Submission #894882

#TimeUsernameProblemLanguageResultExecution timeMemory
894882Jawad_Akbar_JJFountain Parks (IOI21_parks)C++17
0 / 100
1 ms348 KiB
#include <iostream> #include <vector> #include <algorithm> using namespace std; #include "parks.h" #include <cstdio> #include <cmath> #include <cassert> #include <vector> #include <string> const int N = 200000 + 10; int seen[10][N]; int seen2[10][N]; int used[12][N]; int sn = 0; vector<pair<int,int>> d = {{0,2},{2,0},{-2,0},{0,-2}}; vector<int> a,b,X,Y; vector<pair<int,int>> up,nup; void dfs(int i,int j){ seen2[i][j] = true; sn++; for (auto [x,y] : d){ int ni = i + x; int nj = j + y; if (!seen[ni][nj] or seen2[ni][nj]) continue; if (i==ni and i==4) up.push_back({seen[i][j]-1,seen[ni][nj]-1}); else nup.push_back({seen[i][j]-1,seen[ni][nj]-1}); dfs(ni,nj); } } void dfs2(int i,int j){ if (seen2[i][j]) return; seen2[i][j] = true; sn++; int ni = i; int nj = j + 2; if (!seen[ni][nj] or seen2[ni][nj]) return; if (i==ni and i==4) up.push_back({seen[i][j]-1,seen[ni][nj]-1}); else nup.push_back({seen[i][j]-1,seen[ni][nj]-1}); dfs2(ni,nj); } pair<int,int> det(int x1,int y1,int x2,int y2){ if (x1 == x2){ if (y1>y2) swap(y1,y2); if (x1 == 2) return {1,y1+1}; if (x1 == 6) return {7,y1+1}; if (used[3][y1-1] or used[3][y2 + 1]) return {5,y1 + 1}; return {3,y1 + 1}; } if (x1>x2) swap(x1,x2); if (used[x1+1][y1-1]) return {x1+1,y1+1}; return {x1+1,y1-1}; } int construct_roads(vector<int> x,vector<int> y){ int n = x.size(); int mny = 1e7,k; for (int i=0;i<n;i++){ if (x[i]==2 or x[i]==6) dfs2(x[i],y[i]); } for (int i=0;i<n;i++){ if (!seen2[x[i]][y[i]]) dfs(x[i],y[i]); } dfs(k,mny); if (sn!=n) return 0; sort(begin(up),end(up)); for (auto [i,j] : up){ auto [ii,jj] = det(x[i],y[i],x[j],y[j]); used[ii][jj] = true; a.push_back(i); b.push_back(j); X.push_back(ii); Y.push_back(jj); } for (auto [i,j] : nup){ auto [ii,jj] = det(x[i],y[i],x[j],y[j]); used[ii][jj] = true; a.push_back(i); b.push_back(j); X.push_back(ii); Y.push_back(jj); } build(a,b,X,Y); return 1; }

Compilation message (stderr)

parks.cpp: In function 'int construct_roads(std::vector<int>, std::vector<int>)':
parks.cpp:111:5: warning: 'k' is used uninitialized in this function [-Wuninitialized]
  111 |  dfs(k,mny);
      |  ~~~^~~~~~~
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