Submission #1120116

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120116		Yang8on	Mobitel (COCI19_mobitel)	C++17	26 / 130	38 ms	3412 KiB

mobitel

#include <bits/stdc++.h>
#define Y8o "Mobitel"
#define maxn (int) 305
#define ll long long
#define pii pair<int, int>
#define gb(i, j) ((i >> j) & 1)
#define all(x) x.begin(), x.end()
#define _left id * 2, l, mid
#define _right id * 2 + 1, mid + 1, r
#define fi(i, a, b) for(int i = a; i <= b; i ++)
#define fid(i, a, b) for(int i = a; i >= b; i --)

//#define f first
//#define s second

using namespace std;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll GetRandom(ll l, ll r) {
    return uniform_int_distribution<ll> (l, r) (rng);
}
void iof() {
    ios_base::sync_with_stdio(0);
    cin.tie(NULL), cout.tie(NULL);
    if(fopen(Y8o".inp", "r"))
    {
        freopen(Y8o".inp", "r", stdin);
//        freopen(Y8o".out", "w", stdout);
    }
}
void ctime() {
    cerr << "\n" << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
}

const int mod = 1e9 + 7;
void Add(int &x, int y) {
    x += y;
    if(x >= mod) x -= mod;
    if(x < 0) x += mod;
}

int m, n, k;
int a[maxn][maxn], vir[2005];
int dp[2][maxn][2005];
vector<int> val;

int need(int x, int y) {
    return (x - 1) / y + 1;
}

void solve() {
    cin >> m >> n >> k;
    fi(i, 1, m) fi(j, 1, n) cin >> a[i][j];

    fi(x, 1, k) {
        int tmp = need(k, x);
        if(val.empty() || val.back() != tmp) {
            vir[tmp] = val.size();
            val.push_back(tmp);
        }
    }

    dp[0][1][vir[k]] = 1;
    fi(i, 1, m) {
        fi(j, 1, n) {
            for(int pre : val) {
                int tmp = vir[need(pre, a[i][j])];
                Add(dp[1][j][tmp], dp[0][j][vir[pre]]);
                Add(dp[1][j][tmp], dp[1][j - 1][vir[pre]]);
            }
        }

        fi(j, 1, n) {
            for(int pre : val) {
                dp[0][j][vir[pre]] = dp[1][j][vir[pre]], dp[1][j][vir[pre]] = 0;
            }
        }
    }
    cout << dp[0][n][vir[1]];



//    dp[0][1][vir[k]] = 1;
//    fi(i, 1, m) {
//        fi(j, 1, n) {
//            for(int pre : val) {
//                int tmp = vir[need(pre, a[i][j])];
//                Add(dp[i][j][tmp], dp[i - 1][j][vir[pre]]);
//                Add(dp[i][j][tmp], dp[i][j - 1][vir[pre]]);
//            }
//        }
//    }
//    cout << dp[m][n][vir[1]];
}


int main() {
    iof();

    int nTest = 1;
//    cin >> nTest;

    while(nTest --) {
        solve();
    }

    ctime();
    return 0;
}

Compilation message (stderr)

mobitel.cpp: In function 'void iof()':
mobitel.cpp:27:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |         freopen(Y8o".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 26 / 130