Submission #377599

#	Time	Username	Problem	Language	Result	Execution time	Memory
377599		nguyen31hoang08minh2003	Selotejp (COCI20_selotejp)	C++14	70 / 110	1095 ms	8940 KiB

Main

#include <bits/stdc++.h>
#define fore(i, a, b) for (ll i = (a), _b = (b); i < (_b); i++)
#define fort(i, a, b) for (ll i = (a), _b = (b); i <= (_b); i++)
#define ford(i, a, b) for (ll i = (a), _b = (b); i >= (_b); i--)
#define fi first
#define se second
#define sz(x) ((ll)(x).size())
#define getbit(x, i) ((x) & (1LL << (i)))
#define on(x, i) ((x) | (1LL << (i)))
#define off(x, i) ((x) ^ (1LL << (i)))
#define lowbit(x) ((x) & (-(x)))
#define pb push_back
#define pf push_front
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef vector<ll> vi;
typedef pair<ll, ll> ii;
typedef vector<vi> vvi;
typedef vector<ii> vii;
typedef vector<vii> vvii;

bool mini(ll &a, const ll b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}

bool maxi(ll &a, const ll b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

const ll maxM = 1005;
const ll inf = 1e18;
const ll maxN = 10;

ll m, n, full, choco[maxM];
ll cntbit[1LL << maxN], row[1LL << maxN], dp[maxM][1LL << maxN];
vi submsk[1LL << maxN];
bool vis[maxM][1LL << maxN];
char c[maxM][maxN];

ll CountBit(ll x) {
    ll res = 0;
    for (; x > 0; x -= lowbit(x))
        res++;
    return res;
}

ll costRow(ll msk) {
    ll res = 0;
    vi row;
    row.pb(0);
    fore(i, 0 , n)
        row.pb((bool)getbit(msk, i));
    fore(i, 1, sz(row))
        if (row[i] == 1 && !row[i - 1])
            res++;
    return res;
}

ll DP(ll i, ll prv) {
    if (i > m)
        return 0;
    if (!vis[i][prv]) {
        vis[i][prv] = true;
        dp[i][prv] = inf;
//        fort(cols, 0, full)
//            if ((choco[i] & cols) == cols) {
//                mini(dp[i][prv], cntbit[cols] - cntbit[cols & prv] + row[choco[i] ^ cols] + DP(i + 1, cols & choco[i + 1]));
//            }
        ll cols;
        for (vi::iterator j = submsk[choco[i]].begin(); j != submsk[choco[i]].end(); j++) {
            cols = *j;
            mini(dp[i][prv], cntbit[cols] - cntbit[cols & prv] + row[choco[i] ^ cols] + DP(i + 1, cols));
        }
    }
    return dp[i][prv];
}

void input() {
    cin >> m >> n;
    fort(i, 1, m) {
        cin >> c[i];
        fore(j, 0, n)
            if (c[i][j] == '#')
                choco[i] |= (1LL << j);
    }
}

void solve() {
    //preprocess
    full = (1LL << n) - 1;
    fort(i, 0, full) {
        row[i] = costRow(i);
        cntbit[i] = CountBit(i);
        fort(j, 0, full)
            if ((i & j) == j)
                submsk[i].pb(j);
    }
    //main solve
    cout << DP(1, 0) << '\n';
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    input();
    solve();
    return 0;
}

• Subtask 1: 35 / 35
• Subtask 2: 35 / 35
• Subtask 3: 0 / 40