oj.uz

Submission #469392

# Submission time Handle Problem Language Result Execution time Memory
469392 2021-08-31T18:32:11 Z denkendoemeer Building Bridges (CEOI17_building) C++14
100 / 100
 111 ms 9668 KB 
#include<bits/stdc++.h>
#define ll long long
using namespace std;
struct line
{
    int tip;
    double x;
    ll s,y;
};
bool operator < (const line &a,const line &b)
{
    if (a.tip+b.tip>0)
        return a.x<b.x;
    return a.s>b.s;
}
set<line>st;
typedef set<line>::iterator sti;
bool hasp(sti it)
{
    return it!=st.begin();
}
bool hasn(sti it)
{
    return it!=st.end() && next(it)!=st.end();
}
double inter(const sti a,const sti b)
{
    return (double)(a->y-b->y)/(b->s-a->s);
}
void calcx(sti it)
{
    if (hasp(it)){
        line aux=*it;
        aux.x=inter(prev(it),it);
        st.insert(st.erase(it),aux);
    }
}
bool rem(sti it)
{
    if (hasp(it) && hasn(it) && inter(it,next(it))<=inter(prev(it),next(it)))
        return 1;
    return 0;
}
void add(ll s,ll y)
{
    sti it=st.lower_bound((line){0,0,s,y});
    if (it!=st.end() && it->s==s){
        if (it->y<=y)
            return ;
        st.erase(it);
    }
    it=st.insert((line){0,0,s,y}).first;
    if (rem(it)){
        st.erase(it);
        return ;
    }
    while(hasp(it) && rem(prev(it)))
        st.erase(prev(it));
    while(hasn(it) && rem(next(it)))
        st.erase(next(it));
    if (hasn(it))
        calcx(next(it));
    calcx(it);
}
ll query(ll x)
{
    auto it=st.upper_bound((line){1,(double)x,0,0});
    it--;
    return it->s*x+it->y;
}
ll h[100005],w[100005];
int main()
{
    //freopen(".in","r",stdin);
    //freopen(".out","w",stdout);
    int n,i;
    ll cur,s=0;
    scanf("%d",&n);
    for(i=1;i<=n;i++)
        scanf("%lld",&h[i]);
    for(i=1;i<=n;i++)
        scanf("%lld",&w[i]);
    s+=w[1];
    add(-2*h[1],h[1]*h[1]-w[1]);
    for(i=2;i<=n;i++){
        cur=query(h[i])+h[i]*h[i]-w[i];
        s+=w[i];
        add(-2*h[i],cur+h[i]*h[i]);
    }
    printf("%lld\n",s+cur);
return 0;
}

Compilation message

building.cpp: In function 'int main()':
building.cpp:78:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
building.cpp:80:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         scanf("%lld",&h[i]);
      |         ~~~~~^~~~~~~~~~~~~~
building.cpp:82:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         scanf("%lld",&w[i]);
      |         ~~~~~^~~~~~~~~~~~~~
building.cpp:90:11: warning: 'cur' may be used uninitialized in this function [-Wmaybe-uninitialized]
   90 |     printf("%lld\n",s+cur);
      |     ~~~~~~^~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 84 ms 1880 KB Output is correct
2 Correct 84 ms 1876 KB Output is correct
3 Correct 85 ms 2000 KB Output is correct
4 Correct 82 ms 1816 KB Output is correct
5 Correct 85 ms 3356 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 84 ms 1880 KB Output is correct
7 Correct 84 ms 1876 KB Output is correct
8 Correct 85 ms 2000 KB Output is correct
9 Correct 82 ms 1816 KB Output is correct
10 Correct 85 ms 3356 KB Output is correct
11 Correct 77 ms 1836 KB Output is correct
12 Correct 85 ms 1868 KB Output is correct
13 Correct 58 ms 1804 KB Output is correct
14 Correct 82 ms 1896 KB Output is correct
15 Correct 111 ms 9668 KB Output is correct
16 Correct 84 ms 3396 KB Output is correct
17 Correct 24 ms 1768 KB Output is correct
18 Correct 24 ms 1732 KB Output is correct