Submission #1045902

#	Time	Username	Problem	Language	Result	Execution time	Memory
1045902		c2zi6	Toy (CEOI24_toy)	C++14	0 / 100	46 ms	1036 KiB

Main

#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define replr(i, a, b) for (int i = int(a); i <= int(b); ++i)
#define reprl(i, a, b) for (int i = int(a); i >= int(b); --i)
#define rep(i, n) for (int i = 0; i < int(n); ++i)
#define mkp(a, b) make_pair(a, b)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef vector<int> VI;
typedef vector<PII> VPI;
typedef vector<VI> VVI;
typedef vector<VVI> VVVI;
typedef vector<VPI> VVPI;
typedef pair<ll, ll> PLL;
typedef vector<ll> VL;
typedef vector<PLL> VPL;
typedef vector<VL> VVL;
typedef vector<VVL> VVVL;
typedef vector<VPL> VVPL;
template<class T> T setmax(T& a, T b) {if (a < b) return a = b; return a;}
template<class T> T setmin(T& a, T b) {if (a < b) return a; return a = b;}
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template<class T>
using indset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef vector<char> VC;
typedef vector<VC> VVC;
typedef vector<bool> VB;
typedef vector<VB> VVB;
 
int n, m;
int K, L;

void replace(VVC& table, char a, char b) {
    rep(i, n) rep(j, m) if (table[i][j] == a) table[i][j] = b;
}

const int MAXN = 300;

bool aexist[MAXN][MAXN];
bool bexist[MAXN][MAXN];

VPI harevan(int x, int y) {
    VPI ret;
    ret.pb({x-1, y});
    ret.pb({x+1, y});
    ret.pb({x, y-1});
    ret.pb({x, y+1});
    VPI ret2;
    for (auto[x, y] : ret) {
        if (x < 0 || x >= n) continue;
        if (y < 0 || y >= m) continue;
        ret2.pb({x, y});
    }
    return ret2;
}

void solve() {
    cin >> m >> n >> K >> L;
    // K - width, L - height
    rep(i, n) rep(j, m) aexist[i][j] = bexist[i][j] = 0;
    int hx, hy, vx, vy;
    cin >> hy >> hx >> vy >> vx;
    VVC table, a, b;
    table = a = b = VVC(n, VC(m, 'X'));
    rep(i, n) rep(j, m) cin >> table[i][j];
    int destx, desty;
    rep(i, n) rep(j, m) {
        if (table[i][j] == '*') {
            destx = i;
            desty = j;
            table[i][j] = '.';
            break;
        }
    }
    rep(i, n) rep(j, m) {
        if (j+K-1 < m) {
            bool can = true;
            replr(c, j, j+K-1) {
                if (table[i][c] == 'X') can = false;
            }
            if (can) a[i][j] = '.';
        }
        if (i+L-1 < n) {
            bool can = true;
            replr(r, i, i+L-1) {
                if (table[r][j] == 'X') can = false;
            }
            if (can) b[i][j] = '.';
        }
    }
    /*cout << endl << "possible moves horizontal" << endl;*/
    /*rep(i, n) {*/
    /*    rep(j, m) cout << a[i][j];*/
    /*    cout << endl;*/
    /*}*/
    /*cout << endl << "possible moves vertical" << endl;*/
    /*rep(i, n) {*/
    /*    rep(j, m) cout << b[i][j];*/
    /*    cout << endl;*/
    /*}*/
    stack<PII> ast;
    stack<PII> bst;
    ast.push({hx, hy});
    bst.push({vx, vy});
    aexist[hx][hy] = true;
    bexist[vx][vy] = true;
    while (ast.size() || bst.size()) {
        while (ast.size()) {
            auto[ax, ay] = ast.top();
            ast.pop();
            /*cout << "PROCESSING HORIZONTAL AT (" << ax << ", " << ay << ")" << endl;*/

            int MINX = max(0, ax-L+1);
            int MAXX = ax;
            int MINY = ay;
            int MAXY = ay+K-1;

            while (true) {
                bool repeat = false;
                replr(x, MINX, MAXX) {
                    replr(y, MINY, MAXY) {
                        if (b[x][y] != 'X' && !bexist[x][y]) {
                            bool canbe = false;
                            for (auto[vx, vy] : harevan(x, y)) {
                                if (MINX <= vx && vx <= MAXX && MINY <= vy && vy <= MAXY) {
                                    if (bexist[vx][vy]) canbe = true;
                                }
                            }
                            if (canbe) {
                                /*cout << "   IT TURNS OUT THAT VERTICAL CAN BE AT (" << x << ", " << y << ")" << endl;*/
                                bst.push({x, y});
                                bexist[x][y] = true;
                                repeat = true;
                            }
                        }
                    }
                }
                if (!repeat) break;
            }
        }
        while (bst.size()) {
            auto[bx, by] = bst.top();
            bst.pop();
            /*cout << "PROCESSING VERTICAL AT (" << bx << ", " << by << ")" << endl;*/
            int MINX = bx;
            int MAXX = min(n-1, bx+L-1);
            int MINY = max(by-K+1, 0);
            int MAXY = by;
            while (true) {
                bool repeat = false;
                replr(x, MINX, MAXX) {
                    replr(y, MINY, MAXY) {
                        if (a[x][y] != 'X' && !aexist[x][y]) {
                            bool canbe = false;
                            for (auto[vx, vy] : harevan(x, y)) {
                                if (MINX <= vx && vx <= MAXX && MINY <= vy && vy <= MAXY) {
                                    if (aexist[vx][vy]) canbe = true;
                                }
                            }
                            if (canbe) {
                                /*cout << "   IT TURNS OUT THAT HORIZONTAL CAN BE AT (" << x << ", " << y << ")" << endl;*/
                                ast.push({x, y});
                                aexist[x][y] = true;
                                repeat = true;
                            }
                        }
                    }
                }
                if (!repeat) break;
            }
        }
    }
    /*cout << "Horizontal can be in " << endl;*/
    /*rep(x, n) rep(y, m) if (aexist[x][y]) {*/
    /*    cout << "(" << x << ", " << y << ")" << endl;*/
    /*}*/
    /*cout << "Vertical can be in " << endl;*/
    /*rep(x, n) rep(y, m) if (bexist[x][y]) {*/
    /*    cout << "(" << x << ", " << y << ")" << endl;*/
    /*}*/

    bool p1 = false;
    rep(y, m) if (aexist[destx][y]) {
        if (desty-K+1 <= y && y <= desty) {
            p1 = true;
            break;
        }
    }
    bool p2 = false;
    rep(x, n) if (bexist[x][desty]) {
        if (destx-L+1 <= x && x <= destx) {
            p2 = true;
            break;
        }
    }
    if (p1 && p2) cout << "YES" << endl;
    else cout << "NO" << endl;
}
 
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL), cout.tie(NULL);
	/*freopen("mincross.in", "r", stdin); */
	/*freopen("test.out", "w", stdout); */
	int t = 1;
	//cin >> t; 
	while (t--) solve();
}

Compilation message (stderr)

Main.cpp: In function 'VPI harevan(int, int)':
Main.cpp:56:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   56 |     for (auto[x, y] : ret) {
      |              ^
Main.cpp: In function 'void solve()':
Main.cpp:116:17: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  116 |             auto[ax, ay] = ast.top();
      |                 ^
Main.cpp:131:38: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  131 |                             for (auto[vx, vy] : harevan(x, y)) {
      |                                      ^
Main.cpp:149:17: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  149 |             auto[bx, by] = bst.top();
      |                 ^
Main.cpp:162:38: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  162 |                             for (auto[vx, vy] : harevan(x, y)) {
      |                                      ^
Main.cpp:73:9: warning: 'destx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   73 |     int destx, desty;
      |         ^~~~~
Main.cpp:73:16: warning: 'desty' may be used uninitialized in this function [-Wmaybe-uninitialized]
   73 |     int destx, desty;
      |                ^~~~~

• Subtask 0: 0 / 0
• Subtask 1: 0 / 14
• Subtask 2: 0 / 21
• Subtask 3: 0 / 9
• Subtask 4: 0 / 29
• Subtask 5: 0 / 27