oj.uz

Submission #270178

# Submission time Handle Problem Language Result Execution time Memory
270178 2020-08-17T12:59:08 Z MarcoMeijer Building Bridges (CEOI17_building) C++14
30 / 100
 356 ms 1400 KB 
#include <bits/stdc++.h>
using namespace std;

// macros
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> lll;
typedef tuple<int, int, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<iii> viii;
typedef vector<ll> vll;
typedef vector<lll> vlll;
#define REP(a,b,c) for(int a=int(b); a<int(c); a++)
#define RE(a,c) REP(a,0,c)
#define RE1(a,c) REP(a,1,c+1)
#define REI(a,b,c) REP(a,b,c+1)
#define REV(a,b,c) for(int a=int(c-1); a>=int(b); a--)
#define FOR(a,b) for(auto& a : b)
#define all(a) a.begin(), a.end()
#define INF 1e18
#define EPS 1e-9
#define pb push_back
#define popb pop_back
#define fi first
#define se second
#define sz size()
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

// input
template<class T> void IN(T& x) {cin >> x;}
template<class H, class... T> void IN(H& h, T&... t) {IN(h); IN(t...); }

// output
template<class T1, class T2> void OUT(const pair<T1,T2>& x);
template<class T> void OUT(const T& x) {cout << x;}
template<class H, class... T> void OUT(const H& h, const T&... t) {OUT(h); OUT(t...); }
template<class T1, class T2> void OUT(const pair<T1,T2>& x) {OUT(x.fi,' ',x.se);}
template<class... T> void OUTL(const T&... t) {OUT(t..., "\n"); }
template<class H> void OUTLS(const H& h) {OUTL(h); }
template<class H, class... T> void OUTLS(const H& h, const T&... t) {OUT(h,' '); OUTLS(t...); }

//===================//
//  Added libraries  //
//===================//

//===================//
//end added libraries//
//===================//

void program();
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    program();
}


//===================//
//   begin program   //
//===================//

const int MX = 1e6+10;

int n;
int h[MX], w[MX];

ll dp[MX];

ll SQ(ll x) {return x*x;}

void program() {
    IN(n);
    RE(i,n) IN(h[i]);
    RE(i,n) IN(w[i]);

    ll totW = 0;
    RE(i,n) totW += w[i];

    if(n <= 1000) {
        dp[0] = -w[0];
        REP(i,1,n) {
            dp[i] = INF;
            REP(j,0,i) dp[i] = min(dp[i], dp[j] + SQ(h[i]-h[j]) - w[i]);
        }

        ll ans = dp[n-1] + totW;
        OUTL(ans);
        return;
    }

    ll ans = INF;
    REI(W,-20,20) {
        set<int> s;
        REP(i,1,n) {
            int mid = (h[0]+h[i])/2;
            ans = min(ans, SQ(h[i]-h[n-1]) + SQ(h[i]-h[0]) - w[i] + totW);

            auto it = s.lower_bound(h[i]);
            if(it != s.end()) {
                ans = min(ans, SQ(h[0]-*it) + SQ(*it-h[i]) + SQ(h[i]-h[n-1]) - w[i] - W + totW);
            }
            it = s.upper_bound(h[i]);
            if(it != s.begin()) {
                it--;
                ans = min(ans, SQ(h[0]-*it) + SQ(*it-h[i]) + SQ(h[i]-h[n-1]) - w[i] - W + totW);
            }

            if(w[i] == W) s.insert(h[i]);
        }
    }
}

Compilation message

building.cpp: In function 'void program()':
building.cpp:98:17: warning: unused variable 'mid' [-Wunused-variable]
   98 |             int mid = (h[0]+h[i])/2;
      |                 ^~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 356 ms 1400 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Incorrect 356 ms 1400 KB Output isn't correct
7 Halted 0 ms 0 KB -