Submission #549987

#	Time	Username	Problem	Language	Result	Execution time	Memory
549987		CyberSleeper	Palembang Bridges (APIO15_bridge)	C++14	22 / 100	44 ms	3564 KiB

bridge

#include <bits/stdc++.h>
#define fastio      ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define debug(x)    cout << "Line " << __LINE__ << ", " << #x << " is " << x << endl
#define all(x)      x.begin(), x.end()
#define fi          first
#define se          second
#define mp          make_pair
#define pb          push_back
#define ll          long long
#define ull         unsigned long long
#define pll         pair<ll, ll>
#define pii         pair<int, int>
#define ld          long double
#define nl          endl
#define tb          '\t'
#define sp          ' '
#define sqr(x)      (x)*(x)
#define arr3        array<int, 3>
using namespace std;
 
const int MX=30005, MOD=1000000007, BLOCK=160, INF=2e9+7, LG=62;
const ll INFF=1000000000000000007;
const ld ERR=1e-6, pi=3.14159265358979323846;
 
ll N, K, ans, sum;
vector<int> A, B;
 
int main(){
    fastio;
    cin >> K >> N;
    for(int i=0; i<N; i++){
        char a, c;
        int b, d;
        cin >> a >> b >> c >> d;
        if(a==c){
            ans+=abs(b-d);
        }else{
            ans++;
            if(a=='B')
                swap(b, d);
            A.pb(b);
            B.pb(d);
            sum+=b+d;
        }
    }
    sort(all(A));
    sort(all(B));
    ll loc=0, ptrA=0, ptrB=0, best=sum;
    N=A.size();
    while(ptrA<A.size() && ptrB<B.size()){
        ll dist;
        if(A[ptrA]<=B[ptrB]){
            dist=A[ptrA]-loc;
            sum=sum+dist*(ptrA+ptrB)-dist*(N-ptrA+N-ptrB);
            loc=A[ptrA];
            ptrA++;
        }else{
            dist=B[ptrB]-loc;
            sum=sum+dist*(ptrA+ptrB)-dist*(N-ptrA+N-ptrB);
            loc=B[ptrB];
            ptrB++;
        }
        best=min(best, sum);
    }
    while(ptrA<A.size()){
        ll dist=A[ptrA]-loc;
        sum=sum+dist*(ptrA+ptrB)-dist*(N-ptrA+N-ptrB);
        loc=A[ptrA];
        ptrA++;
    }
    while(ptrB<B.size()){
        ll dist=B[ptrB]-loc;
        sum=sum+dist*(ptrB+ptrB)-dist*(N-ptrB+N-ptrB);
        loc=B[ptrB];
        ptrB++;
    }
    cout << ans+best << nl;
}

Compilation message (stderr)

bridge.cpp: In function 'int main()':
bridge.cpp:50:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |     while(ptrA<A.size() && ptrB<B.size()){
      |           ~~~~^~~~~~~~~
bridge.cpp:50:32: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |     while(ptrA<A.size() && ptrB<B.size()){
      |                            ~~~~^~~~~~~~~
bridge.cpp:65:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |     while(ptrA<A.size()){
      |           ~~~~^~~~~~~~~
bridge.cpp:71:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |     while(ptrB<B.size()){
      |           ~~~~^~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 0 / 9
• Subtask 4: 0 / 32
• Subtask 5: 0 / 37