C语言练习-洛谷【入门2】分支结构

1、P2433 【深基1-2】小学数学 N 合一

#include 
#include 
#include 
#include 
int main()
{
    int T;
    scanf("%d", &T);
    if (T == 1)
    {
        printf("I love Luogu!");
    }
    else if (T == 2)
    {
        printf("%d %d", 2+4, 10-2-4);
    }
    else if (T == 3)
    {
         printf("%d\n%d\n%d\n", 14/4, (14/4)*4,14%4);
    }
    else if (T == 4)
    {
       printf("%.3f",(double)(500.0/3.0));
    }
    else if (T == 5)
    {
       printf("%d",(260+220)/(12+20));
    }
    else if (T == 6)
    {
        printf("%.4f",sqrt(6*6+9*9));
    }
    else if (T == 7)
    {
        printf("%d\n%d\n%d",100+10,100+10-20,0);
    }
    else if (T == 8)
    {
        double r=5,p=3.141593,c,s,v;
        c=2*p*r;
        s=p*r*r;
        v=1.0*4/3*p*r*r*r;
        printf("%.4f\n%.4f\n%.3f",c,s,v);
        
    }
    else if (T == 9)
    {
        int m=(((1+1)*2+1)*2+1)*2;
        printf("%d",m);
    }
    else if (T == 10)
    {
        int a=9;
         printf("%d",a);
    }
    else if (T == 11)
    {
        printf("%.4f",1.0*100/3);
    }
    else if (T == 12)
    {
        printf("%d\n%c",'M'-'A'+1,'A'+18-1);
    }
    else if (T == 13)
    {
        double pi=3.141593;
        printf("%d",(int)(pow(4.0/3*pi*(4*4*4+10*10*10),1.0*1/3)));
    }
    else if (T == 14)
    {
        int n=50;
        printf("%d",n);
    }
    return 0;
}

2、P5709 【深基2.习6】Apples Prologue / 苹果和虫子

#include 
#include 
#include 
#include 
int main()
{
  int m,t,s,n;
  scanf("%d %d %d",&m,&t,&s);
   if(t==0){printf("0");return 0;}
  if(s%t==0)n=m-s/t;
  else n=m-s/t-1;
  if(n<=0){printf("0");return 0;}
  printf("%d",n);
}

3、P5710 【深基3.例2】数的性质

#include 
#include 
#include 
#include 
int main()
{
    int x;
    scanf("%d",&x);
    int count=0;
    if(x%2==0) count++;
    if(x>4&&x<=12)count++;
    int a=0,u=0,b=0,z=0;
    if(count==0)z=1;
    if(count==2)a=1;
    if(count>=1)u=1;
    if(count==1)b=1;
    printf("%d %d %d %d",a,u,b,z);


}

4、P5711 【深基3.例3】闰年判断

#include 
#include 
#include 
#include 
int main()
{
    int n,t=0;
    scanf("%d",&n);
   if((n%4==0&&n%100!=0)||(n%400==0&&n%100==0))t=1;
    printf("%d",t);
    return 0;


}

5、P5712 【深基3.例4】Apples

#include 
#include 
#include 
#include 
int main()
{
    int n;
    scanf("%d", &n);
    if (n == 0 || n == 1)
    {
        printf("Today, I ate %d apple.", n);
    }
    else
    {
        printf("Today, I ate %d apples.", n);
    }
}

6、P5713 【深基3.例5】洛谷团队系统

#include 
#include 
#include 
#include 
int main()
{
    int n;
    scanf("%d",&n);
    if(5*n>11+3*n)printf("Luogu");
    else printf("Local");
    return 0;

}

7、P5714 【深基3.例7】肥胖问题

#include 
#include 
#include 
#include 
int main()
{
    double m,h,b;
    scanf("%lf %lf",&m,&h);
    b=1.0*m/(h*h);
    if(b<18.5)printf("Underweight");
    if(b>=18.5&&b<24)printf("Normal");
    if(b>=24)printf("%.4lf\nOverweight",b);
}

8、P5715 【深基3.例8】三位数排序

#include 
#include 
#include 
#include 
int main(){
	int a, b, c, t;
	scanf("%d%d%d", &a, &b, &c);
	if( a > b ){
		t = a;
		a = b;
		b = t;
	}
	if( a > c){
		t = a;
		a = c;
		c = t;
	}
	if( b > c ){
		t = b;
		b = c;
		c = t;
	}
	printf("%d %d %d", a, b, c);
	return 0;
}

9、P5716 【深基3.例9】月份天数

#include 
#include 
#include 
#include 
int main()
{
    int y,m;
    int day[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    scanf("%d %d",&y,&m);
    if((y%4==0&&y%100!=0)||(y%400==0&&y%100==0))day[2]=29;
    printf("%d",day[m]);

}

10、P1085 [NOIP2004 普及组] 不高兴的津津

#include 
#include 
#include 
#include 
int main()
{
int a,b;
  int i,j;
  int s=0,max=0;
  for(i=0;i<7;i++){
          scanf("%d %d",&a,&b);
          if(a+b>max&&a+b>8) {
              max=a+b;
              s=i+1;}
  }
  printf("%d",s);
  return 0;


}

11、P1909 [NOIP2016 普及组] 买铅笔

#include 
#include 
#include 
#include 
int main()
{
    int n;
    int a1,a2,a3,b1,b2,b3;
    scanf("%d",&n);
    scanf("%d %d",&a1,&b1);
    scanf("%d %d",&a2,&b2);
    scanf("%d %d",&a3,&b3);
    //printf("输入成功%d",n);
    int c1,c2,c3,d1,d2,d3,d4;
    c1=n/a1;
    if(n%a1!=0)c1+=1;
    d1=b1*c1;
    c2=n/a2;
    if(n%a2!=0)c2+=1;
    d2=b2*c2;
    c3=n/a3;
    if(n%a3!=0)c3+=1;
    d3=b3*c3;
    if(d1

12、P5717 【深基3.习8】三角形分类

#include 
#include 
#include 
#include 

int main()
{
    int a, b, c, t;
    scanf("%d %d %d", &a, &b, &c);
    if (a > b)
    {
        t = a;
        a = b;
        b = t;
    }
    if (a > c)
    {
        t = a;
        a = c;
        c = t;
    }
    if (b > c)
    {
        t = b;
        b = c;
        c = t;
    }
    
    if (a + b <=c)
        printf("Not triangle\n");
    else
    {
        if (a * a + b * b == c * c)
            printf("Right triangle\n");
        else if (a * a + b * b > c * c)
            printf("Acute triangle\n");
        else if (a * a + b * b < c * c)
            printf("Obtuse triangle\n");

        if (a == b || a == c || b == c)
            printf("Isosceles triangle\n");
        if (a == b && b == c)
            printf("Equilateral triangle\n");
    }
}

13、P1422 小玉家的电费

#include 
#include 

int main()
{int kw;
float cost;
scanf("%d",&kw);
if(kw>=0&&kw<=150)cost=kw*0.4463;
if(kw>=151&&kw<=400)cost=150*0.4463+(kw-150)*0.4663;
if(kw>=401&&kw<=10000)cost=150*0.4463+250*0.4663+(kw-400)*0.5663;
printf("%.1f",cost);
return 0;
}

14、P1424 小鱼的航程（改进版）

这道题用循环很好做，但是一开始看错题目然后修改了一下感觉这样也能写，但是一直有一个样例输出是错的，也不知道是哪里没考虑到，先暂时放上来。（已修改，通过所有样例）

#include 
#include 
#include 
#include 
#include 
int main(){
    int x, n, t;
    scanf("%d %d", &x, &n);
    if (x != 6 && x != 7)
    {
        t = (x + n) / 7;
        n = n - t * 2;
    }
 else if(x==7){
        x=1;
        t = (x + n) / 7;
        if(n%7!=0)n = n - t * 2-1;
        else n = n - t * 2;
    }
    else if(x==6){
        x=1;
        t = (x + n) / 7;
        if(n%7!=0)n = n - t * 2-2;
        else n = n - t * 2;
    }
    printf("%d", n * 250);
}

15、P1888 三角函数

#include 
#include 
#include 
#include 
int main()
{

    int a, b, c;
    int t;
    scanf("%d %d %d", &a, &b, &c);
    if (a > b)
    {
        t = a;
        a = b;
        b = t;
    }
    if (a > c)
    {
        t = a;
        a = c;
        c = t;
    }
    if (b > c)
    {
        t = b;
        b = c;
        c = t;
    }
    if (a == 6 && b == 8 && c == 10)
        printf("3/5");
    else
        printf("%d/%d", a, c);

}

16、P1046 [NOIP2005 普及组] 陶陶摘苹果

#include 
#include 
#include 
#include 
int main()
{
    int a1,a2,a3,a4,a5,a6,a7,a8,a9,a10;
    int h,count=0;
    scanf("%d %d %d %d %d %d %d %d %d %d\n%d",&a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8,&a9,&a10,&h);
    h=h+30;
    if(a1<=h)count++;
    if(a2<=h)count++;
    if(a3<=h)count++;
    if(a4<=h)count++;
    if(a5<=h)count++;
    if(a6<=h)count++;
    if(a7<=h)count++;
    if(a8<=h)count++;
    if(a9<=h)count++;
    if(a10<=h)count++;
    printf("%d",count);
    return 0;
}

17、P4414 [COCI2006-2007#2] ABC

#include 
#include 
#include 
#include 
int main()
{
    int a,b,c;
    char c1,c2,c3;
    int t;
    scanf("%d %d %d\n",&a,&b,&c);
    scanf("%c%c%c",&c1,&c2,&c3);
    if((c1b)||(c1>c2&&ac)||(c1>c3&&ac)||(c2>c3&&b

18、P1055 [NOIP2008 普及组] ISBN 号码

#include 
#include 
#include 
#include 
int main()
{
    char a[14], c1, c2;
    int s = 0;
    scanf("%c-%c%c%c-%c%c%c%c%c-%c", &a[1], &a[2], &a[3], &a[4], &a[5], &a[6], &a[7], &a[8], &a[9], &c1);
    int i;
    for (i = 1; i <= 9; i++)
    {
        s += (a[i] - '0') * i;
    }
    c2 = (s % 11) + '0';
    if(c2=='0'+10)c2='X';
    if (c1 == c2)
        printf("Right");
    else
        printf("%c-%c%c%c-%c%c%c%c%c-%c", a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], c2);
    return 0;
}

基本都是模拟题，有些知识忘了，所以都用的最简单粗暴的方法，代码比较蠢，勉强看看。