Language: C++

#include <iostream>
#include <vector>
//#include <string>
#include <algorithm>
//#include <math.h>
//#include <queue>
//#include <stack>
//#include <iomanip>

// sometimes used
//#include <set>
//#include <map>
//#include <numeric>
//#include <list>
//#include <deque>
//#include <unordered_map>

typedef long long LL;
//typedef long double LD;
using namespace std;
 
//#define MOD 1000000007
//#define MAX 100100
//#define NIL -1
//#define INFTY 1000000000000000000

int main(){
    LL r;
    LL c;
    LL k;
    cin >> r >> c >> k;
    vector<vector<LL>> v(r, vector<LL>(c, 0));
    LL tmp_r;
    LL tmp_c;
    LL tmp_v;
    for(LL i=0; i<k; i++){
        cin >> tmp_r >> tmp_c >> tmp_v;
        tmp_r--;
        tmp_c--;
        v[tmp_r][tmp_c]=tmp_v;
    }
    vector<vector<vector<int>>> dp(r, vector<vector<int>>(c,vector<int>(4,0)));

    for(int i=0; i<r; i++){
        for(int j=0; j<c; j++){
            /*
            for(LL l=0; l<4; l++){
                if(i!=0){
                    dp[i][j][0]=max(dp[i][j][0], dp[i-1][j][l]);
                }
            }
            if(v[i][j]!=0){
                dp[i][j][1]=dp[i][j][0]+v[i][j];
            }
            */
            /*
            for(LL l=0; l<4; l++){
                if(j!=0){
                    dp[i][j][l]=max(dp[i][j][l], dp[i][j-1][l]);
                    if(v[i][j]!=0 && l>=1){
                        dp[i][j][l]=max(dp[i][j][l], dp[i][j-1][l-1]+v[i][j]);
                    }
                }
            }
            */
        }
    }

    LL max_ans=0;
    for(LL i=0; i<4; i++){
        max_ans=max(max_ans, dp[r-1][c-1][i]);
    }

    cout << max_ans << endl;

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:71:20: error: no matching function for call to 'max(LL&, __gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type&)'
   71 |         max_ans=max(max_ans, dp[r-1][c-1][i]);
      |                 ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:71:20: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'})
   71 |         max_ans=max(max_ans, dp[r-1][c-1][i]);
      |                 ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:4:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:71:20: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   71 |         max_ans=max(max_ans, dp[r-1][c-1][i]);
      |                 ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~