oj.uz

Submission #500588

# Submission time Handle Problem Language Result Execution time Memory
500588 2021-12-31T13:13:15 Z dostigator Chessboard (IZhO18_chessboard) C++17
70 / 100
 228 ms 1864 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-1;
        for(ll d=1; d*d<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});

            ll f=n/d;
            m=n/f;
            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+(f-1))/f;
                y=(y+(f-1))/f;
                if((x+y)%2==0) res1++;
                else res2++;
            }
            if(d==1){
                ans=min(ans,max(res1+((n/f)*(n/f))/2*f*f-res2,res2+((n/f)*(n/f)+1)/2*f*f-res1));
                continue;
            }
            ans=min({ans,res1+((n/f)*(n/f))/2*f*f-res2,res2+((n/f)*(n/f)+1)/2*f*f-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: variable 'm' set but not used [-Wunused-but-set-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 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
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 204 KB Output is correct
2 Correct 5 ms 280 KB Output is correct
3 Correct 15 ms 320 KB Output is correct
4 Correct 14 ms 320 KB Output is correct
5 Correct 17 ms 316 KB Output is correct
6 Correct 13 ms 324 KB Output is correct
7 Correct 4 ms 204 KB Output is correct
8 Correct 10 ms 216 KB Output is correct
9 Correct 31 ms 204 KB Output is correct
10 Correct 18 ms 320 KB Output is correct

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 0 ms 204 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 208 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 1 ms 204 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 0 ms 204 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 208 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 1 ms 204 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 716 KB Output is correct
17 Correct 18 ms 204 KB Output is correct
18 Correct 28 ms 1780 KB Output is correct
19 Correct 53 ms 1588 KB Output is correct
20 Correct 63 ms 1844 KB Output is correct
21 Correct 26 ms 204 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 15 ms 972 KB Output is correct
24 Correct 29 ms 1668 KB Output is correct
25 Correct 3 ms 332 KB Output is correct
26 Correct 16 ms 1172 KB Output is correct
27 Correct 22 ms 1356 KB Output is correct
28 Correct 27 ms 1712 KB Output is correct
29 Correct 8 ms 204 KB Output is correct
30 Correct 1 ms 332 KB Output is correct

Subtask #5
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 204 KB Output is correct
2 Correct 5 ms 280 KB Output is correct
3 Correct 15 ms 320 KB Output is correct
4 Correct 14 ms 320 KB Output is correct
5 Correct 17 ms 316 KB Output is correct
6 Correct 13 ms 324 KB Output is correct
7 Correct 4 ms 204 KB Output is correct
8 Correct 10 ms 216 KB Output is correct
9 Correct 31 ms 204 KB Output is correct
10 Correct 18 ms 320 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 208 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 0 ms 204 KB Output is correct
23 Correct 1 ms 204 KB Output is correct
24 Correct 1 ms 332 KB Output is correct
25 Correct 1 ms 332 KB Output is correct
26 Correct 8 ms 716 KB Output is correct
27 Correct 18 ms 204 KB Output is correct
28 Correct 28 ms 1780 KB Output is correct
29 Correct 53 ms 1588 KB Output is correct
30 Correct 63 ms 1844 KB Output is correct
31 Correct 26 ms 204 KB Output is correct
32 Correct 1 ms 204 KB Output is correct
33 Correct 15 ms 972 KB Output is correct
34 Correct 29 ms 1668 KB Output is correct
35 Correct 3 ms 332 KB Output is correct
36 Correct 16 ms 1172 KB Output is correct
37 Correct 22 ms 1356 KB Output is correct
38 Correct 27 ms 1712 KB Output is correct
39 Correct 8 ms 204 KB Output is correct
40 Correct 1 ms 332 KB Output is correct
41 Correct 50 ms 1600 KB Output is correct
42 Correct 31 ms 1732 KB Output is correct
43 Correct 50 ms 1604 KB Output is correct
44 Correct 33 ms 1728 KB Output is correct
45 Correct 26 ms 332 KB Output is correct
46 Correct 58 ms 1628 KB Output is correct
47 Correct 23 ms 204 KB Output is correct
48 Correct 33 ms 1616 KB Output is correct
49 Correct 29 ms 1560 KB Output is correct
50 Correct 210 ms 1720 KB Output is correct
51 Correct 212 ms 1732 KB Output is correct
52 Correct 196 ms 1708 KB Output is correct
53 Correct 213 ms 1796 KB Output is correct
54 Correct 190 ms 1636 KB Output is correct
55 Correct 228 ms 1864 KB Output is correct
56 Correct 198 ms 1648 KB Output is correct

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 Correct 25 ms 204 KB Output is correct
10 Correct 5 ms 280 KB Output is correct
11 Correct 15 ms 320 KB Output is correct
12 Correct 14 ms 320 KB Output is correct
13 Correct 17 ms 316 KB Output is correct
14 Correct 13 ms 324 KB Output is correct
15 Correct 4 ms 204 KB Output is correct
16 Correct 10 ms 216 KB Output is correct
17 Correct 31 ms 204 KB Output is correct
18 Correct 18 ms 320 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 0 ms 204 KB Output is correct
21 Correct 0 ms 204 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 1 ms 204 KB Output is correct
24 Correct 0 ms 204 KB Output is correct
25 Correct 1 ms 332 KB Output is correct
26 Correct 1 ms 208 KB Output is correct
27 Correct 0 ms 204 KB Output is correct
28 Correct 1 ms 204 KB Output is correct
29 Correct 1 ms 204 KB Output is correct
30 Correct 0 ms 204 KB Output is correct
31 Correct 1 ms 204 KB Output is correct
32 Correct 1 ms 332 KB Output is correct
33 Correct 1 ms 332 KB Output is correct
34 Correct 8 ms 716 KB Output is correct
35 Correct 18 ms 204 KB Output is correct
36 Correct 28 ms 1780 KB Output is correct
37 Correct 53 ms 1588 KB Output is correct
38 Correct 63 ms 1844 KB Output is correct
39 Correct 26 ms 204 KB Output is correct
40 Correct 1 ms 204 KB Output is correct
41 Correct 15 ms 972 KB Output is correct
42 Correct 29 ms 1668 KB Output is correct
43 Correct 3 ms 332 KB Output is correct
44 Correct 16 ms 1172 KB Output is correct
45 Correct 22 ms 1356 KB Output is correct
46 Correct 27 ms 1712 KB Output is correct
47 Correct 8 ms 204 KB Output is correct
48 Correct 1 ms 332 KB Output is correct
49 Correct 50 ms 1600 KB Output is correct
50 Correct 31 ms 1732 KB Output is correct
51 Correct 50 ms 1604 KB Output is correct
52 Correct 33 ms 1728 KB Output is correct
53 Correct 26 ms 332 KB Output is correct
54 Correct 58 ms 1628 KB Output is correct
55 Correct 23 ms 204 KB Output is correct
56 Correct 33 ms 1616 KB Output is correct
57 Correct 29 ms 1560 KB Output is correct
58 Correct 210 ms 1720 KB Output is correct
59 Correct 212 ms 1732 KB Output is correct
60 Correct 196 ms 1708 KB Output is correct
61 Correct 213 ms 1796 KB Output is correct
62 Correct 190 ms 1636 KB Output is correct
63 Correct 228 ms 1864 KB Output is correct
64 Correct 198 ms 1648 KB Output is correct
65 Correct 0 ms 204 KB Output is correct
66 Incorrect 0 ms 204 KB Output isn't correct
67 Halted 0 ms 0 KB -