Submission #297645

#	Time	Username	Problem	Language	Result	Execution time	Memory
297645		AaronNaidu	Palembang Bridges (APIO15_bridge)	C++14	22 / 100	54 ms	6388 KiB

bridge

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll k, n;
ll s, t, numLeft, numRight, distFrom0;
ll minSum;
char p, q;
vector<pair<ll, ll> > events, eventss;

ll solveProblem() {
   // cout << "Solving problem:\n";
    sort(events.begin(), events.end());
    ll prevLocation = 0;
    ll finAns = 1000000000000000;
    if (events.size() == 0)
    {
        finAns = minSum;
    }
  //  cout << "Entering for loop\n";
    for (int i = 0; i < events.size(); i++)
    {
        ll currLocation = events[i].first;
        distFrom0 -= numRight * (currLocation - prevLocation);
        distFrom0 += numLeft * (currLocation - prevLocation);
        if (events[i].second == -1)
        {
            numRight--;
        }
        else
        {
            numLeft++;
        }
        finAns = min(finAns, minSum + 2 * distFrom0);
        //cout << "At location " << currLocation << " dist is " << distFrom0 << '\n'; 
        prevLocation = currLocation;
    }
    //cout << "Solved problem\n";
    return finAns;
}


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin >> k >> n;
    minSum = 0;
    numLeft = numRight = distFrom0 = 0;
    if (k == 1)
    {
        for (int i = 0; i < n; i++)
        {
            cin >> p >> s >> q >> t;
            if (p == q)
            {
                minSum += abs(t - s);
            }
            else
            {
                minSum += 1 + abs(t - s);
                ll b = max(t, s);
                ll a = min(t, s);
                events.push_back({a, -1});
                events.push_back({b, 1});
                numRight++;
                distFrom0 += a;
            }
        }
        //cout << "Min sum is " << minSum << "\n";
        //cout << "Initial dist: " << distFrom0 << "\n";
        sort(events.begin(), events.end());
        ll prevLocation = 0;
        ll finAns = 1000000000000000;
        if (events.size() == 0)
        {
            finAns = minSum;
        }
        for (int i = 0; i < events.size(); i++)
        {
            ll currLocation = events[i].first;
            distFrom0 -= numRight * (currLocation - prevLocation);
            distFrom0 += numLeft * (currLocation - prevLocation);
            if (events[i].second == -1)
            {
                numRight--;
            }
            else
            {
                numLeft++;
            }
            finAns = min(finAns, minSum + 2 * distFrom0);
            //cout << "At location " << currLocation << " dist is " << distFrom0 << '\n'; 
            prevLocation = currLocation;
        }
        cout << finAns << "\n";
        return 0;
    }
    for (int i = 0; i < n; i++)
    {
        //cout << "This i = " << i << "\n";
        cin >> p >> s >> q >> t;
        if (p == q)
        {
            minSum += abs(t - s);
        }
        else
        {
            minSum += 1 + abs(t - s);
            ll b = max(t, s);
            ll a = min(t, s);
            eventss.push_back({a, b});
        }
    }
    //cout << "Checking size\n";
    if(eventss.size() < 2) {
        cout << minSum << "\n";
        return 0;
    }
    ll finAns = 1000000000000000;
    //cout << "Eventss size: " << eventss.size() << "\n";
    for (int i = 0; i < eventss.size(); i++)
    {
       // cout << "i = " << i << "\n";
        distFrom0 = numLeft = numRight = 0;
        events.clear();
        for (int j = 0; j < eventss.size(); j++)
        {
           // cout << "j1 = " << j << "\n";
            if (eventss[j].second < eventss[i].first or eventss[j].first > eventss[i].first)
            {
                //cout << "In if\n";
                events.push_back({eventss[j].first, -1});
                events.push_back({eventss[j].second, 1});
                distFrom0 += eventss[j].first;
                numRight++;
            }
        }
        finAns = min(finAns, solveProblem());
        distFrom0 = numLeft = numRight = 0;
        events.clear();
        for (int j = 0; j < eventss.size(); j++)
        {
            if (eventss[j].second < eventss[i].second or eventss[j].first > eventss[i].second)
            {
                events.push_back({eventss[j].first, -1});
                events.push_back({eventss[j].second, 1});
                distFrom0 += eventss[j].first;
                numRight++;
            }
        }
        finAns = min(finAns, solveProblem());
    }
    cout << finAns << "\n";    
}

Compilation message (stderr)

bridge.cpp: In function 'll solveProblem()':
bridge.cpp:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for (int i = 0; i < events.size(); i++)
      |                     ~~^~~~~~~~~~~~~~~
bridge.cpp: In function 'int main()':
bridge.cpp:79:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |         for (int i = 0; i < events.size(); i++)
      |                         ~~^~~~~~~~~~~~~~~
bridge.cpp:122:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  122 |     for (int i = 0; i < eventss.size(); i++)
      |                     ~~^~~~~~~~~~~~~~~~
bridge.cpp:127:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  127 |         for (int j = 0; j < eventss.size(); j++)
      |                         ~~^~~~~~~~~~~~~~~~
bridge.cpp:142:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  142 |         for (int j = 0; j < eventss.size(); j++)
      |                         ~~^~~~~~~~~~~~~~~~

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