Submission #1627558

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Source Code Expand

// 基本テンプレート

#include <iostream>
#include <iomanip>
#include <cstdio>
#include <string>
#include <cstring>
#include <deque>
#include <list>
#include <queue>
#include <stack>
#include <vector>
#include <utility>
#include <algorithm>
#include <map>
#include <set>
#include <complex>
#include <cmath>
#include <limits>
#include <cfloat>
#include <climits>
#include <ctime>
#include <cassert>
#include <numeric>
#include <functional>
using namespace std;

#define rep(i,a,n) for(int (i)=(a); (i)<(n); (i)++)
#define repq(i,a,n) for(int (i)=(a); (i)<=(n); (i)++)
#define repr(i,a,n) for(int (i)=(a); (i)>=(n); (i)--)
#define int long long int

template<typename T> void chmax(T &a, T b) {a = max(a, b);}
template<typename T> void chmin(T &a, T b) {a = min(a, b);}
template<typename T> void chadd(T &a, T b) {a = a + b;}

typedef pair<int, int> pii;
typedef long long ll;

int dx[] = {0, 0, 1, -1};
int dy[] = {1, -1, 0, 0};
constexpr ll INF = 1001001001001001LL;
constexpr ll MOD = 1000000007LL;

int N, M;
int l[100010], r[100010], s[100010];
int pre[100010], suf[100010];

signed main() {
    cin >> N >> M;
    rep(i,0,N) cin >> l[i] >> r[i] >> s[i];
    rep(i,0,N) {
        pre[ r[i] ] += s[i];
        suf[ l[i] ] += s[i];
    }

    repq(i,1,M) {
        pre[i] += pre[i-1];
    }
    repr(i,M,1) {
        suf[i] += suf[i+1];
    }

    int ans = 0;
    rep(i,0,M) {
        chmax(ans, pre[i] + suf[i+2]);
    }
    cout << ans << endl;
    return 0;
}

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