; for(int i = 0, x; i < n; i++) for(cin >> x; x; cin >> x) for(int j = 0; j < 2; j++) for(int l = 0; l < 2; l++){ int u = j * n + i, v = l * n + x - 1; if(abs(u - v) < n){ g[u].push_back(v); gr[v].push_back(u); } } for(int i[2] = {0}; i[1] < 2 * n; i[1]++) for(i[0] = i[1]; ~i[0] && i[1] - i[0] < n; i[0]--) for(int j = 0; j < 2; j++){ int dpc = dp[i[0]][i[1]][j], dpc2 = dp2[i[0]][i[1]][j]; if(i[0] != i[1]) f[i[0]][i[1]][j] = max(dpc, f[i[0] + j][i[1] - !j][j]); for(int k : gr[i[j]]) if(k != i[!j]) for(int l = 0, ii[2]; l < 2; l++) if((k > i[l]) == l && abs(k - i[!l]) < n){ ii[l] = k, ii[!l] = i[!l]; int &dpx = dp[ii[0]][ii[1]][l], &dpx2 = dp2[ii[0]][ii[1]][l]; dpx = max(dpx, dpc + 1); if(j == l && (i[0] == i[1] || dpc2)) dpx2 = max(dpx2, dpc2 + 1); } } int ret = 0, x = 0; for(int i[2] = {0}; i[1] < 2 * n; i[1]++) for(i[0] = i[1]; ~i[0] && i[1] - i[0] < n; i[0]--) for(int j = 0; j < 2; j++){ int dpc = dp[i[0]][i[1]][j], dpc2 = dp2[i[0]][i[1]][j]; if(dpc > ret) ret = dpc, x = i[j]; if(m && (i[0] == i[1] || dpc2)){ for(int p = 0, ii[2]; p < 2; p++){ int d = 1 - 2 * (j ^ p), k = -1; for(int l : gr[i[j]]){ if(l != i[p] && (l > i[p]) == p && abs(l - i[!p]) < n && (!~k || d * abs(l - i[!p]) > d * abs(k - i[!p]))){ k = l; } } if(~k) for(int l : g[i[!j]]){ if(l != i[p] && (l > i[p]) == p && abs(l - i[!p]) < n && l != k && (l < k) == j){ ii[p] = l, ii[!p] = ~d ? i[j] : k; int c = f[ii[0] + p][ii[1] - !p][p] + dpc2 + 2; if(c > ret) ret = c, x = k; } } } } } cout << ret << endl; cout << (x % n + 1) << endl; return 0; }
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