Language: C++

//#include <bits/stdc++.h>
#include "bits/stdc++.h"
using namespace std;
typedef long long ll;


#include "boost/multiprecision/cpp_int.hpp"
#include "boost/multiprecision/cpp_dec_float.hpp"
namespace mp = boost::multiprecision;
typedef mp::cpp_int LL;
typedef mp::number<mp::cpp_dec_float<1024>> DD;// 仮数部が1024ビットの浮動小数点数型(TLEしたら小さくする)

 
typedef long double dd;
#define i_7 (ll)(1E9+7)
//#define i_7 998244353
#define i_5 i_7-2
ll mod(ll a){
    ll c=a%i_7;
    if(c>=0)return c;
    return c+i_7;
}
typedef pair<ll,ll> l_l;
typedef pair<dd,dd> d_d;
ll inf=(ll)1E16;
#define rep(i,l,r) for(ll i=l;i<=r;i++)
#define rrep(i,r,l) for(ll i=r;i>=l;i--)
#define pb push_back
ll max(ll a,ll b){if(a<b)return b;else return a;}
ll min(ll a,ll b){if(a>b)return b;else return a;}
void Max(ll &pos,ll val){pos=max(pos,val);}//Max(dp[n],dp[n-1]);
void Min(ll &pos,ll val){pos=min(pos,val);}
void Add(ll &pos,ll val){pos=mod(pos+val);}
dd EPS=1E-12;
#define fastio ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define fi first
#define se second
#define endl "\n"  //インタラクティブで消す！！！！！！！！！！！！！！！！！！！！！
#define SORT(v) sort(v.begin(),v.end())
#define ERASE(v) v.erase(unique(v.begin(),v.end()),v.end())
#define POSL(v,x) (lower_bound(v.begin(),v.end(),x)-v.begin())
#define POSU(v,x) (upper_bound(v.begin(),v.end(),x)-v.begin())
template<class T,class S>
inline bool chmax(T &a, S b) {
    if(a < b) {
        a = b;
        return true;
    }
    return false;
}
template<class T,class S>
inline bool chmin(T &a, S b) {
    if(a > b) {
        a = b;
        return true;
    }
    return false;
}

void mod_print(ll k){
    ll P=50000;
    rep(y,1,P){
        ll x=mod(y*k);
        
        if(abs(x)<=P||x+P>=i_7){
            if(x+P>=i_7){
                x-=i_7;
            }
            cout<<x<<"/"<<y<<endl;
            //cout<<setprecision(5)<<(dd)x/(dd)y;
            return;
        }
    }
    cout<<"nun"<<endl;
}
#define all(c) c.begin(),c.end()
typedef vector<ll> vl;
//////////////////////////


int main(){fastio
    ll r,c,k;cin>>r>>c>>K;
    vector<l_l>v[r+1];
    rep(zz,1,K){
        ll a;cin>>a;
        l_l b;cin>>b.fi>>b.se;
        v[a].pb(b);
    }
    rep(i,1,r)sort(all(v[i]));
    ll dp[r+1][c+1];
    rep(i,0,r)rep(j,0,c){
        dp[i][j]=-inf;
        if(i==0||j==0)dp[i][j]=0;
    }
    
    rep(i,1,r){
        ll vs=v[i].size();
        
        if(vs>=1)rep(j,0,vs-1){
            chmax(dp[i][v[i][j].fi],dp[i-1][v[i][j].fi]+v[i][j].se);
        }
        if(vs>=2){
            rep(j,0,vs-1){
                rep(k,j+1,vs-1){
                    chmax(dp[i][v[i][k].fi],dp[i-1][v[i][j].fi]+v[i][j].se+v[i][k].se);
                }
            }
        }
        rep(k,3,3){
            if(vs<k)continue;
            rep(STA,0,vs-k){
                ll sum=0;
                priority_queue<ll,vector<ll>,greater<ll>>q;
                rep(j,STA,vs-1){
                    q.push(v[i][j].se);
                    sum+=v[i][j].se;
                    if(j-STA>=k){
                        ll tt=q.top();q.pop();
                        sum-=tt;
                    }
                    chmax(dp[i][v[i][j].fi],dp[i-1][v[i][STA].fi]+sum);
                }
            }
        }
        rep(j,0,c)chmax(dp[i][j],dp[i-1][j]);
        rep(j,1,c)chmax(dp[i][j],dp[i][j-1]);
    }
    /*
    rep(i,0,r){
        rep(j,0,c)cout<<dp[i][j]<<" ";cout<<endl;
    }*/
    cout<<dp[r][c]<<endl;
    
    return 0;
}


Compiler output:
a.cc:7:10: fatal error: boost/multiprecision/cpp_int.hpp: No such file or directory
    7 | #include "boost/multiprecision/cpp_int.hpp"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.