Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 500001), 500000)
	return scanner
}

func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}

func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}

func main() {
	fp := os.Stdin
	if len(os.Args) > 1 {
		fp, _ = os.Open(os.Args[1])
	}

	scanner := getScanner(fp)
	writer := bufio.NewWriter(os.Stdout)

	n := getNextInt(scanner)
	mm := make([]int, n+1)
	dp := make([][]int, n+1)
	for i := 0; i <= n; i++ {
		dp[i] = make([]int, n+1)
	}
	for i := 0; i < n; i++ {
		mm[i] = getNextInt(scanner)
		mm[i+1] = getNextInt(scanner)
	}

	for l := 2; l <= n; l++ {
		for i := 1; i <= n-l+1; i++ {
			j := i + l - 1
			for k := i; k <= j-1; k++ {
				d := dp[i][k] + dp[k+1][j] + mm[i-1]*mm[k]*mm[j]
				if dp[i][j] == 0 || dp[i][j] > d {
					dp[i][j] = d
				}
			}
		}
	}

	fmt.Fprintln(writer, dp[1][n])

	writer.Flush()
}

C++: #include <iostream>
#include <cstdio>
#include <map>
#define MAX_NUM 100
#define INFTY 1000000000
#define NIL -1

using namespace std;

//think easy make easy

int n;//num of input


pair<int,int> MatrixChain[MAX_NUM+1];
map<pair<int,int>,int> map;

int calc(int s,int e){//s~eの連鎖行列積の最少計算回数を出力
	int min_time  = INFTY;
	int min_tmp;

	if(map[s,e] != NIL)
		return map[s,e];

	if(s == e){
		return 0;
	}
	for(int i=s;i<e;i++){
		min_tmp = calc(s,i) + calc(i+1,e) 
			+MatrixChain[s].first*MatrixChain[i].second*MatrixChain[e].second;
		if(min_tmp < min_time)
			min_time = min_tmp;
	}
	map[s,e] = min_time;//メモ
	return min_time;
}

int main(){
	scanf("%d",&n);
	int r,c;//row,column

	for(int i=0;i<n;i++){
		scanf("%d %d",&r,&c);
		MatrixChain[i] = pair<int,int>(r,c);//i:1~n-1
	}
	for(int i=0;i<n;i++){
		for(int j=i;j<n;j++){
			map[i][j] = NIL;
		}
	}

	cout <<calc(0,n-1) <<endl;

	return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<climits>
using namespace std;

int m[105][105];
int plen;
//function matrix chain order
void matrixco(int p[]){
  int n,j,q;
  n=plen-1;
  for(int i=1;i<=n;i++){
    m[i][i]=0;
  }

  for(int l=2;l<=n;l++){
    for(int i=0;i<=n-l+1;i++){
      j=i+l-1; 
      m[i][j]=INT_MAX;   
      for(int k=i;k<=j-1;k++){
	q=m[i][k]+m[k+1][j]+p[i-1]*p[k]*p[j];
	if(q<m[i][j]){
	  m[i][j]=q;
	}
      }
    }
  }
}

int main(){
  int n;
  int p[105];
  int r,c;
  //load n
  cin >>n;

  plen=n+1;

  for(int i=0;i<n;i++){
    //load r,c
    scanf("%d %d",&r,&c);

    if(i!=n-1) p[i]=r;
    else{
      p[i]=r;
      p[i+1]=c;
    }
  }

  matrixco(p);

  cout <<m[1][n]<<endl;
  return 0;
}

C++: #include <iostream>
#include <vector>
using namespace std;

typedef long long ll;
const ll inf = 1<<30;

int main(void){cin.tie(0);ios::sync_with_stdio(false);

    int nb; cin >> nb;
    vector<ll> dim(nb);
    int trash;
    for(auto& a:dim) cin >> a >> trash;
    dim.push_back(trash);
    
    vector<vector<ll>> cost( nb, vector<ll>(nb, inf) );
    for (int i=0; i<nb; ++i){
        cost[i][i] = 0;
    }
    
    for (int k=1; k<nb; ++k){
        for (int i=0; i+k<nb; ++i){
            for (int j=0; j<i+k; ++j){
                cost[i][i+k] = min(
                    cost[i][i+k],
                    cost[i][j] + cost[j+1][i+k] + dim[i]*dim[j+1]*dim[i+k+1]);
            }
        }
    }

    cout<<cost[0][nb-1] <<"\n";
}

C++: #include <bits/stdc++.h>
using namespace std;

int main(void){
    int i,n;
    cin >> n;
    int p[n+1];
    int **m = new int*[n+1];
    for(i=1; i<=n; i++){
        m[i] = new int[n+1];
    }
    for(i=1; i<=n; i++) cin >> p[i-1] >> p[i];
    for(i=1;i<=n;i++) m[i][i] = 0;
    for(int l=2; l<=n; l++){
        for(i=1; i<=n-l+1; i++){
            int j = i + l - 1;
            m[i][j] = (1<<21);
            for ( int k=i; k<=j-1; k++)
                m[i][j] = min(m[i][j], m[i][k] + m[k+1][j] + p[i-1] * p[k] * p[j]);
        }
    }
    cout << m[1][n] << endl;
    for(int i=1; i<n+1; i++){
        delete[] m[i];
        m[i] = 0;
    }
    delete[] m;
    m = 0;
    return 0;
}

C++: #include <iostream>
#include <vector>
using namespace std;

struct TMatrixInfo
{
	int RowSize;
	int ColSize;
	TMatrixInfo(int ARowSize, int AColSize)
	{
		RowSize = ARowSize;
		ColSize = AColSize;
	}
	TMatrixInfo()
	{
	}
};

vector<vector<int> > TableResize(int n)
{
	vector<vector<int> > CostCountTable;
	CostCountTable.resize(n);
	for(int i = 0; i < n; i++){
		CostCountTable[i].resize(n);
	}
	return CostCountTable;
}

int Cost(TMatrixInfo A, TMatrixInfo B)
{
	return A.RowSize * A.ColSize * B.ColSize;
}

TMatrixInfo M(int Index1, int Index2, const vector<TMatrixInfo>& MatrixChain)
{
	TMatrixInfo Matrix(MatrixChain[Index1].RowSize, MatrixChain[Index2].ColSize);
	return Matrix;
}

int GetCellValue(const vector<vector<int> >& CostCountTable, const vector<TMatrixInfo>& MatrixChain, int Row, int Col)
{
	if(Col == Row){
		return 0;
	}else{
		int CurrentMinCost;
		for(int i = Row; i < Col; i++){
			int CurrentCost = CostCountTable[Row][i] + Cost(M(Row, i, MatrixChain), M(i+1, Col, MatrixChain)) + CostCountTable[i+1][Col];
			if(i == Row || CurrentCost < CurrentMinCost){
				CurrentMinCost = CurrentCost;
			}
		}
		return CurrentMinCost;
	}
}

void CalcSlantingLine(vector<vector<int> >& CostCountTable, const vector<TMatrixInfo>& MatrixChain, int Col)
{
	int n = MatrixChain.size();
	for(int i = 0; i < n-Col; i++){
		CostCountTable[i][Col+i] = GetCellValue(CostCountTable, MatrixChain, i, Col+i);
	}
}

int MinCalcCost(const vector<TMatrixInfo>& MatrixChain)
{
	int n = MatrixChain.size();
	vector<vector<int> > CostCountTable = TableResize(n);
	for(int i = 0; i < n; i++){
		CalcSlantingLine(CostCountTable, MatrixChain, i);
	}
	return CostCountTable[0][n-1];
}

int main()
{
	int n;
	cin >> n;
	vector<TMatrixInfo> MatrixChain(n);
	for(int i = 0; i < n; i++){
		cin >> MatrixChain[i].RowSize;
		cin >> MatrixChain[i].ColSize;
	}
	cout << MinCalcCost(MatrixChain) << endl;
	return 0;
}

C++: #define _USE_MATH_DEFIMES
#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <cctype>
#include <climits>
#include <clocale>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <deque>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <regex>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <tuple>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

const int MOD = 1'000'000'007;
const int INF = 1'000'000'000; //1e9
const int NIL = -1;
const long long LINF = 1'000'000'000'000'000'000; // 1e18
const long double EPS = 1E-10;

template<class T, class S> inline bool chmax(T &a, const S &b){
    if(a < b){
        a = b; return true;
    }
    return false;
}
template<class T, class S> inline bool chmin(T &a, const S &b){
    if(b < a){
        a = b; return true;
    }
    return false;
}








int main(){
    int n; std::cin >> n;
    std::vector<int> r(n), c(n);
    for(int i(0); i < n; ++i) std::cin >> r[i] >> c[i];
    //dp[i][j] := iからjまでの計算に必要な回数
    std::vector<std::vector<int>> dp(n, std::vector<int>(n, 0));
    for(int d(1); d < n; ++d){
        for(int i(0), i_len(n - d); i < i_len; ++i){
            int j(i + d);
            dp[i][j] = INF;
            for(int k(i); k < j; ++k){
                chmin(dp[i][j], dp[i][k] + dp[k+1][j] + r[i]*c[k]*c[j]);
            }
        }
    }
    std::cout << dp[0][n-1] << std::endl;
    return 0;
}