54pt,求助大佬
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  • 楼主dldltangmen
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  • 发布时间2024/5/15 21:24
  • 上次更新2024/5/16 10:05:54
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54pt,求助大佬
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dldltangmen楼主2024/5/15 21:24
#include<iostream>
#include<cmath>
#include<cstdio>
#include<cstring>
#include<string>
#include<vector>
#include<queue>
#include<deque>
#include<stack>
#include<map>
#include<algorithm>
#define ll long long
int hz[1005][1005],ans,n,m;
void dfs(int x,int y){
	if(x<1||x>n||y<1||y>m||hz[x][y]==0){
		return ;
	}
	hz[x][y]=0;
	dfs(x+1,y);
	dfs(x-1,y);
	dfs(x,y-1);
	dfs(x,y+1);
}
using namespace std;
int main(){
	cin>>n>>m;
	for(int i=1;i<=n;i++){
		string s;
		cin>>s;
		for(int j=0;j<m;j++){
			if(s[j]=='.')   hz[i][j+1]=0;
			else hz[i][j+1]=1;
		}
	}
	if(n==1&&m==1){
	    if(hz[1][1]==1)  cout<<"There are "<<1<<" ships.";
	    return 0;
	}
	if(n==1){
	    int cnt=0;
	    for(int i=1;i<=m;i++){
	        if(hz[1][i]==1&&hz[i-1][1]){
	            cnt++;
	        }
	    }
	    cout<<"There are "<<cnt<<" ships.";
	    return 0;
	}
	if(m==1){
	    int cnt=0;
	    for(int i=1;i<=n;i++){
	        if(hz[i][1]==1&&hz[1][i-1]){
	            cnt++;
	        }
	    }
	    cout<<"There are "<<cnt<<" ships.";
	    return 0;
	}
	int cnt1=0;
	for(int i=1;i<n;i++){
	    for(int j=1;j<m;j++){
	        int cnt=hz[i][j]+hz[i][j+1]+hz[i+1][j]+hz[i+1][j+1];
	        if(cnt==3){
	            cnt1++;
	            if(hz[i][j]+hz[i+1][j]==1){
	                for(int k=i;k<=n;k++){
	                    if(hz[k][j+1]==1){
	                        cnt1--;
	                        break;
	                    }
	                }
	            }
	            else if(hz[i][j+1]+hz[i+1][j+1]==1){
	                for(int k=i;k<=n;k++){
	                    if(hz[k][j]==1){
	                        cnt1--;
	                        break;
	                    }
	                }
	            }
	        }
	        
	    }
	}
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			if(hz[i][j]!=0){
				dfs(i,j);
				ans++;
			}
		}
	}
	if(ans-cnt1==0)   cout<<"Bad placement.";
	cout<<"There are "<<ans-cnt1<<" ships.";
	return 0;
}
2024/5/15 21:24
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