Submission #1038699

#	Time	Username	Problem	Language	Result	Execution time	Memory
1038699		ibm2006	Two Dishes (JOI19_dishes)	C++17	74 / 100	3682 ms	291224 KiB

dishes

#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
const ll inf=1e18;
ll n,m,i,j,k,l,r,x,y,z,w,s,t,a[1100000],b[1100000],seg[2200000],lazy[2200000],c[1100000],d[1100000],cost[1100000],add_cost[1100000],dp[1100000];
ll sum1[1100000],range[1100000],sum2[1100000];
vector<ll> del_list[1100000];
set<pair<ll,ll>> chain;
pair<ll,ll> p,q;
pair<ll,ll> find_chain(ll x)
{
    pair<ll,ll> p=*(--chain.lower_bound(make_pair(x,inf)));
    return p;
}
void propagate(ll x,ll y,ll z)
{
    if(z<1048576)
    {
        lazy[z*2]+=lazy[z];
        lazy[z*2+1]+=lazy[z];
    }
    seg[z]+=lazy[z];
    lazy[z]=0;
}
void f(ll x,ll y,ll z,ll w)
{
    propagate(x,y,z);
    if(y<l||x>r)
        return;
    if(l<=x&&y<=r)
    {
        lazy[z]+=w;
        propagate(x,y,z);
        return;
    }
    f(x,(x+y)/2,z*2,w);
    f((x+y)/2+1,y,z*2+1,w);
    seg[z]=max(seg[z*2],seg[z*2+1]);
}
ll g(ll x,ll y,ll z)
{
    propagate(x,y,z);
    if(y<l||x>r)
    {
        return -inf;
    }
    if(l<=x&&y<=r)
    {
        return seg[z];
    }
    return max(g(x,(x+y)/2,z*2),g((x+y)/2+1,y,z*2+1));
}
void add(ll x,ll y,ll z)
{
    l=x+1;
    r=y+1;
    f(1,1048576,1,z);
}
ll get_val(ll x)
{
    l=x+1;
    r=x+1;
    return g(1,1048576,1);
}
void reconstruct_chain(ll x)
{
    pair<ll,ll> p=find_chain(x);
    while(chain.upper_bound(p)!=chain.end())
    {
        pair<ll,ll> q=(*chain.upper_bound(p));
        y=get_val(p.second);
        z=get_val(q.first);
        //printf("(%lld,%lld,%lld,%lld)\n",p.first,p.second,q.first,q.second);
        if(z<=y+cost[p.second])
        {
            add(q.first,q.second,y+cost[p.second]-z);
            chain.erase(p);
            chain.erase(q);
            chain.insert({p.first,q.second});
            p.second=q.second;
        }
        else
            return;
    }
}
void show()
{
    return;
    ll i;
    for(i=0;i<=m;i++)
        printf("%lld ",get_val(i));
    printf("\n");
}
int main()
{
    scanf("%lld %lld",&n,&m);
    for(i=1;i<=n;i++)
    {
        scanf("%lld %lld %lld",&a[i],&c[i],&add_cost[i]);
        sum1[i]=sum1[i-1]+a[i];
    }
    for(i=1;i<=m;i++)
    {
        scanf("%lld %lld %lld",&b[i],&d[i],&cost[i-1]);
        sum2[i]=sum2[i-1]+b[i];
    }
    for(i=1;i<=n;i++)
    {
        range[i]=upper_bound(sum2,sum2+m+1,c[i]-sum1[i])-sum2-1;
        //printf("(%lld) ",range[i]);
    }
    //printf("\n");
    for(i=1;i<=m;i++)
    {
        x=upper_bound(sum1,sum1+n+1,d[i]-sum2[i])-sum1;
        del_list[x].push_back(i-1);
        //printf("(%lld)",x);
    }
    //printf("\n");
    for(auto xx:del_list[0])
    {
        cost[xx]=0;
    }
    for(i=1;i<=m;i++)
    {
        dp[i]=dp[i-1]+cost[i-1];
    }
    for(i=0;i<=m;i++)
    {
        add(i,i,dp[i]);
    }
    /*for(i=0;i<=m;i++)
    {
        printf("(%lld)",cost[i]);
    }
    printf("\n");
    */chain.insert({0,m});
    for(i=1;i<=n;i++)
    {show();
    if(add_cost[i]>=0)
        for(auto xx:del_list[i])
        {
            //printf("{%lld}\n",xx);
            if(cost[xx]>0)
            {
                p=find_chain(xx);
            chain.erase(p);
            chain.insert({p.first,xx});
            if(xx+1<=p.second)
            chain.insert({xx+1,p.second});
            cost[xx]=0;
            }
            else
            {
                p=find_chain(xx);
                add(xx+1,p.second,-cost[xx]);
                cost[xx]=0;
            reconstruct_chain(xx);
            }
        }
        x=range[i];
        p=find_chain(x);
        if(x==-1)
            continue;
        if(add_cost[i]>0)
        {
            add(0,p.second,add_cost[i]);
            //printf("[%lld,%lld]\n",x,cost[x]);
        reconstruct_chain(x);
        }
        else
        {
            chain.erase(p);
            chain.insert({p.first,x});
            if(x+1<=p.second)
            chain.insert({x+1,p.second});
            add(0,x,add_cost[i]);
            reconstruct_chain(x);
        }
        if(add_cost[i]<0)
        for(auto xx:del_list[i])
        {
            //printf("{%lld}\n",xx);
            if(cost[xx]>0)
            {
                p=find_chain(xx);
            chain.erase(p);
            chain.insert({p.first,xx});
            if(xx+1<=p.second)
            chain.insert({xx+1,p.second});
            cost[xx]=0;
            }
            else
            {
                p=find_chain(xx);
                add(xx+1,p.second,-cost[xx]);
                cost[xx]=0;
            reconstruct_chain(xx);
            }
        }
    }
    s=-inf;
    show();
    for(i=m;i<=m;i++)
    {
        s=max(s,get_val(i));
    }
    printf("%lld",s);
}

Compilation message (stderr)

dishes.cpp: In function 'int main()':
dishes.cpp:140:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  140 |     if(add_cost[i]>=0)
      |     ^~
dishes.cpp:161:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  161 |         x=range[i];
      |         ^
dishes.cpp:96:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   96 |     scanf("%lld %lld",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
dishes.cpp:99:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   99 |         scanf("%lld %lld %lld",&a[i],&c[i],&add_cost[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dishes.cpp:104:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  104 |         scanf("%lld %lld %lld",&b[i],&d[i],&cost[i-1]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 3 / 3
• Subtask 3: 7 / 7
• Subtask 4: 39 / 39
• Subtask 5: 11 / 11
• Subtask 6: 9 / 9
• Subtask 7: 0 / 17
• Subtask 8: 0 / 9