Submission #624510

#	Time	Username	Problem	Language	Result	Execution time	Memory
624510		maomao90	Bodyguard (JOI21_bodyguard)	C++17	0 / 100	2883 ms	2097152 KiB

bodyguard

// Hallelujah, praise the one who set me free
// Hallelujah, death has lost its grip on me
// You have broken every chain, There's salvation in your name
// Jesus Christ, my living hope
#include <bits/stdc++.h> 
using namespace std;

#define REP(i, s, e) for (int i = (s); i < (e); i++)
#define RREP(i, s, e) for (int i = (s); i >= (e); i--)
template <class T>
inline bool mnto(T& a, T b) {return a > b ? a = b, 1 : 0;}
template <class T>
inline bool mxto(T& a, T b) {return a < b ? a = b, 1: 0;}
typedef long long ll;
typedef long double ld;
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
typedef tuple<ll, ll, ll> iii;
#define ALL(_a) _a.begin(), _a.end()
#define SZ(_a) (int) _a.size()
#define pb push_back
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;
typedef vector<iii> viii;

#ifndef DEBUG
#define cerr if (0) cerr
#endif

const int INF = 1000000005;
const ll LINF = 1000000000000000005ll;
const int MAXN = 3005;
const int MAXQ = 3000005;

int n, q;
viii adj[MAXN * 2][MAXN];

ll dist[MAXN * 2][MAXN];
ll dfs(int t, int x) {
    if (dist[t][x] != -1) {
        return dist[t][x];
    }
    //cerr << t << ' ' << x << '\n';
    dist[t][x] = 0;
    for (auto [nt, nx, w] : adj[t][x]) {
        mxto(dist[t][x], dfs(nt, nx) + w);
    }
    return dist[t][x];
}

int main() {
#ifndef DEBUG
    ios::sync_with_stdio(0), cin.tie(0);
#endif
    cin >> n >> q;
    REP (i, 0, n) {
        ll t, a, b, c; cin >> t >> a >> b >> c;
        if (a < b) {
            REP (i, 0, b - a) {
                adj[t + i][a + i].pb({t + i + 1, a + i + 1, c});
                adj[t + i][a + i].pb({t + i + 1, a + i, c / 2});
            }
        } else {
            REP (i, 0, a - b) {
                adj[t + i][a - i].pb({t + i + 1, a - i - 1, c});
                adj[t + i][a - i].pb({t + i + 1, a - i, c / 2});
            }
        }
    }
    REP (i, 0, MAXN * 2 - 1) {
        REP (j, 0, MAXN) {
            if (j + 1 < MAXN) {
                adj[i][j].pb({i + 1, j + 1, 0});
            }
            adj[i][j].pb({i + 1, j, 0});
            if (j) {
                adj[i][j].pb({i + 1, j - 1, 0});
            }
        }
    }
    memset(dist, -1, sizeof dist);
    REP (i, 0, q) {
        int t, x; cin >> t >> x;
        cout << dfs(t, x) << '\n';
    }
    return 0;
}

/*
2 2
1 2 1 4
3 1 3 2
1 2
3 3
*/

• Subtask 1: 0 / 6
• Subtask 2: 0 / 7
• Subtask 3: 0 / 15
• Subtask 4: 0 / 20
• Subtask 5: 0 / 52