제출 #200307

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
200307		Nordway	무지개나라 (APIO17_rainbow)	C++14	0 / 100	19 ms	504 KiB

rainbow

#include<bits/stdc++.h>
#include "rainbow.h"

#define x first
#define y second
#define pb push_back
#define sz(v) (int)v.size()

using namespace std;

const int N=1e3+11;
const int dx[4]={0,0,-1,1};
const int dy[4]={1,-1,0,0};

int n,m;
int x,y;
string s;
bool used[N][N];
bool us[2][200011];
int cnt[200011],p[2][200011];

void init(int R, int C, int sr, int sc, int M, char* S) {
  n=R;
  m=C;
  x=sr,y=sc;
  s=S;
  if(n==2){
    us[sr][sc]=1;
    for(int i=0;i<M;i++){
      if(s[i]=='N')sr--;
      if(s[i]=='S')sr++;
      if(s[i]=='W')sc--;
      if(s[i]=='E')sc++;
      us[sr][sc]=1;
    }
    int lst=0;
    for(int i=1;i<=m;i++){
      int cur=3;
      for(int j=1;j<=2;j++){
        if(us[j][i])cur^=(1<<(j-1));
      }
      if((lst&cur)==0)cnt[i]=cnt[i-1]+1;
      else cnt[i]=cnt[i-1];
      lst=cur;
    }
    for(int i=1;i<=2;i++){
      for(int j=1;j<=m;j++){
        if(us[i][j]==0)p[i][j]=p[i][j-1];
        else if(us[i][j-1]==1)p[i][j]=p[i][j-1];
        else p[i][j]=p[i][j-1]+1;
      }
    }
  }
}

void dfs(int r,int c){
  used[r][c]=1;
  //cout<<r<<" "<<c<<endl;
  for(int i=0;i<4;i++){
    int nx=r+dx[i],ny=c+dy[i];
    if(used[nx][ny])continue;
    dfs(nx,ny);
  }
}

int colour(int ar, int ac, int br, int bc) {
  if(n==2){
    if(ar==br){
      return p[ar][bc]-p[ar][ac-1];
    }
    else{
      return cnt[bc]-cnt[ac-1];
    }
  }
  else if(max(n,m)<=50){
    int ans=0;
    for(int i=0;i<=n+1;i++){
      for(int j=0;j<=m+1;j++){
        if(ar<=i&&i<=br&&ac<=j&&j<=bc){
          used[i][j]=0;
          continue;
        }
        used[i][j]=1;
      }
    }
    int sr=x,sc=y;
    used[sr][sc]=1;
    for(int i=0;i<sz(s);i++){
      if(s[i]=='N')sr--;
      if(s[i]=='S')sr++;
      if(s[i]=='W')sc--;
      if(s[i]=='E')sc++;
      used[sr][sc]=1;
    }
   /* for(int i=0;i<=n+1;i++){
      for(int j=0;j<=m+1;j++){
        cout<<used[i][j];
      }
      cout<<endl;
    }*/
    for(int i=ar;i<=br;i++){
      for(int j=ac;j<=bc;j++){
        if(!used[i][j]){
          dfs(i,j);
          //cout<<endl;
          ans++;
        }
      }
    }
    return ans;
  }
}

컴파일 시 표준 에러 (stderr) 메시지

rainbow.cpp: In function 'int colour(int, int, int, int)':
rainbow.cpp:112:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
rainbow.cpp: In function 'void init(int, int, int, int, int, char*)':
rainbow.cpp:40:19: warning: iteration 1 invokes undefined behavior [-Waggressive-loop-optimizations]
         if(us[j][i])cur^=(1<<(j-1));
            ~~~~~~~^
rainbow.cpp:39:20: note: within this loop
       for(int j=1;j<=2;j++){
                   ~^~~
rainbow.cpp:40:16: warning: array subscript is above array bounds [-Warray-bounds]
         if(us[j][i])cur^=(1<<(j-1));
            ~~~~^

• Subtask 1: 0 / 11
• Subtask 2: 0 / 12
• Subtask 3: 0 / 24
• Subtask 4: 0 / 27
• Subtask 5: 0 / 26