select

贪心先选列，再选行，再将交叉的减去

#include<cstdio>#include<algorithm>#include<queue> #define ll long longusing namespace std;int n,m,k,p; ll f[1999999],f2[1999999],ans=-1e16,a[1999999],b[1999999];priority_queue<ll> q1, q2;int main(){    freopen("select.in","r",stdin);    freopen("select.out","w",stdout);    scanf("%d%d%d%d",&n,&m,&k,&p);    for(int i=1;i<=n;i++)    for(int j=1;j<=m;j++){        int x;        scanf("%d",&x);        a[i]+=x;        b[j]+=x;    }    for(int i=1;i<=n;i++) q1.push(a[i]);    for(int i=1;i<=m;i++) q2.push(b[i]);    for(int i=1;i<=k;i++){        ll x=q1.top();q1.pop();        f[i]=f[i-1]+x;        x-=m*p;q1.push(x);    }    for(int i=1;i<=k;i++){        ll x=q2.top();q2.pop();        f2[i]=f2[i-1]+x;        x-=n*p;q2.push(x);    }    for(int i=0;i<=k;i++) ans=max(ans,f[i]+f2[k-i]-1ll*i*(k-i)*p);    printf("%lld",ans);}