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];

  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;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++: const int MAX_SIZE = 101;

int dp[MAX_SIZE][MAX_SIZE];

int solve(int p[], int begin,int end) {
	if (dp[begin][end] != -1)return dp[begin][end];
	if (begin >= end - 1)return 0;
	int res = -1;
	for (int i = begin + 1; i < end; i++) {
		int temp = solve(p, begin, i) + solve(p, i, end) + (p[begin] * p[i] * p[end]);
		if (res != -1) {
			res = min(temp, res);
		}
		else {
			res = temp;
		}
	}
	return dp[begin][end] = res;
}

int main() {
	int N;
	int p[MAX_SIZE + 1];

	cin >> N;
	for (int i = 0; i < N; i++) {
		cin >> p[i] >> p[i + 1];
	}

	for (int i = 0; i < MAX_SIZE; i++) {
		for (int j = 0; j < MAX_SIZE; j++) {
			dp[i][j] = -1;
		}
	}

	cout << solve(p, 0, N) << endl;
	return 0;
}

C++: #include <stdio.h>

int main() {
	int n, i, j, k, l, p[101], m[101][101];
	
	scanf("%d", &n);
	for ( i = 1; i <= n; i++) {
		scanf("%d", &p[i - 1]);
		scanf("%d", &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++) {
			int j = i + l - 1;
			m[i][j] = ( 1 << 21);
			for ( k = i; k <= j - 1; k++) {
				if ( m[i][j] < m[i][k] + m[k + 1][j] + p[i - 1]*p[k]*p[j]) {
					m[i][j] = m[i][j];
				} else {
					m[i][j] = m[i][k] + m[k + 1][j] + p[i - 1]*p[k]*p[j];
				}
			}
		}
	}
	
	printf("%d\n", m[1][n]);
	
	return 0;
}

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

static const int N = 101;

int main(){
    //配列mにはn以下の行列連鎖積の最小回数が格納される
    int n,p[N],m[N][N];
    cin >> n;
    for(int i=1;i<=n;i++)
        cin >> p[i-1] >> p[i];
    //初期化
    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++){
            //i,j,kは行列の範囲を表す
            //i<=k<j
            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++: //?????????B 
#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;

static const int N = 100;

int main()
{
    int n,p[N+1],m[N+1][N+1],i,l,j,k;
    cin >> n;
    for(i=1;i<=n;i++)
    {
        cin >> 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] = (i << 21);
        for(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 <cstdio>
#include <algorithm>
#include <vector>
#include <utility>
#include <queue>
#include <climits>
using namespace std;

int mcm(vector<int>& p)
{
    vector<vector<int> > m(p.size() - 1, vector<int>(p.size() - 1));
    for (int i = 0; i < m.size(); i++) {
        m[i][i] = 0;
    }
/*
 * l == number of targets
 * i == left most of targets
 */
    for (int l = 2; l <= m.size(); l++) {
        for (int i = 0; i < m.size() - l + 1; i++) {
            int j = i + l - 1;
            m[i][j] = INT_MAX;
            for (int k = i; k < j; k++) {
                m[i][j] =
                    min(m[i][j],
                        m[i][k] + m[k + 1][j] + p[i] * p[k + 1] * p[j + 1]);
            }
        }
    }
    return m[0][m.size() - 1];
}

int main()
{
    int n, x, y;
    cin >> n;
    vector<int> p(n + 1);
    for (int i = i; i < n + 1; i++) {
        cin >> p.at(i - 1) >> p.at(i);
    }
    cout << mcm(p) << endl;
    return 0;
}

C++: #include<iostream>
#include<string>
#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];
  }

  // M[i][j] i=j ならばその掛け算の回数は0回
  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;
}