Submission #41404

#	Time	Username	Problem	Language	Result	Execution time	Memory
41404		Nurlykhan	Palembang Bridges (APIO15_bridge)	C++14	22 / 100	95 ms	1560 KiB

bridge

#include <bits/stdc++.h>

#define pii pair<int, int>
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define ll long long
#define ld long double
#define sz(v) int(v.size())
#define all(v) v.begin(), v.end()
#define vec vector<int>
#define dead not_bad
#define bad gooood

#define left not_right
#define y1 what

using namespace std;

const int N = (int) 2e5 + 10;
const int M = (int) 2e6;
const ll LINF = (ll) 2e18;
const int INF = (int) 1e9 + 7;
const int ALPHA = 26;
const int mod = INF;
const double PI = 3.14159265359;
const ld EPS = (ld) 1e-12;

const int nx[4] = {0, 0, -1, 1};
const int ny[4] = {1, -1, 0, 0};

vector<int> a, b;
int k, n;

inline ll get1(int x1, int x2) {
    ll cur = 0;
    for (int i = 0; i < sz(a); i++) {
      int val1, val2;
      if (a[i] <= x1 && x1 <= b[i]) {
        val1 = b[i] - a[i];
      } else if (a[i] > x1) {
        val1 = a[i] + b[i] - 2 * x1;
      } else {
        val1 = 2 * x1 - (a[i] + b[i]);
      }
      if (a[i] <= x2 && x2 <= b[i]) {
        val2 = b[i] - a[i];
      } else if (a[i] > x2) {
        val2 = a[i] + b[i] - 2 * x2;
      } else {
        val2 = 2 * x2 - (a[i] + b[i]);
      }
      cur += min(val1, val2);
    }
    return cur;
}

ll get(ll x) {
  ll cur = 0;
    for (int i = 0; i < sz(a); i++) {
      if (a[i] <= x && x <= b[i]) {
        cur += b[i] - a[i];
      } else if (a[i] > x) {
        cur += a[i] + b[i] - 2 * x;
      } else if (b[i] < x) {
        cur += 2 * x - (a[i] + b[i]);
      } else {
        assert(0);
      }
    }
    if (k == 2) {
  int l = 0, r = INF;
  while (r - l > 2) {
    int m = (l + r) / 2;
    if (get1(m, x) > get1(m + 1, x)) {
      l = m;
    } else {
      r = m;
    }
  }
      for (ll i = l; i <= r; i++) 
        cur = min(cur, get1(i, x));
    }
    return cur;
}

ll solve() {
  int l = 0, r = INF;
  while (r - l > 2) {
    int m = (l + r) / 2;
    if (get(m) > get(m + 1)) {
      l = m;
    } else {
      r = m;
    }
  }
  ll ans = LINF;
  for (ll i = l; i <= r; i++) {
    ans = min(ans, get(i));
  }
  return ans + sz(a);
}

int main() {
  #define fn "teams"
  #ifdef witch
      freopen("input.txt", "r", stdin);
      freopen("output.txt", "w", stdout);
  #else
      //freopen(fn".in", "r", stdin);
      //freopen(fn".out", "w", stdout);
  #endif  
  ll ans = 0;
  cin >> k >> n;
  for (int i = 1; i <= n; i++) {
    char ta, tb;
    int x1, x2;
    scanf("\n%c %d %c %d", &ta, &x1, &tb, &x2);
    //cout << ta << ' ' << x1 << ' ' << tb << ' ' << x2 << endl;
    if (x1 > x2) 
      swap(x1, x2);
    if (ta == tb) {
      ans += x2 - x1;
    } else {
      a.pb(x1);
      b.pb(x2);
    }
  }
  cout << ans + solve();
  return 0;
}

Compilation message (stderr)

bridge.cpp: In function 'int main()':
bridge.cpp:119:47: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("\n%c %d %c %d", &ta, &x1, &tb, &x2);
                                               ^

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