LightOJ - 1016 Brush (II)（贪心）

题目大意：给你一把宽度为w的刷子，每次刷的时候只能横着刷，问需要刷几次才能把所有的点给刷完

解题思路：能并在一起刷，就并在一起刷

#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
const int N = 50010;

int y[N];
int cnt, n, m, cas = 1;
void init() {
    scanf("%d%d", &n, &m);

    int x;
    for (int i = 0; i < n; i++) 
        scanf("%d%d", &x, &y[i]);
    sort(y, y + n);
    cnt = 0;
    for (int i = 1; i < n; i++)
        if (y[i] != y[i - 1])
            y[++cnt] = y[i];
}

int find(int num) {
    int l = 0, r = cnt;
    while (l <= r) {
        int mid = (l + r) >> 1;
        if (y[mid] <= num) l = mid + 1;
        else r = mid - 1;
    }
    return r + 1;
}

void solve() {
    int tmp = y[0], ans = 0, pos;

    do {
        ans++;
        pos = find(tmp + m);
        tmp = y[pos];
    }while (pos <= cnt);
    printf("Case %d: %d\n", cas++, ans);
}

int main() {
    int test;
    scanf("%d", &test);
    while (test--) {
        init();
        solve();
    }
    return 0;
}