제출 #1038398

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1038398		c2zi6	Rectangles (IOI19_rect)	C++14	0 / 100	5057 ms	157780 KiB

rect

#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>;
#include "rect.h"

namespace TEST1 {
    int lg[3001];
    struct SPARSETABLE {
        VVI table;
        SPARSETABLE(){};
        SPARSETABLE(VI a) {
            int n = a.size();
            table = VVI(n, VI(14));
            reprl(i, n-1, 0) {
                table[i][0] = a[i];
                for (int j = 1; i+(1<<(j-1)) < n; j++) {
                    table[i][j] = max(table[i][j-1], table[i + (1<<(j-1))][j-1]);
                }
            }
        }
        int get(int l, int r) {
            int s = lg[r - l + 1];
            return max(table[l][s], table[r-(1<<s)+1][s]);
        }
    };
    ll count_rectangles(VVI a) {
        lg[1] = 0; replr(i, 2, 3000) lg[i] = lg[i/2]+1;
        int n = a.size();
        int m = a[0].size();
        vector<SPARSETABLE> rows(n);
        vector<SPARSETABLE> cols(m);
        rep(i, n) {
            rows[i] = SPARSETABLE(a[i]);
        }
        rep(j, m) {
            VI b;
            rep(i, n) b.pb(a[i][j]);
            cols[j] = SPARSETABLE(b);
        }
        ll ans = 0;
        replr(r1, 1, n-2) replr(r2, r1, n-2) {
            replr(c1, 1, m-2) replr(c2, c1, m-2) {
                bool good = true;
                replr(i, r1, r2) {
                    if (rows[i].get(c1, c2) >= min(a[i][c1-1], a[i][c2+1])) {
                        good = false;
                        break;
                    }
                }
                if (!good) continue;
                replr(j, c1, c2) {
                    if (cols[j].get(r1, r2) >= min(a[r1-1][j], a[r2+1][j])) {
                        good = false;
                        break;
                    }
                }
                if (!good) continue;
                /*cout << r1 << " " << r2 << " " << c1 << " " << c2 << endl;*/
                ans++;
            }
        }
        return ans;
    }
}
namespace TEST6 {
    bool check(VVI a) {
        for (VI& vec : a) for (int x : vec) if (x > 1) return false;
        return true;
    }
    int n, m;
    int r1, r2, c1, c2;
    VPI harevan(int ux, int uy) {
        return VPI{{ux-1, uy}, {ux+1, uy}, {ux, uy-1}, {ux, uy+1}};
    }
    void dfs(int ux, int uy, VVI& a) {
        VPI harevan = {{ux-1, uy}, {ux+1, uy}, {ux, uy-1}, {ux, uy+1}};
        a[ux][uy] = 2;
        setmin(r1, ux);
        setmax(r2, ux);
        setmin(c1, uy);
        setmax(c2, uy);
        for (auto[vx, vy] : harevan) {
            if (vx < 0 || vx >= n) continue;
            if (vy < 0 || vy >= m) continue;

            if (a[vx][vy]) continue;
            dfs(vx, vy, a);
        }
    }
    void bfs(int sx, int sy, VVI& a) {
        queue<PII> q;
        q.push({sx, sy});
        a[sx][sy] = 2;
        while (q.size()) {
            auto[ux, uy] = q.front();
            q.pop();
            setmin(r1, ux);
            setmax(r2, ux);
            setmin(c1, uy);
            setmax(c2, uy);
            for (auto[vx, vy] : harevan(ux, uy)) {
                if (vx < 0 || vx >= n) continue;
                if (vy < 0 || vy >= m) continue;
                if (a[vx][vy]) continue;
                q.push({vx, vy});
                a[vx][vy] = 2;
            }
        }
    }
    ll count_rectangles(VVI a) {
        n = a.size();
        m = a[0].size();
        VVI pref(n+1, VI(m+1));
        replr(i, 1, n) replr(j, 1, m) {
            pref[i][j] = a[i-1][j-1] + pref[i-1][j] + pref[i][j-1] - pref[i-1][j-1];
        }
        int ans = 0;
        rep(i, n) rep(j, m) if (a[i][j] == 0) {
            r1 = +2e9;
            r2 = -2e9;
            c1 = +2e9;
            c2 = -2e9;
            bfs(i, j, a);
            if (r1 == 0 || r2 == n-1 || c1 == 0 || c2 == m-1) continue;
            if (pref[r2+1][c2+1] - pref[r1][c2+1] - pref[r2+1][c1] + pref[r1][c1] == 0) {
                ans++;
            }
        }
        return ans;
    }
}

int gu[3000][3000], gd[3000][3000], gl[3000][3000], gr[3000][3000];
int lu[3000][3000], ru[3000][3000], ul[3000][3000], dl[3000][3000];

bool check(int x1, int x2, int y1, int y2) {
    if ((gu[x2+1][y2] == x1-1 && ul[x2+1][y2] <= y1) || (gd[x1-1][y2] == x2+1 && dl[x1-1][y2] <= y1)); else return false;
    if ((gr[x2][y1-1] == y2+1 && ru[x2][y1-1] <= x1) || (gl[x2][y2+1] == y1-1 && lu[x2][y2+1] <= x1)); else return false;
    return true;
}

ll count_rectangles(VVI a) {
    int n = a.size();
    int m = a[0].size();
    rep(i, n) {
        stack<int> st;
        replr(j, 0, m-1) {
            while (st.size() && a[i][st.top()] < a[i][j]) st.pop();
            gl[i][j] = (st.size() ? st.top() : -1);
            st.push(j);
        }
        st = stack<int>();
        reprl(j, m-1, 0) {
            while (st.size() && a[i][st.top()] < a[i][j]) st.pop();
            gr[i][j] = (st.size() ? st.top() : -1);
            st.push(j);
        }
    }
    rep(j, m) {
        stack<int> st;
        replr(i, 0, n-1) {
            while (st.size() && a[st.top()][j] < a[i][j]) st.pop();
            gu[i][j] = (st.size() ? st.top() : -1);
            st.push(i);
        }
        st = stack<int>();
        reprl(i, n-1, 0) {
            while (st.size() && a[st.top()][j] < a[i][j]) st.pop();
            gd[i][j] = (st.size() ? st.top() : -1);
            st.push(i);
        }
    }
    rep(i, n) {
        rep(j, m) {
            if (~gl[i][j]) {
                if (i && gl[i-1][j] == gl[i][j]) lu[i][j] = lu[i-1][j];
                else if (i && gr[i-1][gl[i][j]] == j) lu[i][j] = ru[i-1][gl[i][j]];
                else lu[i][j] = i;
            }
            if (~gr[i][j]) {
                if (i && gr[i-1][j] == gr[i][j]) ru[i][j] = ru[i-1][j];
                else if (i && gl[i-1][gr[i][j]] == j) ru[i][j] = lu[i-1][gr[i][j]];
                else ru[i][j] = i;
            }
        }
    }
    rep(j, m) {
        rep(i, n) {
            if (~gu[i][j]) {
                if (j && gu[i][j-1] == gu[i][j]) ul[i][j] = ul[i][j-1];
                else if (j && gd[gu[i][j]][j-1] == i) ul[i][j] = dl[gu[i][j]][j-1];
                else ul[i][j] = j;
            }
            if (~gd[i][j]) {
                if (j && gd[i][j-1] == gd[i][j]) dl[i][j] = dl[i][j-1];
                else if (j && gu[gd[i][j]][j-1] == i) dl[i][j] = ul[gu[i][j]][j-1];
                else dl[i][j] = j;
            }
        }
    }

    ll ans = 0;
    replr(x1, 1, n-2) replr(x2, x1, n-2) {
        replr(y1, 1, m-2) replr(y2, y1, m-2) {
            if (check(x1, x2, y1, y2)) {
                ans++;
            }
        }
    }
    return ans;

    auto print = [&](int a[3000][3000]) {
        rep(i, n) {
            rep(j, m) cout << a[i][j] << " ";
            cout << endl;
        }
    };



    return 0;
    if (TEST6::check(a)) return TEST6::count_rectangles(a);
    return TEST1::count_rectangles(a);
}

컴파일 시 표준 에러 (stderr) 메시지

rect.cpp: In function 'void TEST6::dfs(int, int, VVI&)':
rect.cpp:110:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  110 |         for (auto[vx, vy] : harevan) {
      |                  ^
rect.cpp: In function 'void TEST6::bfs(int, int, VVI&)':
rect.cpp:123:17: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  123 |             auto[ux, uy] = q.front();
      |                 ^
rect.cpp:129:22: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  129 |             for (auto[vx, vy] : harevan(ux, uy)) {
      |                      ^
rect.cpp: In function 'll count_rectangles(VVI)':
rect.cpp:240:10: warning: variable 'print' set but not used [-Wunused-but-set-variable]
  240 |     auto print = [&](int a[3000][3000]) {
      |          ^~~~~

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