Submission #1277202

#	Time	Username	Problem	Language	Result	Execution time	Memory
1277202		dosts	Netrpeljivost (COI23_netrpeljivost)	C++20	59 / 100	1594 ms	66092 KiB

Main

#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
#define int long long
#define pii pair<int,int>
#define vi vector<int>
#define ff first
#define ss second
#define sp << " " <<
#define all(x) x.begin(),x.end()
#define big(x) ((int)(x.size()))
using namespace std;
const int MOD = 1e9+7, LIM = 1e6+1, inf = 2e18;

const int N = (1LL<<11);

void solve() {
    int n;
    cin >> n;
    int f[n][n];
    int cost[n][n];
    for (int i = 0;i<n;i++) {
        for (int j = 0;j<n;j++) {
            cin >> cost[i][j];
        }
    }
    for (int i = 0;i<n;i++) {
        for (int j = 0;j<n;j++) f[i][j]= inf;
    }

    int lgs[n+1];
    lgs[1] = 0;
    for (int i=2;i<=n;i++) lgs[i] = lgs[i>>1]+1;
    for (int le = n-1;le>=0;le--) {
        for (int ri = le;ri < n;ri++) {
            int len = ri-le+1;
            if ((1<<lgs[len]) != len) continue;
            if (le%len != 0) continue;
            if (len == n) continue;
            if (len == 1) {
                f[le][ri] = 0;
                continue;
            }
            if (len == 2) {
                f[le][le+1] = f[le+1][le] = cost[le][le+1];
                continue;
            }
            int mid = (le+ri) >> 1;
            for (int r = ri;r >= mid+1;r--) {
                for (int a = le;a <= mid;a++) {
                    int mn = inf;
                    for (int b = mid+1;b<=ri;b++) {
                        int chunk = (1<<lgs[b^r]+1);
                        if (chunk <= len/4 || b == r) {
                            continue;
                        }
                        mn = min(mn,cost[a][b]+f[b][r]);
                    }
                    for (int l = le;l<=mid;l++) {
                        int chunk = (1<<lgs[a^l]+1);
                        if (chunk <= len/4 || a == l) { 
                            continue;
                        }
                        f[l][r] = min(f[l][r],f[l][a]+mn);
                    }
                }
            }

            for (int l = le;l<=mid;l++) {
                for (int r = mid+1;r<=ri;r++) {
                    f[r][l] = f[l][r];
                }
            }
        }
    }
    int mn = inf;
    vi mns(n+1),mns2(n+1);
    for (int i = 0;i<n/2;i++) {
        int mn1 = inf;
        for (int j = 0;j<n/2;j++) {
            int chunk = (1<<lgs[i^j]+1);
            if (chunk <= n/4 || i == j) {
                continue;
            }
            mn1 = min(mn1,f[j][i]);
        }
        mns[i] = mn1;
    }
    for (int i = n/2;i<n;i++) {
        int mn2 = inf;
        for (int j = n/2;j<n;j++) {
            int chunk = (1<<lgs[i^j]+1);
            if (chunk <= n/4 || i == j) {
                continue;
            }
            mn2 = min(mn2,f[i][j]);
        }
        mns2[i] = mn2;
    }
    for (int i = 0;i<n/2;i++)  {
        for (int j = n/2;j<n;j++) {
            mn = min(mn,mns[i]+mns2[j]+cost[i][j]);
        }
    }
    cout << mn << '\n';
} 

signed main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    #ifdef Dodi
    freopen("in.txt", "r", stdin);
    freopen("out.txt", "w", stdout);
    #endif
    int t = 1;
    //cin >> t;
    while (t --> 0) solve();
}

• Subtask 1: 10 / 10
• Subtask 2: 17 / 17
• Subtask 3: 32 / 32
• Subtask 4: 0 / 41