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>
#define N 100
using namespace std;

int main() {
  int n, p[N + 1], m[N + 1][N + 1], i, j, k, l;
  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] = (1 << 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 <climits>
#include <cmath>
#include <algorithm>
#include <utility>
#include <vector>
#include <string>

#define MAX 200000
#define INFTY 1<<30

using namespace std;

static const int N = 1000;

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++)//???????????° 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 <stdio.h>
#include <limits.h>
#include <math.h>
#define INF INT_MAX

int n,p[101],m[101][101];

void matrixChainOrder(){
  int i,j,k,l,q;
  for(i=0;i<n;i++)m[i][i]=0;
  for(l=1;l<n;l++)
    for(i=0;i<n-l;i++){
      j=i+l;
      m[i][j]=INF;
      for(k=i;k<j;k++){
	q=m[i][k]+m[k+1][j]+p[i]*p[k+1]*p[j+1];
	m[i][j]=fmin(m[i][j],q);
      }
    }
}

int main(){
  int i;
  scanf("%d",&n);
  for(i=0;i<2*n;i++)scanf("%d",&p[i]);
  matrixChainOrder();
  printf("%d\n",m[0][n-1]);
  return 0;
}

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

template<typename T, typename U> void dmin(T &x, U y) { if(x > y) x = y; }

const int MAX_N = 100;
const int INF = 1001001001;

int main() {
  int n, r, c;
  int rc[MAX_N][2];
  cin >> n;
  for (int i=0; i<n; i++) {
    cin >> r >> c;
    rc[i][0] = r; rc[i][1] = c;
  }

  int dp[MAX_N][MAX_N];
  for (int i=0; i<n; i++) {
    for (int j=0; j<n; j++) {
      dp[i][j] = INF;
    }
    dp[i][i] = 0;
  }

  for (int l=2; l<=n; l++) {
    for (int i=0; i+l-1<n; i++) {
      for (int j=1; j<l; j++) {
        dmin(dp[i][i+l-1], dp[i][i+j-1] + rc[i][0]*rc[i+j-1][1]*rc[i+l-1][1] + dp[i+j][i+l-1]);
      }
    }
  }

  cout << dp[0][n-1] << endl;
  return 0;
}

C++: #include<bits/stdc++.h>
#define INF (1e9)
#define N 105
using namespace std;
int n,r[N],c[N],dp[N][N];

void matrixChainOrder(){
  for(int l=2;l<=n;l++){
    for(int i=0;i<=n-l;i++){
      int j=i+l-1;
      dp[i][j]=INF;
      for(int k=i;k<j;k++)
	dp[i][j]=min(dp[i][j],dp[i][k]+dp[k+1][j]+r[i]*c[k]*c[j]);
    }
  }
}

int main(){
  cin>>n;
  for(int i=0;i<n;i++)
    cin>>r[i]>>c[i];
  matrixChainOrder();
  cout<<dp[0][n-1]<<endl;
  return 0;
}

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

using namespace std;

int main() {
	int n;
	cin >> n;
	int m[101];
	int M[101][101];
	for (int i = 1; i <= n; i++) {
		cin >> m[i-1] >> m[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] = 100000000000000000;
			for (int k = i; k < j; k++) {
				M[i][j] = min(M[i][j], M[i][k] + M[k + 1][j] + m[i - 1] * m[k] * m[j]);
			}
		}
	}
	cout << M[1][n] << endl;
	return 0;
}

C++: #include <iostream>
#include <vector>

int main()
{
  int n;
  std::cin >> n;
  std::vector<std::pair<int, int>> data;
  for (int i = 0; i < n; i++){
    int l , r;
    std::cin>> l >> r;
    data.push_back(std::make_pair(l, r));
  }

  std::vector<std::vector<int>> dp(n+1, std::vector<int>(n+1, 0));
  for (int w = 2; w <= n; w++){
    for (int l = 0; l < n; l++){
      int r = l+w;
      if(r>n)continue;
      dp[l][r] = 100000000;
      for (int mid = l+1; mid < r; mid++){
        dp[l][r] = std::min(dp[l][r], dp[l][mid] + dp[mid][r] + data[l].first*data[mid].first*data[r-1].second);
      }
    }
  }
  std::cout << dp[0][n] << std::endl;
}