Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < n; i++)
#define all(v) v.begin(), v.end()
#define ms(a, b) memset(a, b, sizeof(a))

int r, c, k;
long long val[3001][3001];
long long dp[3001][3001][4];
int main(){
    cin >> r >> c >> k;
    ms(val, 0);ms(dp, 0);

    rep(i, k){
        int R, C, V;
        cin >> R >> C >> V;
        val[R - 1][C - 1] = V;
    }

    if(val[0][0] > 0)dp[0][0][1] = val[0][0];

    rep(i, r){
        rep(j, c){
            // 横に移動
            long long temp = 0;
            rep(m, 3){
                temp = max(dp[i][j + 1][m + 1], dp[i][j][m] + val[i][j + 1]);
                temp = max(temp, dp[i][j][m + 1]);
                dp[i][j + 1][m + 1] = temp;
            }
            //縦に移動
            
            long long temp1 = 0;
            rep(m, 4) temp1 = max(temp1, dp[i][j][m]);
            dp[i + 1][j][0] = max(temp1, dp[i + 1][j][0]);
            dp[i + 1][j][1] = max(temp1 + val[i + 1][j], dp[i + 1][j][1]);
            
        }
    }
    
    int res = 0;
    rep(i, 4) res = max(res, dp[r - 1][c - 1][i]);
    cout << res << endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:42:24: error: no matching function for call to 'max(int&, long long int&)'
   42 |     rep(i, 4) res = max(res, dp[r - 1][c - 1][i]);
      |                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 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:42:24: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   42 |     rep(i, 4) res = max(res, 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:
/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:42:24: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   42 |     rep(i, 4) res = max(res, dp[r - 1][c - 1][i]);
      |                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~