Codeforces 356A

这题有个注意的地方，就是对集合边读边删除的时候，应该尤为注意。。   my_set.erase(it++)

#include <iostream>

#include <cstring>
#include <set>

using namespace std;

int color[300005];

int main(){
    int n, m;
    while (cin >> n >> m) {
        set<int> my_set;
        for (int i = 1; i <= n; i++) {
            my_set.insert(i);
        }
        memset(color, 0, sizeof(color));

        for (int i = 0; i < m; i++) {
            int l, r, x;
            cin >> l >> r >> x;
            set<int>::iterator it;
            it = my_set.lower_bound(l);
            while (it != my_set.end()) {
                if ((*it) > r) {
                    break;
                }
                if ((*it) == x) {
                    it++;
                    continue;
                }
                color[(*it)] = x;
                my_set.erase(it++);
                /* it++; */
            }
        }
        for (int i = 1; i <= n; i++) {
            cout << color[i] << (i==n ? '\n' : ' ');
        }
    }

    return 0;
}