Submission #578850

#	Time	Username	Problem	Language	Result	Execution time	Memory
578850		Theo830	Rectangles (IOI19_rect)	C++17	0 / 100	32 ms	15856 KiB

rect

#pragma GCC optimize("Ofast")
#pragma GCC optimize ("O3")
#pragma GCC optimization ("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,fma")
#include <bits/stdc++.h>
using namespace std;
typedef int ll;
const ll INF = 1e9+7;
ll MOD = 998244353;
typedef pair<ll,ll> ii;
#define iii pair<ll,ii>
#define f(i,a,b) for(ll i = a;i < b;i++)
#define pb push_back
#define vll vector<ll>
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
///I hope I will get uprating and don't make mistakes
///I will never stop programming
///sqrt(-1) Love C++
///Please don't hack me
///@TheofanisOrfanou Theo830
///Think different approaches (bs,dp,greedy,graphs,shortest paths,mst)
///Stay Calm
///Look for special cases
///Beware of overflow and array bounds
///Think the problem backwards
///Training
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
uniform_int_distribution<ll> distr;
ll rnd(ll a, ll b){return distr(rng)%(b-a+1)+a;}
#include "rect.h"
/*
long long count_rectangles(std::vector<std::vector<int> > a);
int main() {
    int n, m;
    cin>>n>>m;
    vector<vector<int>> a(n, vector<int>(m));
    for (int i = 0; i < n; i++)	{
        for (int j = 0; j < m; j++) {
            cin>>a[i][j];
        }
    }
    long long result = count_rectangles(a);

    printf("%lld\n", result);
    return 0;
}
*/
bool ok1[700][700][700];
bool ok2[700][700][700];
long long count_rectangles(vector<vector<int> > a){
    ll ans = 0;
    ll n = a.size();
    ll m = a[0].size();
    f(i,1,n-1){
        f(j,1,m-1){
            ll Maxi = a[i][j];
            ok1[i][j][j] = min(a[i][j-1],a[i][j+1]) > Maxi;
            f(k,j+1,m-1){
                Maxi = max(Maxi,a[i][k]);
                ok1[i][j][k] = min(a[i][j-1],a[i][k+1]) > Maxi;
            }
        }
    }
    f(i,1,m-1){
        f(j,1,n-1){
            ll maxi = a[j][i];
            ok2[i][j][j] = min(a[j-1][i],a[j+1][i]) > maxi;
            f(k,j+1,n-1){
                maxi = max(maxi,a[k][i]);
                ok2[i][j][k] = min(a[j-1][i],a[k+1][i]) > maxi;
            }
        }
    }
    f(i,1,n-1){
        bool OK[m][m];
        f(j,1,m-1){
            f(jj,j,m-1){
                OK[j][jj] = 1;
            }
        }
        f(ii,i,n-1){
            f(j,1,m-1){
                bool OK2 = 1;
                f(jj,j,m-1){
                    OK[j][jj] &= ok1[j][jj][ii];
                    OK2 &= ok2[jj][i][ii];
                    if(!OK2){
                        break;
                    }
                    ans += OK[j][jj];
                }
            }
        }
    }
    return ans;
}
/*
6 5
4 8 7 5 6
7 4 10 3 5
9 7 20 14 2
9 14 7 3 6
5 7 5 2 7
4 5 13 5 6
*/

Compilation message (stderr)

rect.cpp:3: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    3 | #pragma GCC optimization ("unroll-loops")
      |

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