Submission #551468

#	Time	Username	Problem	Language	Result	Execution time	Memory
551468		1ne	Fountain Parks (IOI21_parks)	C++17	5 / 100	937 ms	97392 KiB

parks

#include "parks.h"
#include<bits/stdc++.h>
using namespace std;
struct edges{
	int x,y,x1,y1;
};
int construct_roads(std::vector<int> x, std::vector<int> y) {
	 map<pair<int,int>,bool>mp,got,have;
	 map<pair<int,int>,int>index;
	 int n = (int)x.size();
	 for (int i = 0;i<n;++i){
		 mp[{x[i],y[i]}] = true;
		 got[{x[i],y[i]}] = false;
		 index[{x[i],y[i]}] = i;
	 }
	 auto comp = [&](int a,int b,int c,int d){
		if (a<c){
			return (edges){a,b,c,d};
		}
		else if (c < a){
				return (edges){c,d,a,b};
		}
		else if ( b < d){
			return (edges){a,b,c,d};
		}
		return (edges){c,d,a,b};
	 };
	  vector<int>uu,vv,a,b;
	 vector<edges>ans;
	 vector<int>dx = {2,0,-2,0};
	 vector<int>dy = {0,2,0,-2};
	 function<void(int,int)> dfs = [&](int u,int v){
		 got[{u,v}] = true;
		 for (int i = 0;i<4;++i){
			 int xx = u + dx[i];
			 int yy = v + dy[i];
			 if (mp[{xx,yy}] && !got[{xx,yy}]){
				 uu.push_back(index[{u,v}]);
				 vv.push_back(index[{xx,yy}]);
				 if (u == xx){
					 if (v < yy){
						 a.push_back(u - 1);
						 b.push_back(v + 1);
					 }
					 else{
						 a.push_back(u + 1);
						 b.push_back(v-1);
					 }
				 }
				 else{
					 if (u < xx){
						 a.push_back(u - 1);
						 b.push_back(v - 1);
					 }
					 else{
						 a.push_back(u+1);
						 b.push_back(v + 1);
					 }
				 }
				 dfs(xx,yy);
			 }
		 }
	 };
	 bool ok = true;
	 dfs(x[0],y[0]);
	 for (int i = 0;i<n;++i){
		 if (!got[{x[i],y[i]}]){
			 ok=false;
			 break;
		 }
	 }
	 if (!ok){
		 return 0;
	 }
	 build(uu,vv,a,b);
    return 1;
}

Compilation message (stderr)

parks.cpp: In function 'int construct_roads(std::vector<int>, std::vector<int>)':
parks.cpp:16:8: warning: variable 'comp' set but not used [-Wunused-but-set-variable]
   16 |   auto comp = [&](int a,int b,int c,int d){
      |        ^~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30