Escape wind it ~

Today the wind and changed the code. .
Tucao for a long time. .
What the macro definitions are removed. .
To be honest I am a little bit reluctant to me that only a little

#include<bits/stdc++.h>
using namespace std;
const int N = 110;
int a[N];

int main() {
    int n, h, m;
    scanf("%d%d%d", &n, &h, &m);
    for(int i = 1; i <= n; ++i) {
        a[i]=h;
    }
    for(int i = 1; i <= m; ++i) {
        int x, y, z;
        scanf("%d%d%d", &x, &y, &z);
        for(int j = x; j <= y; ++j) {
            a[j] = min(a[j], z);
        }
    }
    int ans = 0;
    for(int i = 1; i <= n; ++i) {
        ans += a[i] * a[i];
    }
    printf("%d\n", ans);
    return 0;
}