Submission #378584

#	Time	Username	Problem	Language	Result	Execution time	Memory
378584		i_am_noob	Chessboard (IZhO18_chessboard)	C++17	100 / 100	1548 ms	4036 KiB

chessboard

#include<bits/stdc++.h>
using namespace std;

#define int long long
#define rep(n) rep1(i,n)
#define rep1(i,n) rep2(i,0,n)
#define rep2(i,a,b) for(int i=a; i<b; ++i)
#define rep3(i,a,b) for(int i=a; i>=b; --i)
#define sz(a) ((int)a.size())
#define all(a) a.begin(),a.end()
#define pow2(x) (1ll<<(x))

#ifdef i_am_noob
#define bug(...) cerr << "#" << __LINE__ << ' ' << #__VA_ARGS__ << "- ", _do(__VA_ARGS__)
template<typename T> void _do(T && x){cerr << x << endl;}
template<typename T, typename ...S> void _do(T && x, S&&... y){cerr << x << ' ',_do(y...);}
#else
#define bug(...) 826
#endif

const int maxn=100005;
const int mod=1000000007;
#define y1 hhhhaura_TOI_2J

int n,k,x1[maxn],x2[maxn],y1[maxn],y2[maxn],area,ans=1e18;

inline int calc(int t, int x, int y){
    if(x<0||y<0) return 0;
    int a=x/t,b=y/t,res=(x/t)*(y/t)/2*t*t;
    int c=a&1?(b+1)/2*t:b/2*t;
    c+=y%t+1;
    int d=b&1?(a+1)/2*t:a/2*t;
    d+=x%t+1;
    if(x==2&&y==2) bug(c,d);
    if((a+b)&1) return res+c*d-(c-y%t-1)*(d-x%t-1);
    return res+c*d-(c-y%t-1)*(d-x%t-1)-(x%t+1)*(y%t+1);
}

inline int calc1(int t, int id){
    return calc(t,x2[id],y2[id])-calc(t,x1[id]-1,y2[id])-calc(t,x2[id],y1[id]-1)+calc(t,x1[id]-1,y1[id]-1);
}

inline int calc2(int t, int id){
    return (x2[id]-x1[id]+1)*(y2[id]-y1[id]+1)-calc1(t,id);
}

signed main(){
    ios_base::sync_with_stdio(0),cin.tie(0);
    #ifdef i_am_noob
    freopen("input1.txt","r",stdin);
    freopen("output1.txt","w",stdout);
    freopen("output2.txt","w",stderr);
    #endif
    cin >> n >> k;
    rep(k) cin >> x1[i] >> y1[i] >> x2[i] >> y2[i];
    rep(k) x1[i]--,y1[i]--,x2[i]--,y2[i]--;
    rep(k) area+=(x2[i]-x1[i]+1)*(y2[i]-y1[i]+1);
    rep(5) rep1(j,5){
        int tmp=calc(2,i,j);
        bug(i,j,tmp);
    }
    rep2(i,1,n) if(n%i==0){
        int val=0;
        rep1(j,k) val+=calc1(i,j);
        //area-val good
        //cnt(black)-(area-val)
        bug(val);
        val+=((n/i)&1?((n/i)*(n/i)+1)/2*i*i:(n/i)*(n/i)/2*i*i)-area+val;
        ans=min(ans,val);
        bug(val);
        val=0;
        rep1(j,k) val+=calc2(i,j);
        bug(val);
        val+=(n/i)*(n/i)/2*i*i-area+val;
        ans=min(ans,val);
        bug(val);
    }
    cout << ans << "\n";
}

Compilation message (stderr)

chessboard.cpp: In function 'long long int calc(long long int, long long int, long long int)':
chessboard.cpp:18:18: warning: statement has no effect [-Wunused-value]
   18 | #define bug(...) 826
      |                  ^~~
chessboard.cpp:34:20: note: in expansion of macro 'bug'
   34 |     if(x==2&&y==2) bug(c,d);
      |                    ^~~
chessboard.cpp: In function 'int main()':
chessboard.cpp:18:18: warning: statement has no effect [-Wunused-value]
   18 | #define bug(...) 826
      |                  ^~~
chessboard.cpp:60:9: note: in expansion of macro 'bug'
   60 |         bug(i,j,tmp);
      |         ^~~
chessboard.cpp:59:13: warning: unused variable 'tmp' [-Wunused-variable]
   59 |         int tmp=calc(2,i,j);
      |             ^~~
chessboard.cpp:18:18: warning: statement has no effect [-Wunused-value]
   18 | #define bug(...) 826
      |                  ^~~
chessboard.cpp:67:9: note: in expansion of macro 'bug'
   67 |         bug(val);
      |         ^~~
chessboard.cpp:18:18: warning: statement has no effect [-Wunused-value]
   18 | #define bug(...) 826
      |                  ^~~
chessboard.cpp:70:9: note: in expansion of macro 'bug'
   70 |         bug(val);
      |         ^~~
chessboard.cpp:18:18: warning: statement has no effect [-Wunused-value]
   18 | #define bug(...) 826
      |                  ^~~
chessboard.cpp:73:9: note: in expansion of macro 'bug'
   73 |         bug(val);
      |         ^~~
chessboard.cpp:18:18: warning: statement has no effect [-Wunused-value]
   18 | #define bug(...) 826
      |                  ^~~
chessboard.cpp:76:9: note: in expansion of macro 'bug'
   76 |         bug(val);
      |         ^~~

• Subtask 1: 8 / 8
• Subtask 2: 8 / 8
• Subtask 3: 15 / 15
• Subtask 4: 16 / 16
• Subtask 5: 23 / 23
• Subtask 6: 30 / 30