被区间表示整了一个晚上。
和POJ那题一样,离散化,插点
#include <cstdio>
#include <stack>
#include <set>
#include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <functional>
#include <cstring>
#include <algorithm>
#include <cctype>
#include <ctime>
#include <cstdlib>
#include <fstream>
#include <string>
#include <sstream>
#include <map>
#include <cmath>
#define LL long long
#define SZ(x) (int)x.size()
#define Lowbit(x) ((x) & (-x))
#define MP(a, b) make_pair(a, b)
#define MS(arr, num) memset(arr, num, sizeof(arr))
#define PB push_back
#define F first
#define S second
#define ROP freopen("input.txt", "r", stdin);
#define MID(a, b) (a + ((b - a) >> 1))
#define LC rt << 1, l, mid
#define RC rt << 1|1, mid + 1, r
#define LRT rt << 1
#define RRT rt << 1|1
#define BitCount(x) __builtin_popcount(x)
const double PI = acos(-1.0);
const int INF = 0x3f3f3f3f;
using namespace std;
const int MAXN = 10000 + 5;
const int MOD = 20071027;
typedef pair<int, int> pii;
typedef vector<int>::iterator viti;
typedef vector<pii>::iterator vitii;
struct POINT
{
int l, r;
char ch;
}pit[MAXN];
int col[MAXN << 4], cnt, vis[MAXN << 1];
vector<int> num;
void PushDown(int rt)
{
if (col[rt] != -1)
{
col[LRT] = col[RRT] = col[rt];
col[rt] = -1;
}
}
void Query(int rt, int l, int r)
{
if (col[rt] != -1)
{
if (col[rt] == 0)
fill(vis + l, vis + r + 1, 1);
return;
}
if (l == r) return;
int mid = MID(l, r);
Query(LC); Query(RC);
}
void Update(int rt, int l, int r, int L, int R, int val)
{
if (L <= l && r <= R)
{
col[rt] = val;
return;
}
if (col[rt] == val) return;
PushDown(rt);
int mid = MID(l, r);
if (L <= mid) Update(LC, L, R, val);
if (R > mid) Update(RC, L, R, val);
}
int main()
{
//ROP;
int n, i, j;
while (~scanf("%d", &n))
{
MS(vis, 0);
num.clear();
char ch[2];
for (i = 0; i < n; i++)
{
scanf("%d%d%s", &pit[i].l, &pit[i].r, ch);
pit[i].ch = ch[0];
num.PB(pit[i].l); num.PB(pit[i].r);
}
num.PB(0); num.PB(1e9);
sort(num.begin(), num.end());
int m = unique(num.begin(), num.end()) - num.begin();
num.resize(m);
for (i = 0; i < m - 1; i++)
if (num[i] + 1 != num[i + 1]) num.PB(num[i] + 1);
sort(num.begin(), num.end());
int curSize = SZ(num);
for (i = 0; i < n; i++)
{
int l = lower_bound(num.begin(), num.end(), pit[i].l) - num.begin();
int r = lower_bound(num.begin(), num.end(), pit[i].r) - num.begin();
if (pit[i].ch == 'w') Update(1, 0, curSize - 1, l + 1, r, 0);
else Update(1, 0, curSize - 1, l + 1, r, 1);
}
Query(1, 0, curSize - 1);
int ans = 1, L = 0, R = 1;
for (i = 1; i < curSize; i++)
{
if (vis[i])
{
for (j = i + 1; j < curSize && vis[j]; j++);
int cnt = num[j - 1] - num[i - 1];
if (cnt > ans)
{
ans = cnt;
L = i - 1, R = j - 1;
}
i = j - 1;
}
}
printf("%d %d\n", num[L], num[R]);
}
return 0;
}