Go: package main

/*
連鎖行列積
*/

import (
	"bufio"
	"bytes"
	"fmt"
	"log"
	"math"
	"os"
	"strconv"
	"strings"
)

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

type mem *[][]int

func main() {
	scanner := makeScanner(1024)
	n := eGetInt(scanner)
	p := make([]int, n+1)
	for i := 0; i < n; i++ {
		rowcol := eGetInts(scanner)
		p[i] = rowcol[0]
		p[i+1] = rowcol[1]
	}
	m := make([][]int, n)
	for i := 0; i < n; i++ {
		m[i] = make([]int, n)
	}
	// 初期値の格納
	for i := 0; i < n; i++ {
		for j := i; j < n; j++ {
			if i == j {
				m[i][j] = 0 //  同じ行列へのコストは当然0
			} else {
				m[i][j] = math.MaxInt64
			}
		}
	}

	// num : 行列の数. num == 1の場合は初期値0を格納ずみ
	for num := 2; num <= n; num++ {
		// s : スタート行列番号
		for s := 0; s+num <= n; s++ {
			// t : 終了行列番号
			t := s + num - 1
			// k : 仕切
			for k := s; k < t; k++ {
				m[s][t] = min(m[s][t], m[s][k]+m[k+1][t]+p[s]*p[k+1]*p[t+1])
			}
		}
	}
	fmt.Println(m[0][n-1])
}

////////////////////////////////////////////////////////////////////////////////
// ライブラリ
////////////////////////////////////////////////////////////////////////////////
func makeScanner(maxByte int) *bufio.Scanner {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Buffer(make([]uint8, 0, 8192), maxByte)
	return scanner
}
func makeWordScanner() *bufio.Scanner {
	scanner := makeScanner(8192)
	scanner.Split(bufio.ScanWords)
	return scanner
}
func eGetLine(r *bufio.Scanner) string {
	if r.Scan() {
		return r.Text()
	}
	err := r.Err()
	if err != nil {
		log.Fatal(err)
	}
	// EOF
	return ""
}
func eGetInt(r *bufio.Scanner) int {
	line := eGetLine(r)
	return eAtoi(line)
}
func eGetFields(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Fields(line)
}
func eGetInts(r *bufio.Scanner) []int {
	fields := eGetFields(r)
	ints := make([]int, len(fields))
	for i := 0; i < len(ints); i++ {
		ints[i] = eAtoi(fields[i])
	}
	return ints
}
func eGetChars(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Split(line, "")
}
func eAtoi(s string) int {
	n, err := strconv.Atoi(s)
	if err != nil {
		log.Fatal(err)
	}
	return n
}

type ints []int

func (s ints) String() string {
	var buf bytes.Buffer
	buf.WriteString("[")
	sep := ""
	for _, v := range s {
		buf.WriteString(fmt.Sprintf("%s%d", sep, v))
		sep = ", "
	}
	buf.WriteString("]")
	return buf.String()
}

func reverse(a ints) ints {
	r := make(ints, len(a))
	for i := 0; i < len(a); i++ {
		r[i] = a[len(a)-1-i]
	}
	return r
}
func max(a ints) (int, bool) {
	if len(a) == 0 {
		return 0, false
	}
	m := a[0]
	for _, e := range a {
		if e > m {
			m = e
		}
	}
	return m, true
}

// func min(a []int) int {
// 	m := a[0]
// 	for _, v := range a {
// 		if v < m {
// 			m = v
// 		}
// 	}
// 	return m
// }

func sum(a ints) int {
	if len(a) == 0 {
		return 0
	}
	sum := 0
	for _, e := range a {
		sum += e
	}
	return sum
}
func find(n int, a ints) int {
	for i, v := range a {
		if n == v {
			return i
		}
	}
	return -1
}

C++: #include<iostream>
#include<cstdio>
#include<string>
#include<algorithm>

#define INF 100000001

using namespace std;

int DP[101][101];
int *p;

int rec(int r, int c){
    int Min = INF;
    int num = c-r;

    for(int i=0; i<num; i++){
        Min = min(Min, DP[r][r+i] + DP[r+i+1][c] + p[r-1]*p[r+i]*p[c]);
    }

    return Min;
}

int main(){
    int N;
    cin >> N;

    for(int i=1; i<=N; i++) DP[i][i] = 0;

    p = (int *)malloc(sizeof(int)* (N+1));

    cin >> p[0];
    cin >> p[1];

    int bb;
    for(int i=2; i<=N; i++){
        cin >> bb;
        cin >> p[i];
    }

    for(int i=1; i<N; i++) DP[i][i+1] = p[i-1]*p[i]*p[i+1];

    for(int j=0; j<=N-3; j++){
        for(int i=3+j; i<=N; i++){
            DP[i-2-j][i] = rec(i-2-j, i);
        }
    }

    cout << DP[1][N] << endl;

    return 0;
}

C++: #include<stdio.h>
#include<algorithm>
using namespace std;

static const int N = 100;

int main(){
  int n, p[N + 1], m[N + 1][N + 1];
  cin >> n;l <= n; l++){
  for( int i = 1; i <= n; i++){
    cin >> p[i - 1] >> p[i];
  }
  
  for( int i = 1; i <= n; i++) m[i][i] = 0;
  for( int l = 2; l <= n; l++){
    for( int i = 1; i <= n - 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;
  
  return 0;
}

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

static const int N=100;

int main(){
    int n, p[N+1],m[N+1][N+1];
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>p[i-1]>>p[i];
    }
    
    for (int i=1;i<=n;i++) m[i][i]=0;
    for(int l=2;l<=n;l++){
        for(int 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;
    return 0;
}

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

int main(){
  int n,p[101],m[101][101];
  cin>>n;
  for(int i=1;i<=n;i++){
    cin>>p[i-1]>>p[i];
  }
  for(int i=1;i<=n;i++) m[i][i]=0;
  for(int l=2;l<=n-l+1;l++){
    for(int 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;
  return 0;
}

C++: // matrix chain multiplication
#include<iostream>
#define MAX 2000000
void MatrixChainMultiplication(int*,int);
int **F;
int main(){
  int n,i,j,*matrix;
  std::cin >> n;
  matrix = new int[n+1];
  F = new int*[n+1];
  for(i=1; i<=n; i++) F[i] = new int[n+1];
  for(i=0; i<n; i++){
    std::cin >> matrix[i] >> (i != n - 1 ? j : matrix[i+1]);
  }
  MatrixChainMultiplication(matrix,n);
  std::cout << F[1][n] << "\n";
  return 0;
}

void MatrixChainMultiplication(int* p,int n){
  int i,j,k,l,q;
  for(i=1; i<=n; i++) F[i][i] = 0;
  for(l=2; l<=n; l++){
    for(i=1; i<=n-l+1; i++){
      j = i + l - 1;
      F[i][j] = MAX;
      for(k=i; k<=j-1; k++){
        q = F[i][k] + F[k+1][j] + p[i-1] * p[k] * p[j];
        F[i][j] = (F[i][j] < q ? F[i][j] : q);
      }
    }
  }
}

C++: #include<stdio.h>
#define N 100
#define INF 9999999

int m[N][N], p[N], n;

void matrixChainOrder(){

  int i, j, k, l, q;

  for(i = 1 ; i <= n ; i++){
    m[i][i] = 0;
  }
  for(l = 2 ; l <= n ; l++){
    for(i = 1 ; i <= n - l + 1 ; i++){
      j = i + l -1;
      m[i][j] = INF;
      for(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  a, i;

  scanf("%d", &n);
  for(i = 0 ; i < n ; i++){
    scanf("%d%d", &p[i], &p[i+1]);
  }

  matrixChainOrder();
  
  printf("%d\n", m[1][n]);  

  return 0;
}

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

static const int N = 100;

int main(){
	int n, p[N+1], m[N+1][N+1];
	cin >> n;
	for (int i=1; i<=n; i++){
		cin >> p[i-1] >> p[i];
	}

	for (int i=1; i<=n; i++) m[i][i] = 0;
	for (int l=2; l <= n; l++){
		for (int 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;

	return 0;
}

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

const int INF=(1<<21);

int n;
int dp[105][105], p[105];

void matrixChainMultiplication(){
    for(int i=1; i<=n; i++) dp[i][i]=0;

    for(int l=2; l<=n; l++){
        for(int i=1; i<=n-l+1; i++){
            int j=i+l-1;
            dp[i][j]=INF;
            for(int k=i; k<=j-1; k++){
                dp[i][j]=min(dp[i][j], dp[i][k]+dp[k+1][j]+p[i-1]*p[k]*p[j]);
            }
        }
    }
}

int main(void){
    cin >> n;
    for(int i=0; i<n; i++){
        int a,b; cin >> a >> b;
        if(i==0){
            p[0]=a, p[1]=b;
        }
        else p[i+1]=b;
    }

    matrixChainMultiplication();

    cout << dp[1][n] << endl;
}