YXC20142024 @ 2024-12-13 19:03:04
P1047 [NOIP2005 普及组] 校门外的树咋做?
by zjz11223 @ 2024-12-13 19:37:20
#include <bits/stdc++.h>
using namespace std;
int l, m; //l颗树,m个区域
bool b[10001];
int main()
{ //初始化:
//归"false":
memset(b, 1, sizeof(b));
//输入:
scanf("%d%d", &l, &m);
//计算答案:
for(int i = 1; i <= m; ++i) {
int u, v; //从第u点开始到第v点结束,这一段是地铁
scanf("%d%d", &u, &v);
for(int j = u; j <= v; ++j) {
b[j] = 0; //这里被建成地铁了
}
}
//输出:
int ans = 0;
for(int i = 1; i <= l; ++i) {
if(b[i]) {
//没被移走
++ans;
}
}
printf("%d\n", ans);
return 0;
}
by cqfcbb2015 @ 2024-12-13 19:40:58
这题我采用的是桶数组,你可以用STL::MAP,根据题目意思来画出铁路
by zjz11223 @ 2024-12-13 19:43:45
答: 用模拟, 很简单
by _xguagua_Firefly_ @ 2024-12-19 07:55:05
用数据结构维护颜色段均摊,然后数颜色就好了(
by liuyc0120 @ 2024-12-19 22:27:08
难难难!!!
by l_sbh_rx @ 2024-12-19 23:04:57
@_xguaguaFirefly老司机[手动狗头]
by _xguagua_Firefly_ @ 2024-12-20 07:37:29
@l_sbh_rx
:)