zoukankan      html  css  js  c++  java
  • Codeforces Round #363 (Div. 2) B. One Bomb (水题)

    B. One Bomb
    time limit per test
    1 second
    memory limit per test
    256 megabytes
    input
    standard input
    output
    standard output

    You are given a description of a depot. It is a rectangular checkered field of n × m size. Each cell in a field can be empty (".") or it can be occupied by a wall ("*").

    You have one bomb. If you lay the bomb at the cell (x, y), then after triggering it will wipe out all walls in the row x and all walls in the column y.

    You are to determine if it is possible to wipe out all walls in the depot by placing and triggering exactly one bomb. The bomb can be laid both in an empty cell or in a cell occupied by a wall.

    Input

    The first line contains two positive integers n and m (1 ≤ n, m ≤ 1000) — the number of rows and columns in the depot field.

    The next n lines contain m symbols "." and "*" each — the description of the field. j-th symbol in i-th of them stands for cell (i, j). If the symbol is equal to ".", then the corresponding cell is empty, otherwise it equals "*" and the corresponding cell is occupied by a wall.

    Output

    If it is impossible to wipe out all walls by placing and triggering exactly one bomb, then print "NO" in the first line (without quotes).

    Otherwise print "YES" (without quotes) in the first line and two integers in the second line — the coordinates of the cell at which the bomb should be laid. If there are multiple answers, print any of them.

    Examples
    input
    3 4
    .*..
    ....
    .*..
    
    output
    YES
    1 2
    
    input
    3 3
    ..*
    .*.
    *..
    
    output
    NO
    
    input
    6 5
    ..*..
    ..*..
    *****
    ..*..
    ..*..
    ..*..
    
    output
    YES
    3 3

    题意:

    让你找一个点,放一个炸弹,使所有的*都被炸掉,炸弹只影响行列,和炸弹的那个点

    题解:

    行列统计一下又多少个*,然后暴力枚举每一个点,看这行这列的*的个数是否达到了全部的*的个数

     1 #include<cstdio>
     2 #include<vector>
     3 #include<cstring>
     4 #include<algorithm>
     5 #define pb push_back
     6 #define F(i,a,b) for(int i=a;i<=b;++i)
     7 using namespace std;
     8 typedef long long LL;
     9 int n,m,anx,any,cnt=0;
    10 char g[1011][1011];
    11 vector<int>Gu[1011],Gv[1011];
    12 
    13 int main(){
    14     scanf("%d%d",&n,&m);
    15     F(i,1,n){
    16         getchar();
    17         F(j,1,m){
    18             g[i][j]=getchar();
    19             if(g[i][j]=='*'){
    20                 cnt++,anx=i,any=j;
    21                 Gu[i].pb(j);
    22                 Gv[j].pb(i);
    23             }
    24         }
    25     }
    26     if(cnt==1){
    27         printf("YES
    %d %d
    ",anx,any);
    28         return 0;
    29     }
    30     F(i,1,n)F(j,1,m){
    31         int ann=Gu[i].size()+Gv[j].size();
    32         if(g[i][j]=='*')ann--;
    33         if(ann==cnt){
    34             printf("YES
    %d %d
    ",i,j);
    35         return 0;
    36         }
    37     }
    38     puts("NO");
    39     return 0;
    40 }
    View Code


     

  • 相关阅读:
    2-3树
    B树
    负载均衡的算法种类
    String源码分析
    实现一个List集合中的某个元素的求和
    就是通过事件方法,在window.loaction.href里追加了参数字符串
    九大内置对象及四个域对象的总结
    BigDecimal add方法问题:调用add后,求和结果没变
    java中List元素移除元素的那些坑
    Java序列化和反序列化,你该知道得更多
  • 原文地址:https://www.cnblogs.com/bin-gege/p/5696071.html
Copyright © 2011-2022 走看看