CodeForces 430A Points and Segments (easy)（构造）题解

题意：之前愣是没看懂题意...就是给你n个点的坐标xi，然后还规定了Li，Ri，要求给每个点染色，每一组L，R内的点红色和黑色的个数不能相差大于1个，问你能不能染成功，不能输出-1，能就按照输入的顺序输出颜色

思路：我会说我根本没想到怎么做吗？显然只要交替染色相差就不会大于1

代码：

#include<set>
#include<map>
#include<stack>
#include<cmath>
#include<queue>
#include<vector>
#include<string>
#include<cstdio>
#include<cstring>
#include<sstream>
#include<iostream>
#include<algorithm>
typedef long long ll;
using namespace std;
const int maxn = 100 + 10;
const int MOD = 1e9 + 7;
const int INF = 0x3f3f3f3f;
struct node{
    int id, col, i;
    bool operator < (const node x) const{
        return id < x.id;
    }
}a[maxn];
bool cmp(node x, node y){
    return x.i < y.i;
}
int main(){
    int n, m, c;
    scanf("%d%d", &n, &m);
    for(int i = 1; i <= n; i++) scanf("%d", &a[i].id), a[i].i = i;
    for(int i = 1; i <= m; i++) scanf("%d%d", &c, &c);
    sort(a + 1, a + n + 1);
    for(int i = 1; i <= n; i++) a[i].col = i & 1;
    sort(a + 1, a + n + 1, cmp);
    for(int i = 1; i <= n; i++){
        if(i != 1) printf(" ");
        printf("%d", a[i].col);
    }
    printf("
");
    return 0;
}