제출 #676291

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
676291		Do_you_copy	Domino (COCI15_domino)	C++17	100 / 160	755 ms	524288 KiB

domino

#include <bits/stdc++.h>
#define taskname "test"
#define fi first
#define se second
#define pb push_back
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
using namespace std;
using ll = long long;
using ull = unsigned ll;
using ld = long double;
using pii = pair <int, int>;
using pil = pair <int, ll>;
using pli = pair <ll, int>;
using pll = pair <ll, ll>;
mt19937 Rand(chrono::steady_clock::now().time_since_epoch().count());

ll min(const ll &a, const ll &b){
    return (a < b) ? a : b;
}

ll max(const ll &a, const ll &b){
    return (a > b) ? a : b;
}

//const ll Mod = 1000000007;
//const ll Mod2 = 999999999989;
//only use when required
const int maxN = 3e3 + 1;
const int inf = 0x3f3f3f3f;
int dx[] = {0, 0, 1, -1};
int dy[] = {1, -1, 0, 0};
int n, m, k;
int s, t;
int d[maxN * maxN];
struct TEdge{
    int u, v, c, w;
    TEdge(){}
    TEdge(int _u, int _v, int _c, int _w){
        u = _u;
        v = _v;
        c = _c;
        w = _w;
    }
};

vector <int> adj[maxN * maxN];
vector <TEdge> S;
int a[maxN][maxN];
bool inqueue[maxN * maxN];
int trace[maxN * maxN];
inline int conv(int i, int j){
    return (i - 1) * m + j;
}

inline void add(int u, int v, int w){
    adj[u].pb(S.size());
    S.pb({u, v, 1, w});
    adj[v].pb(S.size());
    S.pb({v, u, 0, -w});
}

void SPFA(){
    fill(d, d + n * m + 2, inf);
    d[0] = 0;
    queue <int> Q;
    Q.push(0);
    while (!Q.empty()){
        int u = Q.front();
        inqueue[u] = 0;
        Q.pop();
        for (int i: adj[u]){
            int c = S[i].c, v = S[i].v, w = S[i].w;
            if (c && d[v] > d[u] + w){
                d[v] = d[u] + w;
                trace[v] = i;
                if (!inqueue[v]){
                    inqueue[v] = 1;
                    Q.push(v);
                }
            }
        }
    }
}


void Init(){
    cin >> n >> k;
    m = n;
    s = 0, t = n * m + 1;
    for (int i = 1; i <= n; ++i){
        for (int j = 1; j <= m; ++j) cin >> a[i][j];
    }
    ll res = 0;
    for (int i = 1; i <= n; ++i){
        for (int j = 1; j <= m; ++j){
            res += a[i][j];
            if ((i + j) % 2){
                add(s, conv(i, j), 0);
                for (int k = 0; k < 4; ++k){
                    int x = i + dx[k];
                    int y = j + dy[k];
                    if (x < 1 || x > n || y < 1 || y > m) continue;
                    add(conv(i, j), conv(x, y), -a[i][j] - a[x][y]);
                }
            }
            else add(conv(i, j), t, 0);
        }
    }
    while (k--){
        SPFA();
        int v = t;
        res += d[v];
        while (v){
            int i = trace[v];
            S[i].c ^= 1;
            S[i ^ 1].c ^= 1;
            v = S[i].u;
        }
    }
    cout << res;
}


int main(){
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }
    faster;
    ll tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
}

컴파일 시 표준 에러 (stderr) 메시지

domino.cpp: In function 'int main()':
domino.cpp:126:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  126 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
domino.cpp:127:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  127 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 10 / 10
• Subtask 5: 0 / 10
• Subtask 6: 10 / 10
• Subtask 7: 0 / 10
• Subtask 8: 10 / 10
• Subtask 9: 0 / 10
• Subtask 10: 10 / 10
• Subtask 11: 10 / 10
• Subtask 12: 0 / 10
• Subtask 13: 10 / 10
• Subtask 14: 10 / 10
• Subtask 15: 10 / 10
• Subtask 16: 0 / 10