Submission #663385

#	Time	Username	Problem	Language	Result	Execution time	Memory
663385		esomer	Raisins (IOI09_raisins)	C++17	25 / 100	5098 ms	320 KiB

raisins

#include<bits/stdc++.h>

using namespace std;

#define ll long long
#define endl "\n"

const int MOD = 1e9 + 7;

ll solve(vector<vector<int>>& table){
    int n = table.size();
    int m = table[0].size();
    ll ans = 0;
    function<void(int, int, int, int)> DFS = [&](int lx, int rx, int ly, int ry){
        cout << "Lx "<< lx << " rx "<< rx << " ly "<< ly << " ry "<< ry << " ans " << ans << endl;
        if(rx - lx == 0 && ry - ly == 0) return;
        int mn = 1e9;
        pair<int, int> cut;
        for(int i = ly; i <= ry; i++){
            for(int j = lx; j <= rx; j++) ans += table[i][j];
        }
        for(int i = ly; i < ry; i++){
            int up = 0;
            int down = 0;
            for(int j = ly; j <= i; j++){
                for(int q = lx; q <= rx; q++) up += table[j][q];
            }
            for(int j = i + 1; j <= ry; j++){
                for(int q = lx; q <= rx; q++) down += table[j][q];
            }
            if(abs(up - down) < mn){
                mn = abs(up - down);
                cut = {i, 0};
            }
        }
        for(int i = lx; i < rx; i++){
            int left = 0;
            int right = 0;
            for(int j = lx; j <= i; j++){
                for(int q = ly; q <= ry; q++) left += table[q][j];
            }
            for(int j = i + 1; j <= rx; j++){
                for(int q = ly; q <= ry; q++) right += table[q][j];
            }
            if(abs(left - right) < mn){
                mn = abs(left - right);
                cut = {i, 1};
            }
        }
        cout << "Cut "<< cut.first << " " << cut.second << " mn "<< mn << endl;
        if(cut.second == 0) {DFS(lx, rx, ly, cut.first); DFS(lx, rx, cut.first + 1, ry);}
        else {DFS(lx, cut.first, ly, ry); DFS(cut.first + 1, rx, ly, ry);}
    };
    DFS(0, m - 1, 0, n - 1);
    return ans;
}

mt19937 gen(time(0));

ll solve2(vector<vector<int>>& table){
    int n = table.size();
    int m = table[0].size();
    function<ll(int, int, int, int)> DFS = [&](int lx, int rx, int ly, int ry){
        if(rx - lx == 0 && ry - ly == 0) return 0;
        ll ans = 1e18;
        for(int i = ly; i < ry; i++){
            ans = min(ans, DFS(lx, rx, ly, i) + DFS(lx, rx, i + 1, ry));
        }
        for(int i = lx; i < rx; i++){
            ans = min(ans, DFS(lx, i, ly, ry) + DFS(i + 1, rx, ly, ry));
        }
        for(int i = ly; i <= ry; i++){
            for(int j = lx; j <= rx; j++) ans += table[i][j];
        }
        return (int)ans;
    };
    return DFS(0, m - 1, 0, n - 1);
}

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    //freopen("inpt.txt", "r", stdin);
    //freopen("out.txt", "w", stdout);

    //int tt; cin >> tt;
    string s = "RUN";
    if(s == "RUN"){
        int n, m; cin >> n >> m;
        vector<vector<int>> table(n, vector<int>(m));
        for(int i = 0; i < n; i++){
            for(int j = 0; j < m; j++) cin >> table[i][j];
        }
        cout << solve2(table)<< endl;
        return 0;
    }/*
    int tt = 100000;
    for(int t = 1; t <= tt; t++){
        int n = gen() % 2 + 2;
        int m = gen() % 2 + 2;
        vector<vector<int>> table(n, vector<int>(m));
        for(int i = 0; i < n; i++){
            for(int j = 0; j < m; j++) table[i][j] = gen() % 3 + 1;
        }
        ll ans1 = solve(table);
        ll ans2 = solve2(table);
        if(ans1 != ans2){
            cout << n << " "<< m << endl;
            for(auto v : table){
                for(int x: v) cout << x << " ";
                cout << endl;
            }
            cout << "Ans1 "<< ans1 << " ans2 "<< ans2 << endl;
            return 0;
        }
    }*/
}

• Subtask 1: 25 / 100