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[UVA][Trie] 11286 - Conformity

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Problem B: Conformity

Frosh commencing their studies at Waterloo have diverse interests,as evidenced by their desire to take various combinations of courses fromamong those available.

University administrators are uncomfortable with this situation, andtherefore wish to offer a conformity prize to frosh who choosethe most popular combination of courses. How many frosh will winthe prize?

The input consists of several test cases followed by a line containing0. Each test case begins with an integer 1 ≤ n ≤ 10000, the number offrosh. For each frosh, a line follows containing the course numbersof five distinct courses selected by the frosh. Each course number isan integer between 100 and 499.

The popularity of a combination is the number of frosh selectingexactly the same combination of courses. A combination of coursesis considered most popular if no other combination has higherpopularity. For each line of input, you should output a single linegiving the total number of students taking some combination of courses thatis most popular.

Sample Input

3
100 101 102 103 488
100 200 300 101 102
103 102 101 488 100
3
200 202 204 206 208
123 234 345 456 321
100 200 300 400 444
0

Output for Sample Input

2
3


最受歡迎的組合可能有很多, 輸出選擇最受歡迎組合的人數

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct Trie {
int n;
int link[10];
}Node[200000];
int TrieSize;
void insertTrie(const char* str) {
static int i, idx;
idx = 0;
for(i = 0; str[i]; i++) {
if(Node[idx].link[str[i]-'0'] == 0) {
TrieSize++;
memset(&Node[TrieSize], 0, sizeof(Node[0]));
Node[idx].link[str[i]-'0'] = TrieSize;
}
idx = Node[idx].link[str[i]-'0'];
}
Node[idx].n ++;
}
int max, maxNum;
void findAns(int now) {
if(Node[now].n != 0) {
if(max == Node[now].n) {
maxNum += Node[now].n;
} else if(max < Node[now].n){
max = Node[now].n;
maxNum = max;
}
}
int i;
for(i = 0; i < 10; i++) {
if(Node[now].link[i] != 0) {
findAns(Node[now].link[i]);
}
}
}
int cmp(const void *i, const void *j) {
return *(int *)i - *(int *)j;
}
int main() {
int n, A[5];
char buf[20];
while(scanf("%d", &n) == 1 && n) {
TrieSize = 0;
memset(&Node[0], 0, sizeof(Node[0]));
while(n--) {
scanf("%d %d %d %d %d", &A[0], &A[1], &A[2], &A[3], &A[4]);
qsort(A, 5, sizeof(int), cmp);
sprintf(buf, "%d%d%d%d%d", A[0], A[1], A[2], A[3], A[4]);
insertTrie(buf);
}
max = 0, maxNum = 0;
findAns(0);
printf("%d\n", maxNum);
}
return 0;
}


台長: Morris
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