Submission #1114265

#	Time	Username	Problem	Language	Result	Execution time	Memory
1114265		ljtunas	Pohlepko (COCI16_pohlepko)	C++14	80 / 80	108 ms	9544 KiB

pohlepko

// author : anhtun_hi , nqg
#include <bits/stdc++.h>
#define ll long long
#define ii pair<ll, ll>
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define reset(h, v)    memset(h, v, sizeof h)
#define Forv(i, a)     for(auto& i : a)
#define For(i, a, b)   for(int i = a; i <= b; ++i)
#define Ford(i, a, b)  for(int i = a; i >= b; --i)
#define c_bit(i)     __builtin_popcountll(i)
#define Bit(mask, i)    ((mask >> i) & 1LL)
#define onbit(mask, i)  ((mask) bitor (1LL << i))
#define offbit(mask, i) ((mask) &~ (1LL << i))
using namespace std;
namespace std {
    template <typename T, int D>
    struct _vector : public vector <_vector <T, D - 1>> {
        static_assert(D >= 1, "Dimension must be positive!");
        template <typename... Args>
        _vector(int n = 0, Args... args) : vector <_vector <T, D - 1>> (n, _vector <T, D - 1> (args...)) {}
    };
    template <typename T> struct _vector <T, 1> : public vector <T> {
        _vector(int n = 0, const T& val = T()) : vector <T> (n, val) {}
    };
    template <class A, class B> bool minimize(A &a, B b){return a > b ? a = b, true : false;}
    template <class A, class B> bool maximize(A &a, B b){return a < b ? a = b, true : false;}
}
const int dx[] = {0, 0, +1, -1}, dy[] = {-1, +1, 0, 0}, LOG = 20, base = 311, inf = 1e9 + 5;
const int MAXN = 1e6 + 5;
const  ll  mod = 1e9 + 7;
const  ll   oo = 1e18;

#define int long long
int n, m;
vector<vector<char>> a;
//vector<vector<char>> d;
char d[1000000 + 5];
vector<vector<bool>> vs, ok;
vector<vector<ii>> trace;

struct Node{
    int x, y; char val;
};


struct cmp {
    bool operator() (const Node &A, const Node &B) {
        if(A.x + A.y == B.x + B.y) return A.val - 'a' > B.val - 'a';
        return A.x + A.y > B.x + B.y;
    }
};

void Solve() {
    cin >> n >> m;
    a.resize(n + 5, vector<char>(m + 5));
    vs.resize(n + 5, vector<bool>(m + 5, 0));
    ok.resize(n + 5, vector<bool>(m + 5, 0));
    For(i, 1, n) For(j, 1, m) {
        cin >> a[i][j];
        if(a[i][j] == '#') a[i][j] = '{';
        d[i + j - 1] = '{';
    }
    queue<ii> q;
    q.push({n, m});
    while(q.size()){
        auto [x, y] = q.front();
        vs[x][y] = true;
        q.pop();
        for (int k : {0, 3}){
            int u = x + dx[k];
            int v = y + dy[k];
            if(1 <= u && u <= n && 1 <= v && v <= m && a[u][v] != '{'){
                if(!vs[u][v]) vs[u][v] = true, q.push({u, v});
            }
        }
    }
    priority_queue<Node, vector<Node>, cmp> pq;
    pq.push({1, 1, a[1][1]});
    while(pq.size()){
        auto [x, y, val] = pq.top(); pq.pop();
        if (d[x + y - 1] == '{') {
            d[x + y - 1] = val;
        }
        else if (a[x][y] != d[x + y - 1]) continue;
        ok[x][y] = true;
        for(int k : {1, 2}){
            int u = x + dx[k];
            int v = y + dy[k];
            if(1 <= u && u <= n && 1 <= v && v <= m && vs[u][v] == true){
                if (!ok[u][v]){
                    ok[u][v] = true;
                    pq.push({u, v, a[u][v]});
                }
            }
        }
    }
    For(i, 1, n + m - 1) cout << d[i];
}

int32_t main() {
    cin.tie(0) -> sync_with_stdio(0);
    if(fopen("b.inp", "r")) {
        freopen("b.inp", "r", stdin);
        freopen("b.out", "w", stdout);
    }

    int t = 1;
//    cin >> t;

    for (int test = 1; test <= t; test++) {
        Solve();
    }
    return 0;
}

Compilation message (stderr)

pohlepko.cpp: In function 'void Solve()':
pohlepko.cpp:68:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   68 |         auto [x, y] = q.front();
      |              ^
pohlepko.cpp:82:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   82 |         auto [x, y, val] = pq.top(); pq.pop();
      |              ^
pohlepko.cpp: In function 'int32_t main()':
pohlepko.cpp:105:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  105 |         freopen("b.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
pohlepko.cpp:106:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  106 |         freopen("b.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 80 / 80