Submission #219827

#	Time	Username	Problem	Language	Result	Execution time	Memory
219827		VEGAnn	Rectangles (IOI19_rect)	C++14	59 / 100	5104 ms	372092 KiB

rect

#include <bits/stdc++.h>
#include "rect.h"
#define all(x) x.begin(),x.end()
#define PB push_back
#define sz(x) ((int)x.size())
#define pii pair<int,int>
#define MP make_pair
#define ft first
#define sd second
using namespace std;
typedef long long ll;
const int N = 2510;
const int oo = 2e9;
const int PW = 13;
vector<pii> qr;
stack<int> stk;
int n, m, kol = 0, mx, my, Mx, My, lf[N][N], rt[N][N], up[N][N], down[N][N], spar[2][N][N][PW], po[N];
int fen[N];
ll ans = 0, big = 0;

int get(int tp, int i, int l, int r){
    int len = r - l + 1;
    int pw = po[len];

    if (tp == 1)
        return min(spar[tp][i][l][pw], spar[tp][i][r - (1 << pw) + 1][pw]);
    else return max(spar[tp][i][l][pw], spar[tp][i][r - (1 << pw) + 1][pw]);
}

int upd(int x, int vl){
    for (; x < n; x = (x | (x + 1)))
        fen[x] += vl;
}

int sum(int x){
    int res = 0;
    for (; x >= 0; x = (x & (x + 1)) - 1)
        res += fen[x];
    return res;
}

long long count_rectangles(std::vector<std::vector<int> > a) {
    n = sz(a);
    m = sz(a[0]);

    if (n < 3 || m < 3) return 0;

    for (int i = 0; i < n; i++){
        while (sz(stk)) stk.pop();
        stk.push(-1);

        for (int j = 0; j < m; j++){
            while (sz(stk) > 1 && a[i][stk.top()] < a[i][j])
                stk.pop();

            lf[i][j] = stk.top();
            stk.push(j);
        }

        while (sz(stk)) stk.pop();
        stk.push(m);

        for (int j = m - 1; j >= 0; j--){
            while (sz(stk) > 1 && a[i][stk.top()] < a[i][j])
                stk.pop();

            rt[i][j] = stk.top();
            stk.push(j);
        }
    }

    for (int j = 0; j < m; j++){
        while (sz(stk)) stk.pop();
        stk.push(-1);

        for (int i = 0; i < n; i++){
            while (sz(stk) > 1 && a[stk.top()][j] < a[i][j])
                stk.pop();

            up[i][j] = stk.top();
            stk.push(i);
        }

        while (sz(stk)) stk.pop();
        stk.push(n);

        for (int i = n - 1; i >= 0; i--){
            while (sz(stk) > 1 && a[stk.top()][j] < a[i][j])
                stk.pop();

            down[i][j] = stk.top();
            stk.push(i);
        }
    }

    po[0] = -1;
    for (int i = 1; i <= max(n, m); i++)
        po[i] = po[i >> 1] + 1;

    for (int i = 1; i < n - 1; i++){
        for (int j = 0; j < m; j++){
            spar[0][i][j][0] = up[i + 1][j];
            spar[1][i][j][0] = down[i - 1][j];
        }

        for (int pw = 1; pw < PW; pw++)
        for (int j = 0; j + (1 << pw) - 1 < m; j++){
            spar[0][i][j][pw] = max(spar[0][i][j][pw - 1], spar[0][i][j + (1 << (pw - 1))][pw - 1]);
            spar[1][i][j][pw] = min(spar[1][i][j][pw - 1], spar[1][i][j + (1 << (pw - 1))][pw - 1]);
        }
    }

    for (int c1 = 1; c1 < m - 1; c1++)
    for (int c2 = c1; c2 < m - 1; c2++){

        for (int r1 = 1; r1 < n - 1; ){
            int i = r1;

            while (i < n - 1 && (rt[i][c1 - 1] > c2 && lf[i][c2 + 1] < c1))
                i++;

            qr.clear();

            for (int r2 = r1; r2 < i; r2++){
                qr.PB({get(0, r2, c1, c2), r2});

                int bd = min(n - 1, get(1, r2, c1, c2));

                qr.PB({r2, -bd});
            }

            sort(all(qr));

            for (pii cr : qr)
                if (cr.sd > 0)
                    upd(cr.sd, 1);
                else ans += sum(-cr.sd - 1) - sum(cr.ft - 1);

            for (pii cr : qr)
                if (cr.sd > 0)
                    upd(cr.sd, -1);

            r1 = i + 1;
        }
    }

	return ans;
}

Compilation message (stderr)

rect.cpp: In function 'int upd(int, int)':
rect.cpp:33:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

• Subtask 1: 8 / 8
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 22 / 22
• Subtask 5: 10 / 10
• Subtask 6: 0 / 13
• Subtask 7: 0 / 28