oj.uz

Submission #978670

# Submission time Handle Problem Language Result Execution time Memory
978670 2024-05-09T13:10:49 Z nnin Palembang Bridges (APIO15_bridge) C++17
22 / 100
 34 ms 4816 KB 
#include<bits/stdc++.h>
using namespace std;
#define pii pair<int,int>
using ll = long long;
#define f first
#define s second
 
vector<pii> cross;
int N, K;
 
ll check1(int bridge) {
    ll ret = 0;
    for(auto [st, en]:cross) {
        if(bridge<st) ret += (ll)st-bridge+en-bridge;
        else if(bridge>en) ret += (ll)bridge-st+bridge-en;
        else ret += (ll)en-st;
    }
    return ret;
}
 
ll one() {
    vector<int> v;
    for(auto [st, en]:cross) {
        v.push_back(st);
        v.push_back(en);
    }
    sort(v.begin(), v.end());
    return min(check1(v[((int)v.size()-1)/2]), check1(v[(int)v.size()/2]));
}

ll val1[100005], val2[100005], suml, sumr;
priority_queue<int> l;
priority_queue<int, vector<int>, greater<int>> r;

void insert(int x) {
    if(l.empty() || x<=l.top()) l.push(x), suml += x;
    else r.push(x), sumr += x;
    if(l.size()>r.size()+1) {
        sumr += l.top();
        suml -= l.top();
        r.push(l.top());
        l.pop();
    }
    if(r.size()>l.size()) {
        suml += r.top();
        sumr -= r.top();
        l.push(r.top());
        r.pop();
    }
}
 
ll two() {
    sort(cross.begin(), cross.end());
    for(int i=0;i<cross.size()-1;i++) {
        insert(cross[i].f); insert(cross[i].s);
        val1[i] = sumr-suml;
    }
    while(!l.empty()) l.pop();
    while(!r.empty()) r.pop();
    suml = sumr = 0;
    for(int i=cross.size()-2;i>=0;i--) {
        insert(cross[i+1].f); insert(cross[i+1].s);
        val2[i] = sumr-suml;
    }
    ll ret = one();
    for(int i=0;i<cross.size()-1;i++) {
        ret = min(ret, val1[i]+val2[i]);
    }
    return ret;
}
 
int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    cin>>K>>N;
    ll ans = 0;
    for(int i=0;i<N;i++) {
        char z1, z2;
        int b1, b2;
        cin>>z1>>b1>>z2>>b2;
        if(b1>b2) swap(b1, b2);
        if(z1==z2) {
            ans += b2-b1;
        } else {
            cross.push_back({b1, b2});
        }
    }
    if(cross.empty()) {
        cout<<ans;
        return 0;
    }
    ans += cross.size();
    if(K==1) cout<<ans+one();
    else cout<<ans+two();
}

Compilation message

bridge.cpp: In function 'll two()':
bridge.cpp:54:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     for(int i=0;i<cross.size()-1;i++) {
      |                 ~^~~~~~~~~~~~~~~
bridge.cpp:66:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |     for(int i=0;i<cross.size()-1;i++) {
      |                 ~^~~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct

Subtask #2
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 496 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 16 ms 3504 KB Output is correct
13 Correct 34 ms 4808 KB Output is correct
14 Correct 25 ms 3796 KB Output is correct
15 Correct 19 ms 2768 KB Output is correct
16 Correct 20 ms 4308 KB Output is correct
17 Correct 22 ms 4816 KB Output is correct
18 Correct 26 ms 4568 KB Output is correct
19 Correct 32 ms 4708 KB Output is correct
20 Correct 22 ms 4556 KB Output is correct
21 Correct 29 ms 4564 KB Output is correct

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Incorrect 1 ms 348 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 600 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Incorrect 0 ms 348 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #5
0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Incorrect 0 ms 348 KB Output isn't correct
5 Halted 0 ms 0 KB -