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<algorithm>
using namespace std;

static const in N = 100;

int main(){
  int j,i,l,n,p[N+1],m[N+1][N+1];
  scanf("%d",&n);

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

  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] = (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;
#define int long long
int n,dp[111][111],p[111];

int rec(int i,int j){
  int Min=2*1e9;
  for(int k=0;k<i-1;k++){
    Min=min(Min,dp[j+1][j+k+1]+dp[j+k+2][j+i]+p[j]*p[j+k+1]*p[j+i]);
  }
  return Min;
}

signed main(){
  cin>>n;
  cin>>p[0]>>p[1];
  for(int i=2;i<=n;i++){
    cin>>p[i]>>p[i];
  }
  for(int i=0;i<n;i++){
    dp[i][i]=0;
    if(i)dp[i][i+1]=p[i-1]*p[i]*p[i+1];
  }

  for(int i=3;i<=n;i++){
    for(int j=0;j+i<=n;j++){
      dp[j+1][j+i]=rec(i,j);
    }
  }
  cout<<dp[1][n]<<endl;
  return 0;
}

C++: #include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<iostream>
using namespace std;

#define N_MAX 100
#define C_MAX 100
#define R_MAX 100

int p[N_MAX+1];
int m[R_MAX+1][C_MAX+1];


int chain_multiplication(int n)
{
    for (int i = 0; i < n; i++) {
        m[i][i] = 0;
    }
    for (int l = 1; l < n; l++) {
        for (int i = 0; i < n - l; i++) {
            int j = i + l;
            m[i][j] = 100000000;
            for ( int k = i ; k < j; k++) {
                int a = m[i][k] + m[k+1][j] + p[i] * p[k+1] * p[j+1];
//                printf("i %d k %d j %d a %d min %d\n", i, k, j, a, m[i][j]);
                if (m[i][j] > a) {
                    m[i][j] = a;
                }
            }
//            printf("m[%d][%d] = %d\n", i, j, m[i][j]);
        }
    }
    return m[0][n-1];
}

int main() {
    int n;

    cin >> n;

    for (int i = 0; i < n; i++) {
        cin >> p[i];
        cin >> p[i+1];
    }
    cout << chain_multiplication(n) << endl;
        
    return 0;
}

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

}

C++: #include<bits/stdc++.h>
#define rep(i, n) for (int i=0; i<(n); i++)
#define ll long long
using namespace std;

const ll INF=1e18;

int main() {
  int n; cin>>n;
  vector<ll> p(n+1);
  rep(i, n) cin>>p[i]>>p[i+1];

  vector<vector<ll>> dp(n+1, vector<ll>(n+1, INF));
  rep(i, n+1) dp[i][i]=0;

  for (int l=1; l<n; l++) {
    for (int i=0; i<n-l; i++) {
      int j=i+l;
      for (int k=i; k<j; k++) {
        ll cost=p[i]*p[k+1]*p[j+1];
        dp[i][j]=min(dp[i][j], dp[i][k]+dp[k+1][j]+cost);
      }
    }
  }
  cout<<dp[0][n-1]<<endl;
}

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<iostream>
#include<algorithm>
using namespace std;

int matrixChainMultiplication(int **m,int *p,int n);

const int Sentinel = 2000000;

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

	m = new int*[n+1]; for(int i=0;i<=n;i++) m[i] = new int[n+1];

	cout<<matrixChainMultiplication(m,p,n)<<endl;

	delete [] p;
	for(int i=0;i<=n;i++) delete [] m[i]; delete [] m;
}

int matrixChainMultiplication(int **m,int *p,int n){
	for(int i=1;i<=n;i++) m[i][i] = 0;

	int minimum = 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] = Sentinel;
			for(int k=i;k<j;k++){
				m[i][j] = min(m[i][k]+m[k+1][j]+p[i-1]*p[k]*p[j],m[i][j]);
				minimum = (minimum,m[i][j]);
			}
		}
	}
	return minimum;
}