Submission #140275

#	Time	Username	Problem	Language	Result	Execution time	Memory
140275		egorlifar	Sailing Race (CEOI12_race)	C++17	100 / 100	2205 ms	2656 KiB

race

/*
ЗАПУСКАЕМ
░ГУСЯ░▄▀▀▀▄░РАБОТЯГУ░░
▄███▀░◐░░░▌░░░░░░░
░░░░▌░░░░░▐░░░░░░░
░░░░▐░░░░░▐░░░░░░░
░░░░▌░░░░░▐▄▄░░░░░
░░░░▌░░░░▄▀▒▒▀▀▀▀▄
░░░▐░░░░▐▒▒▒▒▒▒▒▒▀▀▄
░░░▐░░░░▐▄▒▒▒▒▒▒▒▒▒▒▀▄
░░░░▀▄░░░░▀▄▒▒▒▒▒▒▒▒▒▒▀▄
░░░░░░▀▄▄▄▄▄█▄▄▄▄▄▄▄▄▄▄▄▀▄
░░░░░░░░░░░▌▌░▌▌░░░░░
░░░░░░░░░░░▌▌░▌▌░░░░░
░░░░░░░░░▄▄▌▌▄▌▌░░░░░
 */
#include <iostream>
#include <complex>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <numeric>
#include <cstring>
#include <ctime>
#include <cstdlib>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <list>
#include <cmath>
#include <bitset>
#include <cassert>
#include <queue>
#include <stack>
#include <deque>
#include <random>
 
using namespace std;
template<typename T1, typename T2>inline void chkmin(T1 &x, T2 y) { x = (x > y ? y: x);}
template<typename T1, typename T2>inline void chkmax(T1 &x, T2 y) { x = (x < y ? y: x);}
#define sz(c) (int)(c).size()
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define left left224
#define right right224
#define next next224
#define rank rank224
#define prev prev224
#define y1 y1224
#define read(FILENAME) freopen((FILENAME + ".in").c_str(), "r", stdin)
#define write(FILENAME) freopen((FILENAME + ".out").c_str(), "w", stdout)
#define files(FILENAME) read(FILENAME), write(FILENAME)
#define pb push_back
#define mp make_pair
const string FILENAME = "input";
const int MAXN = 501;

int n, t;
bitset<501> b[MAXN];
int dp[MAXN][MAXN][2];
int dp1[MAXN][MAXN][2];
int dp2[MAXN];
int curm[MAXN];


int dist(const int &i, const int &j) {
    return (j >= i ? j - i: n - i + j);
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    //read(FILENAME); 
    cin >> n >> t;
    for (int i = 0; i < n; i++) {
        int a;
        while (cin >> a) {
            if (a == 0) {
                break;
            }
            b[i][a - 1] = true;
        }
    }
    for (int len = 1; len <= n - 1; len++) {
        for (int i = 0; i < n; i++) {
            int j = (i + len) % n;
            for (int t = 0; t < 2; t++) {
                int cur = (t == 0 ? i: j);
                for (int k = 0; k <= len; k++) {
                    int g = (i + k >= n ? i + k - n: i + k);
                    if (g != cur) {
                        if (b[cur][g]) {
                            chkmax(dp[len][i][t], dp[k - (cur == i ? 1: 0)][(i == cur ? (i + 1) % n: i)][1] + 1);
                            chkmax(dp[len][i][t], dp[(len - k) - (cur == j ? 1: 0)][g][0] + 1);
                        }
                    }
                }
            }
        }
    }
    if (t == 0) {
        int res = 0;
        int pos = -1;
        for (int i =  0; i < n; i++) {
            chkmax(res, dp[n - 1][i][0]);
            if (res == dp[n - 1][i][0]) {
                pos = i;
            }
            chkmax(res, dp[n - 1][i][1]);
            if (res == dp[n - 1][i][1]) {
                pos = (i + n - 1) % n;
            }
        }
        cout << res << endl;
        cout << pos + 1 << endl;
        return 0;
    }
    int res = 0;
    int pos = -1;
    for (int i =  0; i < n; i++) {
        chkmax(res, dp[n - 1][i][0]);
        if (res == dp[n - 1][i][0]) {
            pos = i;
        }
        chkmax(res, dp[n - 1][i][1]);
        if (res == dp[n - 1][i][1]) {
            pos = (i + n - 1) % n;
        }
    }
    for (int j = 0; j < n; j++) {
        memset(curm, 0, sizeof(curm));
        vector<int> g;
        g.pb(j);
        memset(dp2, 0, sizeof(dp2));
        dp2[j] = 2;
        for (int is = 2; is < n; is++) {
            int i = (j + is) % n;
            int f = (j + is - 1) % n;
            for (auto x: g) {
                if (b[x][f]) {
                    chkmax(dp2[f], dp2[x] + 1);
                }
            }
            for (int j = 0; j < n; j++) {
                if (b[f][j]) {
                    chkmax(curm[j], dp2[f]);
                }
            }
            g.pb(f);
            if (!b[i][j]) {
                continue;
            }
            int i1 = (i + 1) % n;
            for (int k = is + 1; k < n; k++) {
                int t = (j + k);
                if (t >= n) {
                    t -= n;
                } 
                int len = max(dp[n - k - 1][t][0], dp[k - is - 1][i1][1]);
                if (len + curm[t] > res && curm[t] > 2) {
                    res = len + curm[t];
                    pos = i;
                }
            }
        }
    }
    for (int j = 0; j < n; j++) {
        memset(curm, 0, sizeof(curm));
        vector<int> g;
        g.pb(j);
        memset(dp2, 0, sizeof(dp2));
        dp2[j] = 2;
        int j1 = (j + 1) % n;
        for (int is = 2; is < n; is++) {
            int i = (j - is + n) % n;
            int f = (j - is + 1 + n) % n;
            for (auto x: g) {
                if (b[x][f]) {
                    chkmax(dp2[f], dp2[x] + 1);
                }
            }
            for (int j = 0; j < n; j++) {
                if (b[f][j]) {
                    chkmax(curm[j], dp2[f]);
                }
            }
            g.pb(f);
            if (!b[i][j]) {
                continue;
            }
            for (int k = is + 1; k < n; k++) {
                int t = (j - k);
                if (t < 0) {
                    t += n;
                } 
                int len = max(dp[k - is - 1][t][0], dp[n - k - 1][j1][1]);
                if (len + curm[t] > res && curm[t] > 2) {
                    res = len + curm[t];
                    pos = i;
                }
            }
        }
    }
    cout << res << endl;
    cout << pos + 1 << endl;
    return 0; 
}

• Subtask 1: 100 / 100