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 int N=100;

int main()
{
   int n,p[N+1],m[N+1][N+1];  //??´?????????????¬¬i??????????????????p[i-1]*p[i]??????m[i][j]???????????????i??°j??????????????????????§£
    cin>>n;
    for(int i=0;i<n;i++)
        cin>>p[i]>>p[i+1];

    //init
    for(int i=1;i<=n;i++) m[i][i]=0;
    for(int l=2;l<=n;l++) //?????????2????????????????§???????????????´????????°?????????n
    {
        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;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<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 n;
int num[101][101];
int p[101];

void matrixChainMultiplication(){
  for(int l=2;l<=n;l++){
    for(int i=1;i<=n-l+1;i++){
      int j=i+l-1;
      num[i][j]=INT_MAX;
      for(int k=i;k<=j-1;k++)
	num[i][j]=min(num[i][j],num[i][k]+num[k+1][j]+p[i-1]*p[k]*p[j]);
    }   
  }
  cout<<num[1][n]<<endl;
}

int main(){
  cin>>n;
  for(int i=1;i<=n;i++) cin>>p[i-1]>>p[i];
 
  for(int i=1;i<=n;i++)num[i][i]==0;
  
  matrixChainMultiplication();
      
  return 0;
}

C++: #include<iostream>
#include<cstdio>
#define INT_MAX 100000000
using namespace std;
int sentinel;
int Mi[1000][1000];

void calc(int p[]);

int main(){
  int p[1000],a,b;
  scanf("%d",&sentinel);
  for(int i=0;i<sentinel;i++){
    scanf("%d %d",&a,&b);
    p[i] = a;
    if(i == sentinel-1)p[i+1] = b;
  }

  sentinel = sentinel+1;
  calc(p);

  printf("%d\n",Mi[1][sentinel-1]);
  return 0;
}

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

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

#define INF 1e9

int main(void){
  int n, temp;
  cin >> n;

  vector<int> c(n+1);
  cin >> c[0] >> c[1];
  for(int i=2; i<n+1; i++)
    cin >> temp >> c[i];

  vector< vector<int> > dp(n, vector<int>(n+1, INF));
  for(int i=0; i<n; i++)
    dp[i][i+1] = 0;
  
  for(int i=2; i<n+1; i++)
    for(int j=0; j<n; j++)
      for(int k=1; k<i; k++)
	if(j+i < n+1)
	  dp[j][j+i] = min(dp[j][j+i],
			   dp[j][j+k]+dp[j+k][j+i]+c[j]*c[j+k]*c[j+i]);
  
  cout << dp[0][n] << endl;
  
  return 0;
}

C++: // ALDS1_10_B
#include <bits/stdc++.h>
#define endl "\n"
#define rep(i,n) for(int i=0;i<int(n);i++)
#define SZ(x) ((int)(x).size())
#define all(x) (x).begin(),(x).end()
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> ipair;
typedef pair<ll,ll> lpair;
template <class T>ostream &operator<<(ostream &o,const vector<T>&v) //vectorの中身を見る
{o<<"{";for(int i=0;i<(int)v.size();i++)o<<(i>0?", ":"")<<v[i];o<<"}";return o;}

vector<int> r(110);
vector<int> c(110);
int inf=pow(10,9);
vector<vector<int>> dp(110,vector<int>(110,inf));
int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(12);
    
    int n;
    cin>>n;
    rep(i,n) cin>>r[i]>>c[i];
    rep(i,n) dp[i][i]=0; //長さ1の計算量
    for(int L=2;L<=n;L++){ //長さ 短い長さからdpテーブルを埋めていく
        for(int i=0;i<=n-2;i++){ //始点
            int j=i+L-1; //終点
            if(n-1<j) break; //範囲オーバー 
            for(int k=i;k<=j-1;k++){ //i~k,k+1~jで区切る。区切ったブロックの長さは互いにL以下なので、すでに互いのブロックの最小コストはdpテーブルにある。
                dp[i][j]=min(dp[i][j],dp[i][k]+dp[k+1][j]+r[i]*r[k+1]*c[j]);
            }
        }
    }
    cout<<dp[0][n-1]<<endl;
    return 0;
}