oj.uz

Submission #500582

# Submission time Handle Problem Language Result Execution time Memory
500582 2021-12-31T13:00:42 Z dostigator Chessboard (IZhO18_chessboard) C++17
16 / 100
 31 ms 2344 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];
bool pr(ll x){//correct
    for(ll i=2; i*i<=x; ++i){
        if(x%i==0)return 0;
    }
    return 1;
}
void solve(){
    cin>>n>>k;
    if(k==0){//correct
        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)){//correct
        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;
    }
	if(n<=2e5){//?
        for(ll i=1; i<=k; ++i){//correct
            ll x,y,tox,toy;
            cin>>x>>y>>tox>>toy;
            gg[i]={x,y};
        }
        ll ans=inf;
        for(ll d=1; d<=n*n*n; ++d){
            if(n%d!=0) continue;
            ll m=n/d;
            ll res1=0,res2=0;
            for(ll i=1; i<=k; ++i){//correct, but not sure
                ll x,y;
                tie(x,y)=gg[i];
                x=(x+(d-1))/d;
                y=(y+(d-1))/d;
                if((x+y)%2==0) res1++;
                else res2++;
            }
            ans=min({ans,res1+((n/d)*(n/d))/2*d*d-res2,res2+((n/d)*(n/d)+1)/2*d*d-res1});
        }
        cout<<ans<<endl;
        return;
    }
}
/*
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 solve()':
chessboard.cpp:69:16: warning: unused variable 'm' [-Wunused-variable]
   69 |             ll m=n/d;
      |                ^
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 316 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
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 1736 KB Output is correct
2 Correct 5 ms 588 KB Output is correct
3 Correct 11 ms 1200 KB Output is correct
4 Correct 13 ms 1100 KB Output is correct
5 Correct 16 ms 1476 KB Output is correct
6 Correct 10 ms 1092 KB Output is correct
7 Correct 3 ms 460 KB Output is correct
8 Correct 11 ms 1144 KB Output is correct
9 Correct 31 ms 2344 KB Output is correct
10 Correct 19 ms 1456 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 324 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 324 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 1736 KB Output is correct
2 Correct 5 ms 588 KB Output is correct
3 Correct 11 ms 1200 KB Output is correct
4 Correct 13 ms 1100 KB Output is correct
5 Correct 16 ms 1476 KB Output is correct
6 Correct 10 ms 1092 KB Output is correct
7 Correct 3 ms 460 KB Output is correct
8 Correct 11 ms 1144 KB Output is correct
9 Correct 31 ms 2344 KB Output is correct
10 Correct 19 ms 1456 KB Output is correct
11 Incorrect 3 ms 324 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 316 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 Correct 22 ms 1736 KB Output is correct
10 Correct 5 ms 588 KB Output is correct
11 Correct 11 ms 1200 KB Output is correct
12 Correct 13 ms 1100 KB Output is correct
13 Correct 16 ms 1476 KB Output is correct
14 Correct 10 ms 1092 KB Output is correct
15 Correct 3 ms 460 KB Output is correct
16 Correct 11 ms 1144 KB Output is correct
17 Correct 31 ms 2344 KB Output is correct
18 Correct 19 ms 1456 KB Output is correct
19 Incorrect 3 ms 324 KB Output isn't correct
20 Halted 0 ms 0 KB -