ACM模式下JavaScript(js)的输入输出 V8 Node

OJ在线编程常见输入输出练习场

ACM模式下分V8和node.js

node.js=V8+内置基本模块，相当于java中的JRE=JVM+java标准库

node就是带有能操作IO和网络库的V8引擎，提供了很多可调用的API使得JavaScript能够读写文件，网络请求，系统信息等操作。对V8引擎进行了封装，执行JavaScript的速度更快，性能更好

不定行，定数目输入计算

//v8while(line =readline()){//不断读取整行let lines = line.split(' ').map(Number);//字符串转字符数组再转成Number格式let a = lines[0];let b = lines[1];
    console.log(a + b);}

//node.jslet readline =require('readline');const rl = readline.createInterface({input: process.stdin,output: process.stdout
});
rl.on('line',function(line){let lines = line.split(' ').map(Number);
        console.log(lines[0]+ lines[1]);});

部分行参与计算+输入单个数字

//V8let n =parseInt(readline());//读取一行，转数字while(line =readline()){//不断读入整行let lines = line.split(' ').map(Number);let a =parseInt(lines[0]);let b =parseInt(lines[1]);
    console.log(a + b);}

//node.jslet readline =require('readline');const rl = readline.createInterface({input: process.stdin,output: process.stdout
});let num =0;
rl.on('line',function(line){if(num ===0){
        num =parseInt(line);}else{let[x, y]= line.split(' ').map(Number);
        console.log(x + y);}});

终止输入判断(多个数字)

//V8while(line =readline()){let lines = line.split(' ');let a =parseInt(lines[0]);//可以用map将数组转数字，也可以每个数字单独转intlet b =parseInt(lines[1]);if(a ===0&& b ===0)break;//终止判断print(a + b);//输出可以用print也可以用console.log}

//node.jslet readline =require('readline');const rl = readline.createInterface({input: process.stdin,output: process.stdout
});
rl.on('line',function(line){let[x, y]= line.split(' ').map(Number);if(x ===0&& y ===0)return;
    console.log(x + y);})

终止输入判断(单个数字)

//V8while(line =readline()){let lines = line.split(' ').map(Number);//转数字数组if(lines[0]===0)break;//终止判断let res = lines.slice(1).reduce((sum, cur)=>{return sum + cur;})print(res);}

//node.jsconst readline =require('readline');const rl = readline.createInterface({input: process.stdin,output: process.stdout
});
rl.on('line',function(line){let arr = line.split(' ').map(Number);if(arr[0]===0)return;
    console.log(arr.slice(1).reduce((sum, cur)=> sum + cur));})

定行，不定数目输入计算

//V8let n =parseInt(readline());while(n--){//读取n行let line =readline().split(' ').map(Number);let res = line.slice(1).reduce((sum, cur)=>{return sum + cur;})//计算从第二个数字开始到最后的和print(res);}

//node.jsconst readline =require('readline');const rl = readline.createInterface({input: process.stdin,output: process.stdout
});let t =0;
rl.on('line',function(line){if(t ===0) t =parseInt(line);else{let arr = line.split(' ').map(Number);
        console.log(arr.slice(1).reduce((sum, cur)=> sum + cur));}})

根据每行第一个数字决定该行需要计算的数量

//V8while(line =readline()){let lines = line.split(' ').map(Number);let res =0;for(let i =1;i <= lines[0]; i++){//也可以像上一题一样直接用slice + reduce
        res += lines[i];}
    console.log(res);}

//node.jsconst readline =require('readline');const rl = readline.createInterface({input: process.stdin,output: process.stdout
});
rl.on('line',function(line){let arr = line.split(' ').map(Number);
    console.log(arr.splice(1).reduce((sum, cur)=> sum + cur));})

不定行，不定数目输入计算

//V8while(line =readline()){let lines = line.split(' ').map(Number);let res = lines.reduce((sum, cur)=>{return sum + cur;});print(res);}

//node.jsconst readline =require('readline');const rl = readline.createInterface({input: process.stdin,output: process.stdout
});
rl.on('line',function(line){let arr = line.split(' ').map(Number);
    console.log(arr.reduce((sum, cur)=> sum + cur));})

单行字符串排序输出

//V8let n =parseInt(readline());let lines =readline().split(' ');//转成数组后再用sort()方法
console.log(lines.sort().join(' '));

//node.jsconst readline =require('readline');const rl = readline.createInterface({input: process.stdin,output: process.stdout
});let n =0;
rl.on('line',function(line){if(n ===0) n =parseInt(line);else{let str = line.split(' ').sort().join(' ');
        console.log(str);}})

多行字符串各自排序空格分隔输出

//V8while(line =readline()){//读取多行let lines = line.split(' ');
    console.log(lines.sort().join(' '));}

//node.jsconst readline =require('readline');const rl = readline.createInterface({input: process.stdin,output: process.stdout
});
rl.on('line',function(line){let str = line.split(' ').sort().join(' ');
    console.log(str);})

多行字符串各自排序逗号分隔输出

//V8while(line =readline()){let lines = line.split(',');let res = lines.sort().join(',');print(res);}

//node.jsconst readline =require('readline');const rl = readline.createInterface({input: process.stdin,output: process.stdout
});
rl.on('line',function(line){let str = line.split(',').sort().join(',');
    console.log(str);})