oj.uz

Submission #500337

# Submission time Handle Problem Language Result Execution time Memory
500337 2021-12-30T18:43:45 Z dostigator Chessboard (IZhO18_chessboard) C++14
39 / 100
 161 ms 8140 KB 
// author : lox
#pragma GCC optimize("O3")
#pragma GCC target("popcnt")
#include <bits/stdc++.h>
using namespace std;
#define IZhO_SILVER ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define popcnt __builtin_popcount
#define all(a) a.begin(),a.end()
#define low_b lower_bound
#define up_b upper_bound
#define vii vector<pair<ll,ll>>
#define vll vector<pair<ll,ll>>
#define pii pair<ll,ll>
#define mii map<ll,ll>
#define pll pair<ll,ll>
#define mll map<ll,ll>
#define vi vector<ll>
#define vl vector<ll>
#define pb push_back
#define endl '\n'
#define Y second
#define X first
typedef long double ld;
typedef long long ll;
const long long dx[4]={1,-1,0,0},dy[4]={0,0,1,-1},col=107,N=1e6+777;
const ll mod=1e9+7,inf=1e18;
void fre_open(){freopen("file.in","r",stdin);freopen("file.out","w",stdout);}
ll binpow(ll n,ll k){if(k<0)return 0ll;if(k==0)return 1ll;if(k%2)return (binpow(n,k-1)*n)%mod;ll kk=binpow(n,k/2)%mod;return (kk*kk)%mod;}
int a[2001][2001];
int n,k;
ll pr(ll x){
    for(ll i=1; i*i<=x; ++i) if(x%i==0)return 0ll;
    return 1ll;
}
void solve(){
    cin>>n>>k;
    if(k==0){
        ll x=n*n/2;
        for(ll i=n/2; i>=1; --i)if(n%i==0)x=min(x,i*i*((n/i)*(n/i)/2));
        cout<<x;
        return;
    }
    if(pr(n)){

        ll x=n*n/2;
        ll x2=x+1;
        for(ll c=0, i1,i2,j1,j2;c<k; ++c){
            cin>>i1>>j1>>i2>>j2;
            for(ll i=i1; i<=i2; ++i)
                for(ll j=j1; j<=j2; ++j)
                {
                    if(i%2==j%2) x++,x2--;
                    if(i%2!=j%2) x2++,x--;
                }
        }
        cout<<min(x,x2);
        return;
    }
    for(int i=1; i<=k; ++i){
        ll x,y,tox,toy;
        cin>>x>>y>>tox>>toy;
        a[x][y]=1;
    }
    int ans=mod;
    for(int d=1; d*d<=n; ++d){
        if(n%d!=0) continue;
        int res=0,res2=0;
        for(int i=1; i<=n; ++i){
            for(int j=1; j<=n; ++j){
                int x=(i+(d-1))/d;
                int y=(j+(d-1))/d;
                if((x+y)%2 && a[i][j]) ++res2;
                if((x+y)%2 && !a[i][j]) ++res;
                if(!((x+y)%2) && a[i][j]) ++res;
                if(!((x+y)%2) && !a[i][j]) ++res2;
            }
        }
        ans=min({ans,res,res2});
        //cout<<d<<' '<<res<<' '<<res2<<endl;
        int f=n/d;
        res=0,res2=0;
        for(int i=1; i<=n; ++i){
            for(int j=1; j<=n; ++j){
                int x=(i+(f-1))/f;
                int y=(j+(f-1))/f;
                if((x+y)%2 && a[i][j]) ++res2;
                if((x+y)%2 && !a[i][j]) ++res;
                if(!((x+y)%2) && a[i][j]) ++res;
                if(!((x+y)%2) && !a[i][j]) ++res2;
            }
        }
        if(d==1){
            ans=min(ans,max(res,res2));
            continue;
        }
        ans=min({ans,res,res2});
        //cout<<d<<' '<<res<<' '<<res2<<endl;
    }
    cout<<ans<<endl;
}
/*
6 8
3 3 3 3
1 2 1 2
3 4 3 4
5 5 5 5
4 3 4 3
4 4 4 4
2 1 2 1
3 6 3 6*/
int main() {
    //fre_open();
    IZhO_SILVER;
    ll tt=1;
    //cin>>tt;
    while(tt--) solve();
}

Compilation message

chessboard.cpp: In function 'void fre_open()':
chessboard.cpp:27:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 | void fre_open(){freopen("file.in","r",stdin);freopen("file.out","w",stdout);}
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
chessboard.cpp:27:53: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 | void fre_open(){freopen("file.in","r",stdin);freopen("file.out","w",stdout);}
      |                                              ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 0 ms 276 KB Output is correct

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 460 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 588 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 588 KB Output is correct
4 Correct 1 ms 588 KB Output is correct
5 Correct 1 ms 588 KB Output is correct
6 Correct 1 ms 588 KB Output is correct
7 Correct 1 ms 588 KB Output is correct
8 Correct 1 ms 588 KB Output is correct
9 Correct 1 ms 588 KB Output is correct
10 Correct 1 ms 460 KB Output is correct
11 Correct 1 ms 588 KB Output is correct
12 Correct 0 ms 460 KB Output is correct
13 Correct 1 ms 588 KB Output is correct
14 Correct 1 ms 588 KB Output is correct
15 Correct 1 ms 460 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 588 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 588 KB Output is correct
4 Correct 1 ms 588 KB Output is correct
5 Correct 1 ms 588 KB Output is correct
6 Correct 1 ms 588 KB Output is correct
7 Correct 1 ms 588 KB Output is correct
8 Correct 1 ms 588 KB Output is correct
9 Correct 1 ms 588 KB Output is correct
10 Correct 1 ms 460 KB Output is correct
11 Correct 1 ms 588 KB Output is correct
12 Correct 0 ms 460 KB Output is correct
13 Correct 1 ms 588 KB Output is correct
14 Correct 1 ms 588 KB Output is correct
15 Correct 1 ms 460 KB Output is correct
16 Correct 33 ms 7452 KB Output is correct
17 Correct 40 ms 7996 KB Output is correct
18 Correct 53 ms 8040 KB Output is correct
19 Correct 158 ms 7588 KB Output is correct
20 Correct 161 ms 7676 KB Output is correct
21 Correct 38 ms 7964 KB Output is correct
22 Correct 95 ms 1908 KB Output is correct
23 Correct 54 ms 7684 KB Output is correct
24 Correct 48 ms 8140 KB Output is correct
25 Correct 45 ms 7064 KB Output is correct
26 Correct 36 ms 7572 KB Output is correct
27 Correct 47 ms 7628 KB Output is correct
28 Correct 47 ms 7628 KB Output is correct
29 Correct 22 ms 7668 KB Output is correct
30 Correct 24 ms 5452 KB Output is correct

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 460 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 0 ms 276 KB Output is correct
9 Runtime error 1 ms 460 KB Execution killed with signal 11
10 Halted 0 ms 0 KB -