Submission #41461

#	Time	Username	Problem	Language	Result	Execution time	Memory
41461		fest	Palembang Bridges (APIO15_bridge)	C++14	22 / 100	79 ms	1764 KiB

bridge

// fest
#include <bits/stdc++.h>	

#define pb push_back
#define F first
#define S second
#define y1 dasdasfasfas
#define x1 wqdadfasfasfas
#define All(c) c.begin(), c.end()
#define SZ(A) (int((A).size()))
#define umap unordered_map
#define FILENAME ""
#define __ fflush(stdout)

typedef long long ll;
typedef long double ld;    

using namespace std;

void FREOPEN() {
	#ifdef COMP
		freopen(".in", "r", stdin);
		freopen("2.out", "w", stdout);
	#else
		freopen(FILENAME".in", "r", stdin);
		freopen(FILENAME".out", "w", stdout);
	#endif
}                           

inline double Time() {return (clock() * 1.0) / CLOCKS_PER_SEC; }             

const int N = 200500, inf = 1e9 + 1, MOD = (int)1e9 + 7;

char CH[N];

const ll INF = 1e18;

const int dx[] = {1, -1, 0, 0, -1, 1, -1, 1};
const int dy[] = {0, 0, 1, -1, -1, 1, 1, -1};

vector<pair<int, int> > all;

ll calc(int p, int l, int r) {
	ll ret = 0;
	for (int i = l; i < r; i++) {
		ret += abs(all[i].F - p) + abs(all[i].S - p);
	}	
	return ret;
}

ll check(int lef, int rig) {
	int l = 0;
	int r = inf;
	while (r - l > 1) {
		int mid = (l + r) / 2;
		if (calc(mid, lef, rig) > calc(mid + 1, lef, rig)) l = mid;
		else r = mid;
	}
	return min(calc(l, lef, rig), calc(r, lef, rig));
}

int main() {
  
	int k, n;
	cin >> k >> n;
	ll un = 0;
	for (int i = 1; i <= n; i++) {
		char t1, t2;
		int p1, p2;
		scanf("\n%c %d %c %d", &t1, &p1, &t2, &p2);
		if (t2 == 'A') swap(t1, t2), swap(p1, p2);
		if (t1 == t2) {
			un += abs(p2 - p1);
			continue;
		}
		all.pb({p1, p2});
	}
	un += SZ(all);
	sort(All(all));
	ll ans = check(0, SZ(all));
	if (k == 1) {
		cout << ans + un;
		return 0;
	}
	sort(All(all));
	for (int mid = 0; mid < SZ(all); mid++) {
		ans = min(ans, check(0, mid) + check(mid, SZ(all)));	
	}
	cout << ans + un;
	return 0;	
}

Compilation message (stderr)

bridge.cpp: In function 'void FREOPEN()':
bridge.cpp:25:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(FILENAME".in", "r", stdin);
                                     ^
bridge.cpp:26:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(FILENAME".out", "w", stdout);
                                       ^
bridge.cpp: In function 'int main()':
bridge.cpp:70:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("\n%c %d %c %d", &t1, &p1, &t2, &p2);
                                             ^

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