Submission #1215932

#	Time	Username	Problem	Language	Result	Execution time	Memory
1215932		M_SH_O	Bomb (IZhO17_bomb)	C++20	17 / 100	219 ms	59212 KiB

bomb

#include <bits/stdc++.h>
//#include "grader.h"
/*#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>*/

#define ll long long
#define ll1 long long
#define ull unsigned long long
#define dou long double
#define str string
#define vll vector<ll>
#define vi vector<int>
#define pll pair<ll, ll>
#define vpll vector<pll>
#define vbool vector<bool>
#define vstr vector<str>
#define vvll vector<vll>
#define pb push_back
#define pf push_front
#define endl "\n"
#define fr first
#define se second
// #define sortcmp(a) sort(a.begin(), a.end(), cmp)
#define sort(a) sort(a.begin(), a.end())
#define all(a) a.begin(), a.end()
#define reverse(a) reverse(a.begin(), a.end())
#define speed ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define INF 1000000000000000000
#define ordered_set tree<pll, null_type, less<pll>, rb_tree_tag, tree_order_statistics_node_update>

using namespace std;
//using namespace __gnu_pbds;

mt19937 rng(1488);
ll randll(ll l, ll r){
    return uniform_int_distribution<ll>(l, r)(rng);
}

/*vector<map<ll, vll>> s;
vll p;

ll find(ll v) {
    if (p[v] == v) return v;
    return p[v] = find(p[v]);
}

void unite(ll a, ll b) {
    a = find(a);
    b = find(b);

    if (a == b) return;
    if (s[a].size() < s[b].size()) {
        p[a] = b;
        for (auto i : s[a]) {
            for (int j : i.se) {
                s[b][i.fr].pb(j);
            }
        }
        s[a].clear();
    }
    else {
        p[b] = a;
        for (auto i : s[b]) {
            for (int j : i.se) {
                s[a][i.fr].pb(j);
            }
        }
        s[b].clear();
    }
}

vll tree1, d;

void push(ll v, ll tl, ll tr) {
    if (tl == tr) return;
    tree1[v*2] += d[v];
    tree1[v*2+1] += d[v];
    d[v*2] += d[v];
    d[v*2+1] += d[v];
    d[v] = 0;
    tree1[v] = tree1[v*2]+tree1[v*2+1];
}

void bt(ll v, ll tl, ll tr, vll& a) {
    if (tl == tr) {
        tree1[v] = a[tl];
        return;
    }

    ll tm = (tl+tr)/2;
    bt(v*2, tl, tm, a);
    bt(v*2, tm+1, tr, a);

    tree1[v] = tree1[v*2]+tree1[v*2+1];
}

ll get(ll l, ll r, ll v, ll tl, ll tr) {
    if (l <= tl && tr <= r) return tree1[v];
    if (tl > r || tr < l) return 0;

    ll tm = (tl+tr)/2;
    push(v, tl, tr);
    return get(l, r, v*2, tl, tm)+get(l, r, v*2+1, tm+1, tr);
}

void update(ll l, ll r, ll val, ll v, ll tl, ll tr) {
    if (l <= tl && tr <= r) {
        tree1[v] += val;
        d[v] += val;
        push(v, tl, tr);
        return;
    }
    if (tl > r || tr < l) return;

    ll tm = (tl+tr)/2;
    push(v, tl, tr);

    update(l, r, val, v*2, tl, tm);
    update(l, r, val, v*2+1, tm+1, tr);

    tree1[v] = tree1[v*2]+tree1[v*2+1];
}*/

ll sum(ll x, ll y, ll x1, ll y1, vvll& p) {
    x ++, y ++, x1 ++, y1 ++;
    return p[x1][y1]-p[x1][y-1]-p[x-1][y1]+p[x-1][y-1];
}

int main() {
    ll n, m;
    cin >> n >> m;
    vstr s(n);
    vvll p(n+7, vll(m+7, 0));

    for (int i = 0; i < n; i ++) {
        cin >> s[i];
    }

    for (int i = 1; i <= n; i ++) {
        for (int j = 1; j <= m; j ++) {
            p[i][j] = p[i-1][j]+p[i][j-1]-p[i-1][j-1];
            if (s[i-1][j-1] == '1') p[i][j] ++;
        }
    }
    ll minly = INF, minlx = INF;

    for (int i = 0; i < n; i ++) {
        ll k = 0;
        for (int j = 0; j < m; j ++) {
            if (s[i][j] == '1') k ++;
            else if (k > 0) {
                ll l = i, r = n;
                while (r-l > 1) {
                    ll x = (l+r)/2;
                    if (sum(i, j-k, x, j-1, p) == (x-i+1)*(j-1-(j-k)+1)) l = x;
                    else r = x;
                }
                ll l1 = l;
                l = -1, r = i;
                while (r-l > 1) {
                    ll x = (l+r)/2;
                    if (sum(i, j-k, x, j-1, p) == (x-i+1)*(j-1-(j-k)+1)) r = x;
                    else l = x;
                }
                if (k < minly) {
                    minly = k;
                    minlx = l1-l;
                }
                if (k == minly) {
                    minlx = min(minlx, l1-l);
                }
                k = 0;
            }
        }
    }

    //cout << minlx << ' ' << minly << endl;

    ll minly1 = INF, minlx1 = INF;

    for (int j = 0; j < m; j ++) {
        ll k = 0;
        for (int i = 0; i < n; i ++) {
            if (s[i][j] == '1') k ++;
            else if (k > 0) {
                ll l = j, r = m;
                while (r-l > 1) {
                    ll x = (l+r)/2;
                    if (sum(i-k, j, i-1, x, p) == (x-j+1)*(i-(i-k))) l = x;
                    else r = x;
                }
                ll l1 = l;
                l = -1, r = j;
                while (r-l > 1) {
                    ll x = (l+r)/2;
                    if (sum(i-k, j, i-1, x, p) == (x-j+1)*(i-(i-k))) r = x;
                    else l = x;
                }
                if (k < minlx1) {
                    minlx1 = k;
                    minly1 = l1-l;
                }
                if (k == minlx1) {
                    minly1 = min(minly1, l1-l);
                }
                k = 0;
            }
        }
    }

    minly = min(minly, minly1);
    minlx = min(minlx, minlx1);
   // cout << minlx1 << ' ' << minly1 << endl;

    cout << minly*minlx << endl;
}

• Subtask 1: 17 / 100