Submission #1219983

#	Time	Username	Problem	Language	Result	Execution time	Memory
1219983		M_SH_O	Red-blue table (IZhO19_stones)	C++20	58 / 100	17 ms	1604 KiB

stones

#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);
}

/*vvll s1;
vll p;

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

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

    if (a == b) return {};
    if (s1[a].size() < s1[b].size()) {
        p[a] = b;
        for (auto i : s1[a]) {
            s1[b].pb(i);

        }
        return s1[a];
    }
    else {
        p[b] = a;
        for (auto i : s1[b]) {
            s1[a].pb(i);

        }
        return s1[b];
    }
}

vll tree1, d, tree;

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] = tree[v] = a[tl];
        return;
    }

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

    tree1[v] = min(tree1[v*2], tree1[v*2+1]);
    tree[v] = max(tree[v*2], tree[v*2+1]);
}

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

    ll tm = (tl+tr)/2;
    //push(v, tl, tr);
    ll p = get(l, r, v*2, tl, tm), p1 = get(l, r, v*2+1, tm+1, tr);
    return max(p,p1);
}


void update(ll idx, ll val, ll v, ll tl, ll tr) {
    if (tl == tr) {
        tree[v] = val;
        /*d[v] += val;
        push(v, tl, tr);
        return;
    }

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

    if (idx <= tm)update(idx, val, v*2, tl, tm);
    else update(idx, val, v*2+1, tm+1, tr);

    tree[v] = max(tree[v*2], tree[v*2+1]);
}*/

int main() {
    srand(time(0));
    speed;

    ll t;
    cin >> t;
    while (t --) {
        ll n, m;
        cin >> n >> m;
        ll res = max(n, m)+min(n, m)-min(n,m)/2-1;
        if (n <= m) {
            vstr s(n, "");
            for (int i = 0; i < n; i ++) {
                for (int j = 0; j < m; j ++) {
                    s[i] += "-";
                }
            }
            vll k(n, 0);
            ll l = 0;
            for (int i = n/2+1; i < n; i ++) {
                k[i] = m/2+1;
                k[l] += m-(m/2+1);
                if (k[l] >= m/2+1) {
                    k[l+1] = k[l]-m/2-1;
                    k[l] = m/2+1;
                    l ++;
                    res ++;
                }
            }
            l = 0;
            vll v(m, 0);
            for (int i = n/2+1; i < n; i ++) {
                for (int j = m/2+1; j < m; j ++) {
                    s[i][j] = '+';
                }
                s[i][l ++] = '+';
                l %= m/2+1;
                if (m % 2 == 0) {
                    s[i][l ++] = '+';
                }
                l %= m/2+1;
                for (int j = 0; j < m; j ++) {
                    if (s[i][j] == '-') {
                        s[v[j] ++][j] = '+';
                    }
                }
            }

            cout << res << endl;
            for (int i = 0; i < n; i ++) {
                cout << s[i] << endl;
            }
        }
        else {
            vstr s(n, "");
            for (int i = 0; i < m/2+1; i ++) {
                for (int j = 0; j < n; j ++) {
                    s[j] += "+";
                }
                //cout << endl;
            }
            for (int i = m/2+1; i < m; i ++) {
                for (int j = 0; j < n; j ++) {
                    s[j] += "-";
                }
            }
            ll k = m/2;
            for (int i = m/2+1; i < m-1; i += 2) {
                for (int j = 0; j < n/2-(n % 2 == 0); j ++) {
                    swap(s[j][i], s[j][k]);
                }
                if (n % 2 == 0) swap(s[n/2-1][i+1], s[n/2-1][k]);
                swap(s[n/2][i+1], s[n/2][k]);
                k --;
                res ++;
            }
            cout << res << endl;
            for (int i =0 ; i < n; i ++) {
                cout << s[i] << endl;
            }
        }
    }
}

• Subtask 1: 17 / 17
• Subtask 2: 10 / 10
• Subtask 3: 16 / 16
• Subtask 4: 0 / 11
• Subtask 5: 15 / 15
• Subtask 6: 0 / 31