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ac了,主要是qsort的判定条件写的太简单, 只要加上在len相等情况下处理weight就okIn Reply To:这份代码我在zju上ac了, 可这里判定是wa Posted by:navyakula at 2006-02-03 08:12:04
> 最坏的情况是我在侥幸在zju上过关了,否则, 还会有什么原因呢?
> #include <stdio.h>
> #include <memory.h>
> #include <stdlib.h>
> #define MAXN 5001
> struct Stick {
> int l, w;
> }a[MAXN];
> int n;
> int cmp( const void * a, const void * b)
> {
> return ((const Stick *)a)->l - ((const Stick *)b)->l;
> }
> int d[MAXN];
> // longest increasing subsequence
> int lis()
> {
> int seg = 0;
> int max, sec;
> for(int i=1; i<=n; ++i)
> {
> max = -1;
> for(int j=0; j<seg; ++j) if( a[i].w >= d[j] && max < d[j] ) { max = d[j]; sec = j; }
> if( max == -1 ) d[seg++] = a[i].w;
> else d[sec] = a[i].w;
> }
> return seg;
> }
>
> int main()
> {
> int t; scanf("%d", &t);
> while( t-- )
> {
> scanf("%d", &n);
> for(int i=1; i<=n; ++i) scanf("%d%d", &a[i].l, &a[i].w);
> qsort( &a[1], n, sizeof(Stick), cmp );
> printf( "%d\n", lis() );
> }
> return 0;
> }
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