C站算法技能题-题解(javascript)

• 切面条

const 切面条 = (n=10)=>{return 2 ** n + 1;
}
切面条(0) === 2
切面条(1) === 3
切面条(2) === 5
切面条(10) === 1025

• 大衍数列

const 大衍数列 = (n=100) => {let ans = []for(let i=1;i<=n;i++){if(i%2 == 0){ans.push((i ** 2 ) / 2)}else{ans.push((i ** 2 - 1) / 2)}}return ans;
}大衍数列(100)

• 门牌制作

const 门牌制作 = (n=2020) => {let ans = 0;for(let i=1; i <= n; i++){let x = i;while(x){if(x%10 == 2){ans ++;}x = ~~(x/10)}}return ans;
}

• 方阵转置

const 方阵转置 = (arr)=>{let {length:len} = arr;for(let n = 0; n < len; n++){for(let m = 0; m < len; m++){(m > n) && ([arr[m][n],arr[n][m]] = [arr[n][m],arr[m][n]]) }}return arr;
}
方阵转置([[34,76,-54,7],[-4, 5, 23,9],[ 0, 0, 0, 0],[ 0, 0, 0, 0]
]);

• 微生物增值

const 微生物增值 = (x=10,y=90)=>{for(let i = 1; i <= 120; i++){if(i % 2 == 1){y -= x;}if(i % 4 == 0){y *= 2}if(i % 6 == 0){x *= 2 }}return y < 0 ? 0 : y;
}
微生物增值()

• 成绩统计

const 成绩统计 = (students)=>{let [max,min] = [0,301]let mins,maxs;for(let student of students){let sum = student.yy + student.sx + student.cpp;if(min > sum){min = sum;mins = student.xm; }if(max < sum){max = sum;maxs = student.xm;}}return [maxs,mins]
}成绩统计([{xm:'yx1',xh:'1',yy:45,sx:67,cpp:87},
{xm:'yx2',xh:'2',yy:88,sx:90,cpp:99}])

• 星系炸弹

const 星系炸弹 = (year = 2014,month = 11,day = 9,days = 1000) => {const monthDays = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];for(let i = 0; i< days; i++){day ++;if(day > monthDays[month - 1]){day = 1;month ++;if(month > 12){month = 1;year ++;if(!(year % 400)||(!(year%4) && (year%100)) ){monthDays[1] = 29}else{monthDays[1] = 28}}}}return `${year}-${month}-${day}`
}
星系炸弹();

• 特别数的和

const 特别数的和 = (n = 40)=>{const check = (n)=>{while(n){let tmpn = n%10;if(tmpn == 2||tmpn == 0||tmpn == 1||tmpn == 9)return true;n=~~(n/10)}return false;}let ans = 0;for(let i=1;i<=n;i++){if(check(i)){ans += i;}}return ans;
}
特别数的和();