Submission #1177322

#	Time	Username	Problem	Language	Result	Execution time	Memory
1177322		ElayV13	Palembang Bridges (APIO15_bridge)	C++20	0 / 100	1 ms	328 KiB

bridge

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ld long double
#define FOR(a , b) for(int i = a;i <= b;i++)
#define pb push_back
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int MXN = 100005;
const int INF = 1e18;
const int mod = 1e9 + 7;

int k , n , s[MXN] , t[MXN];
char p[MXN] , q[MXN];

int calc(int pa , int pb)
{
        int res = 0;
        for(int i = 1;i <= n;i++)
        {
                if(p[i] == q[i])
                {
                        res += (abs(s[i] - t[i]));
                        continue;
                }
                ++res;
                res += min((abs(s[i] - pa)) + (abs(t[i] - pa)) , (abs(s[i] - pb)) + (abs(t[i] - pb)));
        }
        return res;
}

signed main(){
      ios_base::sync_with_stdio(0);
      cin.tie(0);cout.tie(0);
      cin >> k >> n;
      vector < int > pos; map < int , int > used;
      for(int i = 1;i <= n;i++)
      {
              cin >> p[i] >> s[i] >> q[i] >> t[i];
              if(!used[s[i]]){
                        pos.push_back(s[i]);
                        used[s[i]] = 1;
              }
              if(!used[t[i]]){
                        pos.push_back(t[i]);
                        used[t[i]] = 1;
              }
      }
      int res = INF;
      for(int i = 0;i < pos.size();i++)
      {
              int l = 1 , r = i , mn = i;
              while(l <= r){
                        int mid = (l + r) >> 1;
                        if(calc(pos[i] , pos[mid]) < calc(pos[i] , pos[mid - 1])){
                                mn = min(mn , mid); r = mid - 1;
                        }
                        else l = mid + 1;
              }
              res = min(res , calc(pos[i] , pos[mn]));
              l = i , r = pos.size() - 2;
              int mx = 0;
              while(l <= r){
                        int mid = (l + r) >> 1;
                        if(calc(pos[i] , pos[mid]) < calc(pos[i] , pos[mid + 1])){
                                mx = max(mx , mid); l = mid + 1;
                        }
                        else r = mid - 1;
              }
              res = min(res , calc(pos[i] , pos[mx]));
      }
      cout << res << endl;
}

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