Submission #334324

#	Time	Username	Problem	Language	Result	Execution time	Memory
334324		beksultan04	Chessboard (IZhO18_chessboard)	C++14	39 / 100	76 ms	25464 KiB

chessboard

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define OK puts("OK");
#define fr first
#define sc second
#define ret return
#define scan1(a) scanf("%lld",&a);
#define scan2(a,b) scanf("%lld %lld",&a, &b);
#define scan3(a,b,c) scanf("%lld %lld %lld",&a,&b,&c);
#define all(s) s.begin(),s.end()
#define pb push_back
#define endi puts("");
const int N = 1e5+12,INF=1e9+7;
int q[2501][2501],dp[2501][2501],resh[N],ans[N],n;

int sum(int x1,int y1,int x2,int y2){
    ret dp[x2][y2]+dp[x1][y1]-dp[x1][y2]-dp[x2][y1];
}

int fun(int x){
    int i,j,ans=0,res=0,c=1;
    for (i=0;i<n;i+=x){
        if (c%2)
            for (j=0;j<n;j+=x*2){
                res += x*x-sum(i,j,i+x,j+x);
            }
        else {
            for (j=x;j<n;j+=x*2){
                res += x*x-sum(i,j,i+x,j+x);
            }

        }
        c++;
    }
    c=0;
    for (i=0;i<n;i+=x){
        if (c%2)
            for (j=0;j<n;j+=x*2){
                res += sum(i,j,i+x,j+x);
            }
        else {
            for (j=x;j<n;j+=x*2){
                res += sum(i,j,i+x,j+x);
            }

        }
        c++;
    }
    ret (res);

}
int fun1(int x){
    int i,j,ans=0,res=0,c=0;
    for (i=0;i<n;i+=x){
        if (c%2)
            for (j=0;j<n;j+=x*2){
                res += x*x-sum(i,j,i+x,j+x);
            }
        else {
            for (j=x;j<n;j+=x*2){
                res += x*x-sum(i,j,i+x,j+x);
            }

        }
        c++;
    }
    c=1;
    for (i=0;i<n;i+=x){
        if (c%2)
            for (j=0;j<n;j+=x*2){
                res += sum(i,j,i+x,j+x);
            }
        else {
            for (j=x;j<n;j+=x*2){
                res += sum(i,j,i+x,j+x);
            }

        }
        c++;
    }
    ret (res);

}

main(){
    int k,i,j;
    vector <int> v;
    scan2(n,k)

    while (k--){
        int x1,x2,y1,y2;
        scan2(x1,y1)
        scan2(x2,y2)
        q[x1][y1]++;
        q[x2+1][y2+1]++;
        q[x1][y2+1]--;
        q[x2+1][y1]--;
    }
    for (i=1;i<=n;++i){
        for (j=1;j<=n;++j){
            q[i][j]+=q[i-1][j]+q[i][j-1]-q[i-1][j-1];
        }
    }
    for (i=1;i<=n;++i){
        for (j=1;j<=n;++j){
            dp[i][j] = dp[i][j-1]+dp[i-1][j]-dp[i-1][j-1]+q[i][j];
        }
    }

    for (i=2;i*i<=n;++i){
        if (n%i==0){
            v.pb(i);
            if (i*i != n)v.pb(n/i);
        }
    }
    int ans=min(fun(1),fun1(1));
    for (i=0;i<v.size();++i){
        ans = min(ans,min(fun(v[i]),fun1(v[i])));
    }
    cout <<ans;

}

Compilation message (stderr)

chessboard.cpp: In function 'long long int fun(long long int)':
chessboard.cpp:23:13: warning: unused variable 'ans' [-Wunused-variable]
   23 |     int i,j,ans=0,res=0,c=1;
      |             ^~~
chessboard.cpp: In function 'long long int fun1(long long int)':
chessboard.cpp:55:13: warning: unused variable 'ans' [-Wunused-variable]
   55 |     int i,j,ans=0,res=0,c=0;
      |             ^~~
chessboard.cpp: At global scope:
chessboard.cpp:87:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   87 | main(){
      |      ^
chessboard.cpp: In function 'int main()':
chessboard.cpp:119:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  119 |     for (i=0;i<v.size();++i){
      |              ~^~~~~~~~~
chessboard.cpp:10:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 | #define scan2(a,b) scanf("%lld %lld",&a, &b);
      |                    ~~~~~^~~~~~~~~~~~~~~~~~~~
chessboard.cpp:90:5: note: in expansion of macro 'scan2'
   90 |     scan2(n,k)
      |     ^~~~~
chessboard.cpp:10:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 | #define scan2(a,b) scanf("%lld %lld",&a, &b);
      |                    ~~~~~^~~~~~~~~~~~~~~~~~~~
chessboard.cpp:94:9: note: in expansion of macro 'scan2'
   94 |         scan2(x1,y1)
      |         ^~~~~
chessboard.cpp:10:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 | #define scan2(a,b) scanf("%lld %lld",&a, &b);
      |                    ~~~~~^~~~~~~~~~~~~~~~~~~~
chessboard.cpp:95:9: note: in expansion of macro 'scan2'
   95 |         scan2(x2,y2)
      |         ^~~~~

• Subtask 1: 8 / 8
• Subtask 2: 0 / 8
• Subtask 3: 15 / 15
• Subtask 4: 16 / 16
• Subtask 5: 0 / 23
• Subtask 6: 0 / 30