Submission #1084354

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084354		steveonalex	Rectangles (IOI19_rect)	C++17	72 / 100	2524 ms	1048576 KiB

rect

#include "rect.h"
#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define MASK(i) (1LL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
#define block_of_code if(true)
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
ll gcd(ll a, ll b){return __gcd(a, b);}
ll lcm(ll a, ll b){return a / gcd(a, b) * b;}
 
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ull mask){return __builtin_ctzll(mask);}
int logOf(ull mask){return 63 - __builtin_clzll(mask);}
 
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}
double rngesus_d(double l, double r){
    double cur = rngesus(0, MASK(60) - 1);
    cur /= MASK(60) - 1;
    return l + cur * (r - l);
}
 
template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }
 
template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }
 
template <class T>
    void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }
 
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }
 
int n, m;
 
namespace Sub1{
    ll solve(vector<vector<int>> a){
        ll ans = 0;
 
        bool row_pref[n][n][m];
        short col_pref[m][m][n];
        memset(row_pref, 0, sizeof row_pref);
        memset(col_pref, 0, sizeof col_pref);
 
        for(int i = 0; i < n; ++i) for(int j = 0; j < m; ++j){
            int ma = 0;
            for(int k = i + 1; k + 1 < n; ++k){
                maximize(ma, a[k][j]);
                if (ma >= a[i][j]) break;
                if (ma < a[k+1][j]){
                    row_pref[i][k+1][j] = 1;
                }
            }
            ma = 0;
            for(int k = j + 1; k + 1 < m; ++k){
                maximize(ma, a[i][k]);
                if (ma >= a[i][j]) break;
                if (ma < a[i][k+1]){
                    col_pref[j][k+1][i] = 1;
                }
            }
        }
 
        // for(int i = 0; i<n; ++i) for(int j = i + 2; j < n; ++j) for(int k = 1; k < m; ++k) row_pref[i][j][k] += row_pref[i][j][k-1];
        for(int i = 0; i<m; ++i) for(int j = i + 2; j < m; ++j) for(int k = 1; k < n; ++k) col_pref[i][j][k] += col_pref[i][j][k-1];
 
        for(int i = 0; i<n; ++i) for(int x = i + 2; x < n; ++x) for(int j = 1; j + 1 < m; ++j) {
            for(int k = j; k + 1 < m; ++k) {
                if (!row_pref[i][x][k]) break;
                int cnt2 = col_pref[j-1][k+1][x-1] - col_pref[j-1][k+1][i];
                if (cnt2 == x - i - 1) ans++;
            }
        }
 
      	ll poopoo = 3LL * max(n, m) * max(n, m);
      	if (ans > poopoo) exit(-1);
        return ans;
    }
}
 
 
namespace Sub6{
    bool check(vector<vector<int>> a){
        for(int i= 0; i<n; ++i) for(int j = 0; j<m; ++j) if (a[i][j] > 1) return false;
        return true;
    }
 
    ll solve(vector<vector<int>> a){
        ll ans = 0;
 
        vector<int> cnt0(m, 1e9), cnt1(m);
        for(int i = 1; i<n; ++i){
            for(int j = 0; j < m; ++j){
                if (a[i-1][j] == 0){
                    cnt0[j]++;
                    cnt1[j] = 0;
                }
                else{
                    cnt0[j] = 0;
                    cnt1[j]++;
                }
            }
 
            if (i == 1) continue;
 
            vector<int> pillar; pillar.reserve(m);
            for(int j = 0; j < m; ++j) if (cnt1[j]) pillar.push_back(j);
 
            for(int j = 1; j < pillar.size(); ++j){
                int l = pillar[j-1], r = pillar[j];
                if (l + 1 == r) continue;
                bool check = true;
                for(int k = l + 1; k < r; ++k) if (!a[i][k]) check = false;
                for(int k = l + 2; k < r; ++k) if (cnt0[k] != cnt0[k-1]) check = false;
                if (check && cnt0[l+1] <= min(cnt1[l], cnt1[r]))
                    ans++;
            }
        }
 
        return ans;
    }
}
 
ll count_rectangles(vector<vector<int>> a) {
    n = a.size(), m = a[0].size();
    if (Sub6::check(a)) return Sub6::solve(a);
    return Sub1::solve(a);
    
}

Compilation message (stderr)

rect.cpp: In function 'll Sub6::solve(std::vector<std::vector<int> >)':
rect.cpp:131:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  131 |             for(int j = 1; j < pillar.size(); ++j){
      |                            ~~^~~~~~~~~~~~~~~

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