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华东交通大学2014年ACM“双基”程序设计竞赛(部分水题)

2014-11-30 12:58 330 查看
目前还是个渣渣,只能做做水题,暂且把能在规定时间内做出来的题发出来

A题:题目链接http://acm.hdu.edu.cn/diy/contest_showproblem.php?pid=1001&cid=25698&problem=Problem%20%20A

简单的字符输入及计数,注意循环的问题就没问题

#include <cmath>
#include <cctype>
#include <cstdio>
#include <string>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;
#define id 10001
#define Max(a,b) ((a)>(b)?(a):(b))
#define Min(a,b) ((a)<(b)?(a):(b))
int main()
{
int t;

scanf("%d",&t);
while( t-- )
{
int n,m;
int flag = 0;
int i = 0,j = 0,p = 0,q = 0,x = 0, y = 0;
char a;

cin >> n >> m;
a = getchar();
while(n--){

for(;;)
{
a=getchar();
if (a == '\n')
break;
if (a == 'I')
i++;
if (a == 'L')
j++;
if (a == 'O')
p++;
if (a == 'V')
q++;
if (a == 'E')
x++;
if (a == 'U')
y++;
}
}
int b =0;
b = Min(i,j);
b = Min(b,p);
b = Min(b,q);
b = Min(b,x);
b = Min(b,y);
if (b >= m){
cout << "KK will have a girlfriend!"<<endl;
}
else{
cout << "KK can only have gay friend~"<<endl;
}
}

return 0;
}


C题:http://acm.hdu.edu.cn/diy/contest_showproblem.php?pid=1003&cid=25698&problem=Problem%20%20C

看得懂题意应该就能写出来吧,确实简单

#include <cmath>
#include <cctype>
#include <cstdio>
#include <string>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;

#define id 10001
#define Max(a,b) ((a)>(b)?(a):(b))
#define Min(a,b) ((a)<(b)?(a):(b))
int x[id];
float y[id];
int main()
{
int t;
scanf("%d",&t);
while( t-- )
{
memset(x,0,sizeof(x[id]));
int n,k;
int i =0;
cin>>n;
while(n--){
cin>>x[i];
i++;
}
cin>>k;
int m = k;
while(k--){
int l,r;
int sum = 0;
cin>>l>>r;
for (int s = l;s <= r;s++)
sum += x[s-1];
y[k] = (float)sum / (r-l+1);
printf("%.2f\n",y[k]);
}
}
return 0;
}


D题:http://acm.hdu.edu.cn/diy/contest_showproblem.php?pid=1004&cid=25698&problem=Problem%20%20D

数组输入加上排序就OK了,不过要注意输出格式问题

#include <cmath>
#include <cctype>
#include <cstdio>
#include <string>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;

#define id 10001
#define Max(a,b) ((a)>(b)?(a):(b))
#define Min(a,b) ((a)<(b)?(a):(b))
int x[id];

int main()
{
int t;
scanf("%d",&t);
while( t-- )
{
memset(x,0,sizeof(x[id]));
int n,k;
int i =0;
cin>>n;
while(n--){
cin>>x[i];
i++;
}
sort(x,x+i);
for (int j = 0; j < i-1; j++){
cout << x[j] << " ";
}
cout << x[i-1]<<endl;

}

return 0;
}


这次比赛的题让我感觉自己还是只会做简单题,对于有难度的题,还是会无从下手,以后要加强思维能力的训练,对算法的学习和理解都还远远不够,还是要多多刷题,期待量变引起质变的那天。每次都会有一题能做出来却总是WA,没找到错误,在这里也贴出来吧,留待有空再看看。

B题:http://acm.hdu.edu.cn/diy/contest_showproblem.php?pid=1002&cid=25698&problem=Problem%20%20B

感觉就是一道简单的物理题,把各种情况考虑进去,但还是没过(也许是太长时间不接触物理脑子不行了)。

#include <cmath>
#include <cctype>
#include <cstdio>
#include <string>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;

#define g 9.8
#define Max(a,b) ((a)>(b)?(a):(b))
#define Min(a,b) ((a)<(b)?(a):(b))

int main()
{
int t;
scanf("%d",&t);
while( t-- )
{
int x1,x2,y,vx;
double vy,s;
cin>>x1>>x2>>y>>vx;

if (x2 < x1 || (x1 == x2 && vx != 0) || (vx == 0 && x1 != x2) || y < 0 || vx < 0 ){
cout <<"Xue di so diao can fly"<<endl;
continue;
}

if (y == 0)
{
vy = 0;
printf("%.2f\n",vy);
continue;
}

if (vx != 0 && x1 != x2){
s = (double)(x2-x1)/vx;
vy = (double)(y + s * s * g / 2) / s;
}

if (vx == 0 && x1 == x2)
vy = sqrt(2*g*y);
printf("%.2f\n",vy);
}

return 0;
}
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