P2327

code[class*="language-"] {
padding: .1em;
border-radius: .3em;
white-space: normal;
background: #f5f5f5;
}

.token.comment,
.token.blockquote {
color: #969896;
}

.token.cdata {
color: #183691;
}

.token.doctype,
.token.punctuation,
.token.variable,
.token.macro.property {
color: #333;
}

.token.operator,
.token.important,
.token.keyword,
.token.rule,
.token.builtin {
color: #a71d5d;
}

.token.string,
.token.url,
.token.regex,
.token.attr-value {
color: #183691;
}

.token.property,
.token.number,
.token.boolean,
.token.entity,
.token.atrule,
.token.constant,
.token.symbol,
.token.command,
.token.code {
color: #0086b3;
}

.token.tag,
.token.selector,
.token.prolog {
color: #63a35c;
}

.token.function,
.token.namespace,
.token.pseudo-element,
.token.class,
.token.class-name,
.token.pseudo-class,
.token.id,
.token.url-reference .token.variable,
.token.attr-name {
color: #795da3;
}

.token.entity {
cursor: help;
}

.token.title,
.token.title .token.punctuation {
font-weight: bold;
color: #1d3e81;
}

.token.list {
color: #ed6a43;
}

.token.inserted {
background-color: #eaffea;
color: #55a532;
}

.token.deleted {
background-color: #ffecec;
color: #bd2c00;
}

.token.bold {
font-weight: bold;
}

.token.italic {
font-style: italic;
}

/* JSON */
.language-json .token.property {
color: #183691;
}

.language-markup .token.tag .token.punctuation {
color: #333;
}

/* CSS */
code.language-css,
.language-css .token.function {
color: #0086b3;
}

/* YAML */
.language-yaml .token.atrule {
color: #63a35c;
}

code.language-yaml {
color: #183691;
}

/* Ruby */
.language-ruby .token.function {
color: #333;
}

/* Markdown */
.language-markdown .token.url {
color: #795da3;
}

/* Makefile */
.language-makefile .token.symbol {
color: #795da3;
}

.language-makefile .token.variable {
color: #183691;
}

.language-makefile .token.builtin {
color: #0086b3;
}

/* Bash */
.language-bash .token.keyword {
color: #0086b3;
}html body{font-family:"Helvetica Neue",Helvetica,"Segoe UI",Arial,freesans,sans-serif;font-size:16px;line-height:1.6;color:#333;background-color:#fff;overflow:initial;box-sizing:border-box;word-wrap:break-word}html body>:first-child{margin-top:0}html body h1,html body h2,html body h3,html body h4,html body h5,html body h6{line-height:1.2;margin-top:1em;margin-bottom:16px;color:#000}html body h1{font-size:2.25em;font-weight:300;padding-bottom:.3em}html body h2{font-size:1.75em;font-weight:400;padding-bottom:.3em}html body h3{font-size:1.5em;font-weight:500}html body h4{font-size:1.25em;font-weight:600}html body h5{font-size:1.1em;font-weight:600}html body h6{font-size:1em;font-weight:600}html body h1,html body h2,html body h3,html body h4,html body h5{font-weight:600}html body h5{font-size:1em}html body h6{color:#5c5c5c}html body strong{color:#000}html body del{color:#5c5c5c}html body a:not([href]){color:inherit;text-decoration:none}html body a{color:#08c;text-decoration:none}html body a:hover{color:#00a3f5;text-decoration:none}html body img{max-width:100%}html body>p{margin-top:0;margin-bottom:16px;word-wrap:break-word}html body>ul,html body>ol{margin-bottom:16px}html body ul,html body ol{padding-left:2em}html body ul.no-list,html body ol.no-list{padding:0;list-style-type:none}html body ul ul,html body ul ol,html body ol ol,html body ol ul{margin-top:0;margin-bottom:0}html body li{margin-bottom:0}html body li.task-list-item{list-style:none}html body li>p{margin-top:0;margin-bottom:0}html body .task-list-item-checkbox{margin:0 .2em .25em -1.8em;vertical-align:middle}html body .task-list-item-checkbox:hover{cursor:pointer}html body blockquote{margin:16px 0;font-size:inherit;padding:0 15px;color:#5c5c5c;border-left:4px solid #d6d6d6}html body blockquote>:first-child{margin-top:0}html body blockquote>:last-child{margin-bottom:0}html body hr{height:4px;margin:32px 0;background-color:#d6d6d6;border:0 none}html body table{margin:10px 0 15px 0;border-collapse:collapse;border-spacing:0;display:block;width:100%;overflow:auto;word-break:normal;word-break:keep-all}html body table th{font-weight:bold;color:#000}html body table td,html body table th{border:1px solid #d6d6d6;padding:6px 13px}html body dl{padding:0}html body dl dt{padding:0;margin-top:16px;font-size:1em;font-style:italic;font-weight:bold}html body dl dd{padding:0 16px;margin-bottom:16px}html body code{font-family:Menlo,Monaco,Consolas,'Courier New',monospace;font-size:.85em !important;color:#000;background-color:#f0f0f0;border-radius:3px;padding:.2em 0}html body code::before,html body code::after{letter-spacing:-0.2em;content:"\00a0"}html body pre>code{padding:0;margin:0;font-size:.85em !important;word-break:normal;white-space:pre;background:transparent;border:0}html body .highlight{margin-bottom:16px}html body .highlight pre,html body pre{padding:1em;overflow:auto;font-size:.85em !important;line-height:1.45;border:#d6d6d6;border-radius:3px}html body .highlight pre{margin-bottom:0;word-break:normal}html body pre code,html body pre tt{display:inline;max-width:initial;padding:0;margin:0;overflow:initial;line-height:inherit;word-wrap:normal;background-color:transparent;border:0}html body pre code:before,html body pre tt:before,html body pre code:after,html body pre tt:after{content:normal}html body p,html body blockquote,html body ul,html body ol,html body dl,html body pre{margin-top:0;margin-bottom:16px}html body kbd{color:#000;border:1px solid #d6d6d6;border-bottom:2px solid #c7c7c7;padding:2px 4px;background-color:#f0f0f0;border-radius:3px}@media print{html body{background-color:#fff}html body h1,html body h2,html body h3,html body h4,html body h5,html body h6{color:#000;page-break-after:avoid}html body blockquote{color:#5c5c5c}html body pre{page-break-inside:avoid}html body table{display:table}html body img{display:block;max-width:100%;max-height:100%}html body pre,html body code{word-wrap:break-word;white-space:pre}}.markdown-preview{width:100%;height:100%;box-sizing:border-box}.markdown-preview .pagebreak,.markdown-preview .newpage{page-break-before:always}.markdown-preview pre.line-numbers{position:relative;padding-left:3.8em;counter-reset:linenumber}.markdown-preview pre.line-numbers>code{position:relative}.markdown-preview pre.line-numbers .line-numbers-rows{position:absolute;pointer-events:none;top:1em;font-size:100%;left:0;width:3em;letter-spacing:-1px;border-right:1px solid #999;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}.markdown-preview pre.line-numbers .line-numbers-rows>span{pointer-events:none;display:block;counter-increment:linenumber}.markdown-preview pre.line-numbers .line-numbers-rows>span:before{content:counter(linenumber);color:#999;display:block;padding-right:.8em;text-align:right}.markdown-preview .mathjax-exps .MathJax_Display{text-align:center !important}.markdown-preview:not([for="preview"]) .code-chunk .btn-group{display:none}.markdown-preview:not([for="preview"]) .code-chunk .status{display:none}.markdown-preview:not([for="preview"]) .code-chunk .output-div{margin-bottom:16px}.scrollbar-style::-webkit-scrollbar{width:8px}.scrollbar-style::-webkit-scrollbar-track{border-radius:10px;background-color:transparent}.scrollbar-style::-webkit-scrollbar-thumb{border-radius:5px;background-color:rgba(150,150,150,0.66);border:4px solid rgba(150,150,150,0.66);background-clip:content-box}html body[for="html-export"]:not([data-presentation-mode]){position:relative;width:100%;height:100%;top:0;left:0;margin:0;padding:0;overflow:auto}html body[for="html-export"]:not([data-presentation-mode]) .markdown-preview{position:relative;top:0}@media screen and (min-width:914px){html body[for="html-export"]:not([data-presentation-mode]) .markdown-preview{padding:2em calc(50% - 457px)}}@media screen and (max-width:914px){html body[for="html-export"]:not([data-presentation-mode]) .markdown-preview{padding:2em}}@media screen and (max-width:450px){html body[for="html-export"]:not([data-presentation-mode]) .markdown-preview{font-size:14px !important;padding:1em}}@media print{html body[for="html-export"]:not([data-presentation-mode]) #sidebar-toc-btn{display:none}}html body[for="html-export"]:not([data-presentation-mode]) #sidebar-toc-btn{position:fixed;bottom:8px;left:8px;font-size:28px;cursor:pointer;color:inherit;z-index:99;width:32px;text-align:center;opacity:.4}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] #sidebar-toc-btn{opacity:1}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc{position:fixed;top:0;left:0;width:300px;height:100%;padding:32px 0 48px 0;font-size:14px;box-shadow:0 0 4px rgba(150,150,150,0.33);box-sizing:border-box;overflow:auto;background-color:inherit}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc::-webkit-scrollbar{width:8px}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc::-webkit-scrollbar-track{border-radius:10px;background-color:transparent}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc::-webkit-scrollbar-thumb{border-radius:5px;background-color:rgba(150,150,150,0.66);border:4px solid rgba(150,150,150,0.66);background-clip:content-box}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc a{text-decoration:none}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc ul{padding:0 1.6em;margin-top:.8em}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc li{margin-bottom:.8em}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc ul{list-style-type:none}html 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html .markdown-preview.markdown-preview {
font-family: 'PingFang SC', 'Consolas', 'Microsoft YaHei', sans-serif, monospace;
}
@font-face {
font-family: 'PingFang SC';
src: url('file:///c:/windows/fonts/PingFang Regular.ttf');
}
html .markdown-preview.markdown-preview code {
font-family: 'Consolas', 'PingFang SC', 'Microsoft YaHei', sans-serif, monospace;
}
html .markdown-preview.markdown-preview h1,
html .markdown-preview.markdown-preview h2,
html .markdown-preview.markdown-preview h3,
html .markdown-preview.markdown-preview h4,
html .markdown-preview.markdown-preview h5,
html .markdown-preview.markdown-preview h6 {
font-family: 'PingFang SC', 'Consolas', 'Microsoft YaHei', monospace, sans-serif;
}

-->

P2327 [SCOI2005]扫雷

题目描述

输入输出格式

输入格式：

第一行为N，第二行有N个数，依次为第二列的格子中的数。（1<=N<=10000）

输出格式：

一个数，即第一列中雷的摆放方案数。

输入输出样例

输入样例#1：

2
1 1

输出样例#1：

2

做法:

题解区大家都是八仙过海.
我想了一种比较恶心但是能过的方法.比题解区某些做法要好一点点.

首先需要分析一下这个题目,经过一番脑洞之后发现答案必定 大于0小于等于2 根据这个原理我们就可以大力模拟或者是搜索.
当然也可以 dp .万物皆可dp

然后这个做法就是 dp 做法.

$$f[i][j][k]表示当前位置为 i ,当前位置是不是雷(用j表示),下一位置需不需要是雷(k)的方案数.$$

转移就根据上一位置的选择.

#include<iostream>
#include<cstdio>
#define N 10005
using namespace std;

void read(int &s){
    char ch=getchar();
    for(;!isdigit(ch);ch=getchar());
    for(s=0;isdigit(ch);s=s*10+ch-'0',ch=getchar());
}

int n;
int g[N];
int f[N][2][2];

int main(){
    read(n);
    for(int i=1;i<=n;++i)read(g[i]);
    f[0][0][0]=f[0][0][1]=1;
    for(int i=1;i<=n;++i){
        if(g[i]==0){
            f[i][0][0]+=f[i-1][0][0];
        }
        if(g[i]==1){
            f[i][0][0]+=f[i-1][1][0];
            f[i][1][0]+=f[i-1][0][1];
            f[i][0][1]+=f[i-1][0][0];
        }
        if(g[i]==2){
            f[i][1][1]+=f[i-1][0][1];
            f[i][0][1]+=f[i-1][1][0];
            f[i][1][0]+=f[i-1][1][1];
        }
        if(g[i]==3)
            f[i][1][1]+=f[i-1][1][1];
    }
    printf("%d",f[n][0][0]+f[n][1][0]);
    return 0;
}

• P2327 [SCOI2005]扫雷
  • 题目描述
  • 输入输出格式
    • 输入格式：
    • 输出格式：
  • 输入输出样例
    • 输入样例#1：
    • 输出样例#1：
  • 做法:

≡