JavaScript写法
const readline = require('readline')
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout,
})
const input = []
let s=[];//存储前缀和
s[0]=0;
rl.on('line',function(line){
input.push(line)
})
rl.on('close',function(){
// console.log(input);
let n= parseInt(input[0].split(' ')[0]);//长度
let m =parseInt(input[0].split(' ')[1]);//m个询问
let arr = input[1].split(' ').map(item=>parseInt(item));//数组
// console.log(arr);
for(let i=1;i<=arr.length;i++){
s[i]=s[i-1]+arr[i-1];
}
let index=2;
while(m--){
let l = parseInt(input[index].split(' ')[0]);
let r = parseInt(input[index].split(' ')[1]);
console.log(s[r]-s[l-1]);
index++;
}
})