#include
<
iostream
>
using
namespace
std;
struct
arr{
int
x,y;
}a[
100001
];
int
N,M;
int
f[
30005
];
int
cmp(
const
void
*
no1,
const
void
*
no2){
return
(
*
(arr
*
)no1).x
-
(
*
(arr
*
)no2).x;
}
int
main()
{
scanf(
"
%d
"
,
&
N);
M
=
0
;
for
(
int
i
=
1
;i
<=
N;
++
i){
scanf(
"
%d%d
"
,
&
a[i].x,
&
a[i].y);
if
(M
<
a[i].x) M
=
a[i].x;
if
(M
<
a[i].y) M
=
a[i].y;
}
qsort(a
+
1
,N,
sizeof
(arr),cmp);
f[M
+
1
]
=
0
;
for
(
int
i
=
M;i
>=
1
;
--
i){
f[i]
=
f[i
+
1
];
while
(i
==
a[N].x){
if
(f[i]
<
f[a[N].y
+
1
]
+
1
)
f[i]
=
f[a[N].y
+
1
]
+
1
;
N
--
;
}
}
printf(
"
%d\n
"
,f[
1
]);
return
0
;
}
magio:
program ural1203;
const
maxt=30000;
var
s,f:array[0..maxt]of word;
n,i:longint;
ts,te:word;
function max(a,b:word):word;
begin
if a>b then max:=a else max:=b;
end;
begin
read(n);
for i:=1 to n do begin
read(ts,te);
s[te]:=max(s[te],ts);
end;
for i:=2 to maxt do
if s[i]=0 then
f[i]:=f[i-1]
else
f[i]:=max(f[s[i]-1]+1,f[i-1]);
writeln(f[maxt]);
end.
posted on 2009-06-19 15:50
xfstart07 阅读(269)
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