11-Largestproductinagrid.cpp

#include              <bits/stdc++.h>
#define ll            long long int
#define w(t)          int t; cin>>t; while(t--)
#define F             first
#define S             second
#define pb            push_back
#define mp            make_pair
#define pii           pair<int,int>
#define mii           map<int,int>
#define sp(x,y)       fixed<<setprecision(y)<<x
using namespace std;
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int a[20][20]={ {8, 2, 22, 97, 38, 15, 0, 40, 0, 75, 04, 05, 07, 78, 52, 12, 50, 77, 91, 8},
                    {49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 4, 56, 62, 0},
                    {81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 3, 49, 13, 36, 65},
                    {52, 70, 95, 23, 4, 60, 11, 42, 69, 24, 68, 56, 1, 32, 56, 71, 37, 2, 36, 91},
                    {22, 31, 16, 71, 51, 67, 63, 89, 41, 92, 36, 54, 22, 40, 40, 28, 66, 33, 13, 80},
                    {24, 47, 32, 60, 99, 3, 45, 2, 44, 75, 33, 53, 78, 36, 84, 20, 35, 17, 12, 50},
                    {32, 98, 81, 28, 64, 23, 67, 10, 26, 38, 40, 67, 59, 54, 70, 66, 18, 38, 64, 70},
                    {67, 26, 20, 68, 2, 62, 12, 20, 95, 63, 94, 39, 63, 8, 40, 91, 66, 49, 94, 21},
                    {24, 55, 58, 5, 66, 73, 99, 26, 97, 17, 78, 78, 96, 83, 14, 88, 34, 89, 63, 72},
                    {21, 36, 23, 9, 75, 0, 76, 44, 20, 45, 35, 14, 0, 61, 33, 97, 34, 31, 33, 95},
                    {78, 17, 53, 28, 22, 75, 31, 67, 15, 94, 3, 80, 4, 62, 16, 14, 9, 53, 56, 92},
                    {16, 39, 5, 42, 96, 35, 31, 47, 55, 58, 88, 24, 0, 17, 54, 24, 36, 29, 85, 57},
                    {86, 56, 0, 48, 35, 71, 89, 7, 5, 44, 44, 37, 44, 60, 21, 58, 51, 54, 17, 58},
                    {19, 80, 81, 68, 5, 94, 47, 69, 28, 73, 92, 13, 86, 52, 17, 77, 4, 89, 55, 40},
                    {4, 52, 8, 83, 97, 35, 99, 16, 7, 97, 57, 32, 16, 26, 26, 79, 33, 27, 98, 66},
                    {88, 36, 68, 87, 57, 62, 20, 72, 3, 46, 33, 67, 46, 55, 12, 32, 63, 93, 53, 69},
                    {4, 42, 16, 73, 38, 25, 39, 11, 24, 94, 72, 18, 8, 46, 29, 32, 40, 62, 76, 36},
                    {20, 69, 36, 41, 72, 30, 23, 88, 34, 62, 99, 69, 82, 67, 59, 85, 74, 4, 36, 16},
                    {20, 73, 35, 29, 78, 31, 90, 1, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 5, 54},
                    {1, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 1, 89, 19, 67, 48} };
    ll max=0,p;
    for(int i=0;i<20;i++){
        for(int j=0;j<17;j++){
            p=a[i][j]*a[i][j+1]*a[i][j+2]*a[i][j+3];
            if(max<p)max=p;
        }
    }
    for(int i=0;i<17;i++){
        for(int j=0;j<20;j++){
            p=a[i][j]*a[i+1][j]*a[i+2][j]*a[i+3][j];
            if(max<p)max=p;
        }
    }
    for(int i=0;i<17;i++){
        for(int j=0;j<17;j++){
            p=a[i][j]*a[i+1][j+1]*a[i+2][j+2]*a[i+3][j+3];
            if(max<p)max=p;
        }
    }
    for(int i=0;i<17;i++){
        for(int j=0;j<17;j++){
            p=a[i][j]*a[i+1][j+1]*a[i+2][j+2]*a[i+3][j+3];
            if(max<p)max=p;
        }
    }
    for(int i=0;i<17;i++){
        for(int j=3;j<20;j++){
            p=a[i][j]*a[i+1][j-1]*a[i+2][j-2]*a[i+3][j-3];
            if(max<p)max=p;
        }
    }
    cout<<max;
    return 0;
}