Submission #225173

#	Time	Username	Problem	Language	Result	Execution time	Memory
225173		Vimmer	Mobitel (COCI19_mobitel)	C++14	0 / 130	123 ms	65540 KiB

mobitel

#include <bits/stdc++.h>

//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")

#define F first
#define S second
#define sz(x) int(x.size())
#define pb push_back
#define N 100005
#define MOD ll(1e9 + 7)

using namespace std;

typedef long long ll;

typedef long double ld;



ll a[105][105], dp[105][105], f[105][105][105][105], n, m, s, ans;

int mk[105][105];

vector <pair <ll, ll> >  vr;


void rec(int x, int y, ll sm, ll kol);

void dfs(int x, int y, int xr, int yr, int id)
{
    if (mk[x][y] == id) return;

    mk[x][y] = id;

    if (x + 1 != n)
    {
        if (a[x + 1][y] == 1) dfs(x + 1, y, xr, yr, id);
          else rec(x + 1, y, vr[id - 1].F * a[x + 1][y], (vr[id - 1].S * f[x][y][xr][yr]) % MOD);
    }

    if (y + 1 != m)
    {
        if (a[x][y + 1] == 1) dfs(x, y + 1, xr, yr, id);
          else rec(x, y + 1, vr[id - 1].F * a[x][y + 1], (vr[id - 1].S * f[x][y][xr][yr]) % MOD);
    }
}

void rec(int x, int y, ll sm, ll kol)
{
    if (sm >= s) {ans = (ans + (kol * dp[x][y]) % MOD) % MOD; return;}

    if (a[x][y] == 1) {vr.pb({sm, kol}); dfs(x, y, x, y, sz(vr)); return;}

    if (x + 1 != n) rec(x + 1, y, sm * a[x + 1][y], kol);

    if (y + 1 != m) rec(x, y + 1, sm * a[x][y + 1], kol);
}


int main()
{

    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    cin >> n >> m >> s;

    for (int i = 0; i < n; i++)
        for (int j = 0; j < m; j++) cin >> a[i][j];

    dp[n - 1][m - 1] = 1;

    for (int i = n - 1; i >= 0; i--)
        for (int j = m - 1; j >= 0; j--)
        {
            if (i + 1 != n) dp[i][j] = (dp[i][j] + dp[i + 1][j]) % MOD;

            if (j + 1 != m) dp[i][j] = (dp[i][j] + dp[i][j + 1]) % MOD;
        }

    for (int xr = 0; xr < n; xr++)
        for (int yr = 0; yr < m; yr++)
        {
            if (a[xr][yr] != 1) continue;

            for (int x = 0; x < n; x++)
                for (int y = 0; y < m; y++) f[x][y][xr][yr] = 0;

            f[xr][yr][xr][yr] = 1;

            for (int x = 0; x < n; x++)
                for (int y = 0; y < m; y++)
                {
                    if (x != 0 && a[x - 1][y] == 1) f[x][y][xr][yr] = (f[x][y][xr][yr] + f[x - 1][y][xr][yr]) % MOD;

                    if (y != 0 && a[x][y - 1] == 1) f[x][y][xr][yr] = (f[x][y][xr][yr] + f[x][y - 1][xr][yr]) % MOD;
                }
        }
    rec(0, 0, a[0][0], 1);

    cout << ans << endl;
}

• Subtask 1: 0 / 130