Submission #43460

#	Time	Username	Problem	Language	Result	Execution time	Memory
43460		duiceman	Palembang Bridges (APIO15_bridge)	C++14	0 / 100	4 ms	3656 KiB

bridge

#include <bits/stdc++.h>
 
using namespace std;
 
#define x first
#define y second
#define umap unordered_map
#define pqueue priority_queue
#define mset multiset
#define mp make_pair
#define mt make_tuple
#define all(x) x.begin(),x.end()
#define long long long
#define MOD 1000000007
#define MAX (long)(1e16+5)
#define MIN (long)(-1e16-5)
#define FILEIN_ freopen("__in.txt","r",stdin)
#define FILEOUT_ freopen("__out.txt","w",stdout)
#define FILEIO_ freopen("__in.txt","r",stdin),freopen("__out.txt","w",stdout)
#define FILEIN(text) freopen(text,"r",stdin)
#define FILEOUT(text) freopen(text,"w",stdout)
#define FILEIO(text) freopen(text".in","r",stdin),freopen(text".out","w",stdout)
 
char c1[5],c2[5];
umap<long,long> in,out;
pair<int,int> a[100005];
 
main(){
	long t,i,j,k,n,m,x,y,res=0,l=0,r=0,mn=MAX,rr,mx=0;
	set<long> pos,rpos;
	in.reserve(200005);
	out.reserve(200005);
	
	scanf("%lld %lld",&m,&n);
	if(m != 1) return 136;
	for(i = 1; i <= n; i++){
		scanf("%s %lld %s %lld",c1,&x,c2,&y);
		x++;
		y++;
		if(x > y) swap(x,y);
		res += y-x;
		if(c1[0] == c2[0]){
			n--;
			i--;
			continue;
		}
		a[i] = {x,y};
		res++;
		in[x]++;
		out[y]++;
		pos.emplace(x);
		pos.emplace(y);
		mx = max(mx,y);
	}
	for(x = 1; x <= mx; x++){
		rr = res;
		for(i = 1; i <= n; i++){
			if(x >= a[i].x && x <= a[i].y) continue;
			rr += min(abs(a[i].x-x),abs(a[i].y-x))*2;
		}
		if(rr < mn){
			rpos.clear();
			rpos.emplace(x);
			mn = rr;
		}
		else if(rr == mn){
			rpos.emplace(x);
			mn = rr;
		}
//		printf("%d -> %d\n",x,rr);
	}
	bool ok = false;
	for(long x : rpos){
		if(pos.find(x) != pos.end() || in[x] || out[x]){
			ok = true;
			break;
		}
	}
	if(!ok){
		return 136;
	}
	/*l = r = 0;
	for(long x : pos){
		res += x*2*in[x];
		r += in[x];
	}
	y = 0;
	for(long x : pos){
		res -= (x-y)*r*2;
		res += (x-y)*l*2;
		r -= in[x];
		l += out[x];
		mn = min(mn,res);
		y = x;
	}*/
	printf("%lld\n",mn);
 
	return 0;	
}

Compilation message (stderr)

bridge.cpp:28:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
bridge.cpp: In function 'int main()':
bridge.cpp:29:7: warning: unused variable 't' [-Wunused-variable]
  long t,i,j,k,n,m,x,y,res=0,l=0,r=0,mn=MAX,rr,mx=0;
       ^
bridge.cpp:29:11: warning: unused variable 'j' [-Wunused-variable]
  long t,i,j,k,n,m,x,y,res=0,l=0,r=0,mn=MAX,rr,mx=0;
           ^
bridge.cpp:29:13: warning: unused variable 'k' [-Wunused-variable]
  long t,i,j,k,n,m,x,y,res=0,l=0,r=0,mn=MAX,rr,mx=0;
             ^
bridge.cpp:29:29: warning: unused variable 'l' [-Wunused-variable]
  long t,i,j,k,n,m,x,y,res=0,l=0,r=0,mn=MAX,rr,mx=0;
                             ^
bridge.cpp:29:33: warning: unused variable 'r' [-Wunused-variable]
  long t,i,j,k,n,m,x,y,res=0,l=0,r=0,mn=MAX,rr,mx=0;
                                 ^
bridge.cpp:34:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld %lld",&m,&n);
                          ^
bridge.cpp:37:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s %lld %s %lld",c1,&x,c2,&y);
                                       ^

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