제출 #302126

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
302126		radaiosm7	슈퍼트리 잇기 (IOI20_supertrees)	C++17	컴파일 에러	0 ms	0 KiB

supertrees

#include "supertrees.h"
#include <bits/stdc++.h>
using namespace std;
int par[1005];
int depth[1005];
vector<int> teams[1005];
vector<pair<int, int>> uniteds;
int FindPre(int x) {
  if (par[x] == x) {
    return x;
  }  else {
    par[x] = FindPre(par[x]);
    return par[x];
  }
}

bool IsSame(int x, int y) {
  if (FindPre(x) == FindPre(y)) {
    return true;
  }

  else {
    return false;
  }
}

void Union(int x, int y) {
  int PX = FindPre(x);
  int PY = FindPre(y);

  if (depth[PX] > depth[PY]) {
    par[PY] = PX;
  }

  else if (depth[PX] < depth[PY]) {
    par[PX] = PY;
  }

  else {
    par[PY] = PX;
    depth[PX]++;
  }
}


int construct(vector<vector<int>> p) {
  int n = p.size();
  vector<vector<int>> ans(n, vector<int>(n, 0));

  for (int i=0; i < n; i++) {
    par[i] = i;
    depth[i] = 1;
  }

  for (int i=0; i < n-1; i++) {
    for (int j=i+1; j < n; j++) {
      if (p[i][j] != 0) {
        Union(i,j);
      }

      if (p[i][j] == 1) {
        uniteds.push_back(make_pair(i,j));
      }
    }
  }

  for (int i=0; i < n; i++) {
      teams[FindPre(i)].push_back(i);
  }

  for (int i=0; i < n-1; i++) {
    for (int j=i+1; j < n; j++) {
      if (p[i][j] == 0 && IsSame(i,j)) {
        return 0;
      }
    }
  }

  for (int i=0; i < n; i++) {
    if ((int)teams[i].size() == 2 && p[teams[i][0]][teams[i][1]] == 2) {
      return 0;
    }

    for (int j=0; j < (int)teams[i].size()-1; j++) {
      if (p[teams[i][j+1]][teams[i][j]] == 2) {
        ans[teams[i][j+1]][teams[i][j]] = 1;
        ans[teams[i][j]][teams[i][j+1]] = 1;
      }
    }

    if ((int)teams[i].size() > 1) {
      ans[teams[i][0]][teams[i][(int)teams[i].size()-1]] = 1;
      ans[teams[i][(int)teams[i].size()-1]][teams[i][0]] = 1;
    }
  }

  for (i=0; i < uniteds.size(); i++) {
    ans[uniteds[i].first][uniteds[i].second] = 1;
    ans[uniteds[i].second][uniteds[i].first] = 1;
  }

  build(ans);
  return 1;
}

컴파일 시 표준 에러 (stderr) 메시지

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:97:8: error: 'i' was not declared in this scope
   97 |   for (i=0; i < uniteds.size(); i++) {
      |        ^