oj.uz

Submission #500488

# Submission time Handle Problem Language Result Execution time Memory
500488 2021-12-31T07:38:56 Z dostigator Chessboard (IZhO18_chessboard) C++14
39 / 100
 62 ms 3428 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;}
ll n,k;
pll gg[N];
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(n<=1e5){
        for(ll i=1; i<=k; ++i){
            ll x,y,tox,toy;
            cin>>x>>y>>tox>>toy;
            gg[i]={x,y};
        }
        ll ans=mod-10;
        for(ll d=1; d*d<=n; ++d){
            if(n%d!=0) continue;
            ll m=n/d;
            ll res=(d*d)*((m*m)/2),res2;
            res2=res+((m%2)*(d*d));
            for(ll i=1; i<=k; ++i){
                ll x,y;
                tie(x,y)=gg[i];
                x=(x+(d-1))/d;
                y=(y+(d-1))/d;
                if((x+y)%2==0){
                    res2--;
                    res++;
                }
                if((x+y)%2==1){
                    res--;
                    res2++;
                }
            }
            ans=min({ans,res,res2});
            m=n/(n/d);
            res=((n/d)*(n/d))*((m*m)/2);
            res2=res+(((m%2)*((n/d)*(n/d))));
            for(ll i=1; i<=k; ++i){
                ll x,y;
                tie(x,y)=gg[i];
                x=(x+((n/d)-1))/(n/d);
                y=(y+((n/d)-1))/(n/d);
                if((x+y)%2==0){
                    res2--;
                    res++;
                }
                if((x+y)%2==1){
                    res--;
                    res2++;
                }
            }
            if(d==1){
                ans=min(ans,max(res,res2));
                continue;
            }
            ans=min({ans,res,res2});
        }
        cout<<ans<<endl;
        return;
    }
    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);
}
/*
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 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 22 ms 1176 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
15.0 / 15.0

# 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 1 ms 320 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 328 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 1 ms 324 KB Output is correct
12 Correct 0 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct

Subtask #4
16.0 / 16.0

# 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 1 ms 320 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 328 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 1 ms 324 KB Output is correct
12 Correct 0 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 8 ms 1100 KB Output is correct
17 Correct 22 ms 2952 KB Output is correct
18 Correct 28 ms 3428 KB Output is correct
19 Correct 60 ms 3008 KB Output is correct
20 Correct 62 ms 3328 KB Output is correct
21 Correct 21 ms 2824 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 16 ms 1604 KB Output is correct
24 Correct 25 ms 3076 KB Output is correct
25 Correct 3 ms 460 KB Output is correct
26 Correct 17 ms 1980 KB Output is correct
27 Correct 22 ms 2432 KB Output is correct
28 Correct 29 ms 3260 KB Output is correct
29 Correct 9 ms 1316 KB Output is correct
30 Correct 1 ms 336 KB Output is correct

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 22 ms 1176 KB Output isn't correct
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 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Incorrect 22 ms 1176 KB Output isn't correct
10 Halted 0 ms 0 KB -