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답안 #409372

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
409372 2021-05-20T15:47:59 Z Hazem Building Bridges (CEOI17_building) C++14
100 / 100
 90 ms 66472 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define LL long long
#define F first
#define S second
#define pii pair<int,int>
#define piii pair<pair<int,int>,int>

const int N = 4e6+10;
const int M = 2e5+10;
const LL INF = 1e12;
const LL LINF = 2e18;
const LL MOD = 1e9+7;
const double PI = 3.141592653589793;

struct Line{

    LL a ,b;
    LL get_val(LL x){return a*x+b;}
    Line(){
        a = -INF;
        b = -LINF;
    }

    Line(LL a1,LL b1){
        a = a1;
        b = b1;
    }
};

struct node{

    node *l,*r;
    Line line;

    node(Line L):line(L),l(NULL),r(NULL){};
};

LL a[M],pr[M],dp[M];
Line tree[N];

void update(int v,int tl,int tr,Line l){

    int mid = (tl+tr)/2;
    bool L = tree[v].get_val(tl) > l.get_val(tl);
    bool R = tree[v].get_val(tr) > l.get_val(tr);
    bool M = tree[v].get_val(mid) > l.get_val(mid);

    if(L==R){
        if(!L)swap(l,tree[v]);
        return ;
    }

    if(M==R){
        if(!R)swap(tree[v],l);
        update(v*2,tl,mid,l);
    }
    else {
        if(!L)swap(tree[v],l);
        update(v*2+1,mid+1,tr,l);
    }
    return ;
}

LL get(int v,int tl,int tr,int pos){

    if(tl==tr)
        return tree[v].get_val(pos);
    
    int mid = (tl+tr)/2;
    if(pos<=mid)    
        return max(tree[v].get_val(pos),get(v*2,tl,mid,pos));
    else 
        return max(tree[v].get_val(pos),get(v*2+1,mid+1,tr,pos));
}

int main(){

    //freopen("out.txt","w",stdout);

    int n;
    scanf("%d",&n);

    for(int i=1;i<=n;i++)
        scanf("%lld",&a[i]);

    for(int i=1;i<=n;i++)
        scanf("%lld",&pr[i]),pr[i] += pr[i-1];

    Line l = Line(2*a[1],+pr[1]-a[1]*a[1]);
    update(1,0,1e6,l);
    for(int i=2;i<=n;i++){
        dp[i] = a[i]*a[i]+pr[i-1]-get(1,0,1e6,a[i]);
        l = Line(2*a[i],+pr[i]-a[i]*a[i]-dp[i]);
        update(1,0,1e6,l);
    }

    printf("%lld\n",dp[n]);
}

Compilation message

building.cpp: In constructor 'node::node(Line)':
building.cpp:35:10: warning: 'node::line' will be initialized after [-Wreorder]
   35 |     Line line;
      |          ^~~~
building.cpp:34:11: warning:   'node* node::l' [-Wreorder]
   34 |     node *l,*r;
      |           ^
building.cpp:37:5: warning:   when initialized here [-Wreorder]
   37 |     node(Line L):line(L),l(NULL),r(NULL){};
      |     ^~~~
building.cpp: In function 'int main()':
building.cpp:83:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
building.cpp:86:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   86 |         scanf("%lld",&a[i]);
      |         ~~~~~^~~~~~~~~~~~~~
building.cpp:89:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |         scanf("%lld",&pr[i]),pr[i] += pr[i-1];
      |         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 30 ms 62796 KB Output is correct
2 Correct 30 ms 62860 KB Output is correct
3 Correct 29 ms 62916 KB Output is correct
4 Correct 34 ms 62952 KB Output is correct
5 Correct 30 ms 62924 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 84 ms 65904 KB Output is correct
2 Correct 85 ms 66252 KB Output is correct
3 Correct 86 ms 66236 KB Output is correct
4 Correct 82 ms 66116 KB Output is correct
5 Correct 77 ms 66080 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 30 ms 62796 KB Output is correct
2 Correct 30 ms 62860 KB Output is correct
3 Correct 29 ms 62916 KB Output is correct
4 Correct 34 ms 62952 KB Output is correct
5 Correct 30 ms 62924 KB Output is correct
6 Correct 84 ms 65904 KB Output is correct
7 Correct 85 ms 66252 KB Output is correct
8 Correct 86 ms 66236 KB Output is correct
9 Correct 82 ms 66116 KB Output is correct
10 Correct 77 ms 66080 KB Output is correct
11 Correct 90 ms 66472 KB Output is correct
12 Correct 90 ms 66244 KB Output is correct
13 Correct 75 ms 66332 KB Output is correct
14 Correct 90 ms 66436 KB Output is correct
15 Correct 81 ms 66068 KB Output is correct
16 Correct 75 ms 66136 KB Output is correct
17 Correct 64 ms 66244 KB Output is correct
18 Correct 60 ms 66296 KB Output is correct