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最新推荐文章于 2023-05-29 21:22:47 发布

timluoTC

最新推荐文章于 2023-05-29 21:22:47 发布

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分类专栏： ACM解题报告文章标签： im

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http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=4109

模拟+KM。表示只会写模拟。。。手贱把'\0' 写成' \n ' 而导致RE。

#include <stdio.h>
#include <string.h>
#include <vector>
#include <iostream>
using namespace std;
#define _clr(x) memset(x,  -1, sizeof(int)*MAXN)
#define MAXN 40
#define inf 10000000
#define FOR(i,s,e) for (int i=(s);(i)<(e);i++)
 int sign_a[35];
int sign_b[35];
int mat[40][40];
int match1[40];
int match2[40];
int km(int m, int n, int mat[][MAXN], int* match1, int* match2)
{
 int s[MAXN];
 int t[MAXN];
 int l1[MAXN];
 int l2[MAXN];
 int p;
 int q;
 int ret = 0;
 int i;
 int j;
 int k;
 for (i=0; i<m; i++)
 {
  for (l1[i]=-inf,j=0; j<n; j++)
   l1[i] = mat[i][j] > l1[i] ? mat[i][j]:l1[i];
  if (l1[i] == -inf) return -1;
 }

 for (i=0; i<n; l2[i++] = 0);
 for (_clr(match1), _clr(match2), i=0; i<m; i++)
 {
  for ((_clr(t)), s[p=q=0]=i; p<=q && match1[i] < 0; p++)
   for (k=s[p],j=0; j < n && match1[i] < 0; j++)
    if (l1[k] + l2[j] == mat[k][j] && t[j] < 0)
    {
     s[++q] = match2[j],t[j] = k;
     if (s[q] < 0)

      for (p = j; p>=0; j=p)
       match2[j] = k =t[j], p = match1[k], match1[k] = j;
    }
      if (match1[i] < 0)
      {
       for (i--,p=inf,k=0; k<=q; k++)
        for (j=0; j<n; j++)
         if (t[j] < 0 && l1[s[k]] + l2[j] - mat[s[k]][j] < p)
          p = l1[s[k]] + l2[j] - mat[s[k]][j];
         for (j=0; j<n; l2[j]+=t[j]<0?0:p,j++);
         for (k = 0; k <= q; l1[s[k++]]-=p);

      }
    }
    for (i=0; i<m; i++)
    {
     if (match1[i] < 0) return -1;
     if (mat[i][match1[i]] <= -inf) return -1;
     ret+=mat[i][match1[i]];
    }

 return ret;
}
char s[20010];
char tea[20010];
char stu[20010];
int main()
{
    int num;
 int t,n,m,k;
 //freopen("in.txt","r",stdin);
 scanf("%d",&t);
 while (t--)
 {
  scanf("%d%d%d",&n,&k,&m);
        getchar();
  gets(s);
  num = 0;

  for (int i=0; s[i] ; i++)
  if (s[i]!=' ' )
        tea[num++]=s[i];
        tea[num]='\0';

  memset(sign_a,0,sizeof(sign_a));
   num = 1;

   for (int i=0; tea[i]; i++)
  if (tea[i]>='A' && tea[i]<='Z' && sign_a[tea[i]-'A'] == 0)
   sign_a[tea[i]-'A']=num++;
   FOR(i,0,m)
  {
     memset(sign_b,0,sizeof(sign_b));
   memset(mat,0,sizeof(mat));
   gets(s);
   num = 0;
   for (int i=0; s[i]; i++)
   if (s[i]!=' ')
   stu[num++]=s[i];
   stu[num]='\0';
            num =1;
   for (int i=0; stu[i]; i++)
   if (stu[i]>='A' && stu[i]<='Z' && sign_b[stu[i]-'A'] == 0)
    sign_b[stu[i]-'A']=num++;
            for (int i=0; tea[i]; i++)
                mat[sign_a[tea[i]-'A']-1][sign_b[stu[i]-'A']-1]++;

    printf("%.4lf\n",km(k,k,mat,match1,match2)*1.0/n );
  }
 }
 return 0;
}

http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=4109

模拟+KM。表示只会写模拟。。。手贱把'\0' 写成' \n ' 而导致RE。