Submission #223572

#	Time	Username	Problem	Language	Result	Execution time	Memory
223572		MKopchev	Popeala (CEOI16_popeala)	C++14	17 / 100	2073 ms	4932 KiB

popeala

#include<bits/stdc++.h>
using namespace std;
const int nmax=50+5,tmax=20000+5,inf=2e9+42;

int n,tasks,want;

int points[tmax];

bool solved[nmax][tmax];

int prv_bad[nmax][tmax];

int pref[nmax];

int ask(int l,int r)
{
    int ret=0,sum=pref[r]-pref[l-1];

    for(int i=1;i<=n;i++)
        if(prv_bad[i][r]<l)ret=ret+sum;

    return ret;
}

int dp[nmax][tmax];

int moments[nmax];

int tree[nmax][1<<16];

void update(int which,int node,int l,int r,int pos,int val)
{
    if(l==r)
    {
        tree[which][node]=val;
        return;
    }

    int av=(l+r)/2;
    if(pos<=av)update(which,node*2,l,av,pos,val);
    else update(which,node*2+1,av+1,r,pos,val);

    tree[which][node]=min(tree[which][node*2],tree[which][node*2+1]);
}

int query(int which,int node,int l,int r,int lq,int rq)
{
    if(l==lq&&r==rq)return tree[which][node];

    int av=(l+r)/2,ret=inf;

    if(lq<=av)ret=min(ret,query(which,node*2,l,av,lq,min(av,rq)));
    if(av<rq)ret=min(ret,query(which,node*2+1,av+1,r,max(av+1,lq),rq));
    return ret;
}
int main()
{
    scanf("%i%i%i",&n,&tasks,&want);

    for(int i=1;i<=tasks;i++)scanf("%i",&points[i]);

    for(int i=1;i<=tasks;i++)pref[i]=pref[i-1]+points[i];

    for(int i=1;i<=n;i++)
        for(int j=1;j<=tasks;j++)
        {
            char in=getchar();
            while(in!='0'&&in!='1')in=getchar();

            if(in=='1')solved[i][j]=1;
        }

    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=tasks;j++)
            if(solved[i][j]==0)prv_bad[i][j]=j;
            else prv_bad[i][j]=prv_bad[i][j-1];
    }
    /*
    for(int i=1;i<=n;i++)
        for(int j=1;j<=tasks;j++)
            cout<<i<<" "<<j<<" -> "<<nxt_bad[i][j]<<endl;
    */
    for(int i=1;i<=tasks;i++)
        dp[0][i]=inf;

    for(int sub=1;sub<=want;sub++)
    {
        dp[sub][0]=inf;

        for(int w=0;w<=n;w++)
            for(int cur=1;cur<=tasks;cur++)
            update(w,1,1,tasks,cur,dp[sub-1][cur-1]-w*pref[cur-1]);

        for(int i=1;i<=tasks;i++)
        {
            dp[sub][i]=inf;

            if(sub>i)continue;

            for(int j=1;j<=n;j++)moments[j]=prv_bad[j][i];

            sort(moments+1,moments+n+1);

            moments[n+1]=i;

            for(int w=n;w>=0;w--)
            {
                int lhs=moments[w]+1,rhs=moments[w+1];

                if(lhs>rhs)continue;

                dp[sub][i]=min(dp[sub][i],query(w,1,1,tasks,lhs,rhs)+w*pref[i]);
            }
            //cout<<sub<<" "<<i<<" -> "<<dp[sub][i]<<endl;
        }
        printf("%i\n",dp[sub][tasks]);
    }

    return 0;
}

Compilation message (stderr)

popeala.cpp: In function 'int main()':
popeala.cpp:58:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%i%i%i",&n,&tasks,&want);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
popeala.cpp:60:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i=1;i<=tasks;i++)scanf("%i",&points[i]);
                              ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 9 / 9
• Subtask 3: 0 / 9
• Subtask 4: 0 / 74