Lydsy3032 七夕祭（货仓选址+均分纸牌结合）

环形均分纸牌

#include<cstdio>
#include<cmath>
#include<algorithm>
using namespace std;

typedef long long ll;

const int maxn=100000+10;
ll heng[maxn],shu[maxn];
ll sum[maxn];

ll getans(ll a[maxn],int n){
   ll k=a[0]/n;
   for (int i=1;i<=n;i++){
        a[i]=a[i]-k;
        sum[i]=sum[i-1]+a[i];
   }
   ll ans=0;
   sort(sum+1,sum+1+n);
   for (int i=1;i<=n;i++) ans+=abs(sum[i]-sum[n+1>>1]);
   return ans;
}

int main(){
    int m,n,t;
    int u,v;
    scanf("%d%d%d",&n,&m,&t);
    for (int i=1;i<=t;i++){
        scanf("%d%d",&u,&v);
        heng[u]++;
        shu[v]++;
    }
    for (int i=1;i<=n;i++) heng[0]+=heng[i];
    for (int i=1;i<=m;i++) shu[0]+=shu[i];
    if(heng[0]%n==0&&shu[0]%m==0){
        printf("both %lld
",getans(heng,n)+getans(shu,m));
    }
    else if(heng[0]%n==0){
        printf("row %lld
",getans(heng,n));
    }
    else if(shu[0]%m==0){
       printf("column %lld
",getans(shu,m));
    }
    else printf("impossible
");
return 0;
}