Submission #638324

#	Time	Username	Problem	Language	Result	Execution time	Memory
638324		4EVER	Maja (COCI18_maja)	C++11	110 / 110	399 ms	588 KiB

maja

#include <bits/stdc++.h>
//#pragma GCC optimize("O2")
//#pragma GCC target("avx,avx2,fma")
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

#define PB push_back
#define ALL(i_) i_.begin(), i_.end()
#define LOG2(x) (31 - __builtin_clz(x))
#define getBit(x, i) ((x >> i) & 1)
#define rd(l, r) (l + rng() % (r - l + 1))

typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;

template<class X, class Y> bool minimize(X &x, const Y &y){
    X eps = 1e-9;
    if (x > y + eps) {
        x = y;
        return 1;
    }
    return 0;
}

template<class X, class Y> bool maximize(X &x, const Y &y) {
    X eps = 1e-9;
    if (x + eps < y) {
        x = y;
        return 1;
    }
    return 0;
}

template<class T> T Abs(const T &x) { return (x < 0 ? -x : x); }

const int mod = (int) 1e9 + 7;
const int oo = (int) 1e9 + 99;
const int maxn = (int) 1e5 + 11;
const int LOG = (int) 20;
const ii dxy[] = { {-1, 0}, {1, 0}, {0, 1}, {0, -1} };

int n, m, k, sta_x, sta_y;
int a[101][101];
ll dp[2][101][101];

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #define TASK "MAJA"
    if(fopen(TASK".inp", "r")) {
        freopen(TASK".inp", "r", stdin);
        freopen(TASK".out", "w", stdout);
    }
    cin >> n >> m >> sta_x >> sta_y >> k;
    for(int i = 1; i <= n; i++) for(int j = 1; j <= m; j++) cin >> a[i][j];
    memset(dp, -1, sizeof dp);
    dp[0][sta_x][sta_y] = 0;
    k >>= 1;
    int step = min(k, n * m);
    for(int t = 0; t < step; t++){
        int cur = t & 1;
        int nxt = !cur;
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <= m; j++) if(dp[cur][i][j] != -1){
                for(int d = 0; d < 4; d++){
                    int u = i + dxy[d].first;
                    int v = j + dxy[d].second;
                    if(u >= 1 && u <= n && v >= 1 && v <= m){
                        maximize(dp[nxt][u][v], dp[cur][i][j] + a[u][v]);
                    }
                }
            }
        }
        memset(dp[cur], -1, sizeof dp[cur]);
    }

    ll res = 0;

    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            int rem = k - step;

            for(int d = 0; d < 4; d++){
                int u = i + dxy[d].first;
                int v = j + dxy[d].second;
                if(u >= 1 && u <= n && v >= 1 && v <= m){
                    ll val = a[i][j] + a[u][v];
                    maximize(res, 2ll * dp[step & 1][i][j] + 1ll * rem * val - a[i][j]);
                }
            }

        }
    }

    cout << res;
    return 0;
}

Compilation message (stderr)

maja.cpp: In function 'int main()':
maja.cpp:51:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |         freopen(TASK".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
maja.cpp:52:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |         freopen(TASK".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 11 / 11
• Subtask 3: 11 / 11
• Subtask 4: 11 / 11
• Subtask 5: 11 / 11
• Subtask 6: 11 / 11
• Subtask 7: 11 / 11
• Subtask 8: 11 / 11
• Subtask 9: 11 / 11
• Subtask 10: 11 / 11