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

int dp[110][110];

int main() {
  int n;
  cin >> n;
  vector<int> r(n), c(n);
  for (int i = 0; i < n; i++) {
    cin >> r[i] >> c[i];
  }
  for (int i = 0; i < 110; i++) {
    for (int j = 0; j < 110; j++) {
      if (i == j) {
        dp[i][j] = 0;
      }
      else {
        dp[i][j] = 100000000;
      }
    }
  }
  for (int l = 2; l <= n; l++) {
    for (int i = 1; i <= n - l + 1; i++) {
      int j = i + l - 1;
      for (int k = i; k <= j - 1; k++) {
        dp[i][j] = min(dp[i][j], dp[i][k] + dp[k + 1][j] + r[i - 1]*c[k - 1]*c[j - 1]);
      }
    }
  }
  cout << dp[1][n] << endl;
  return 0;
}

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

const int N = 100;

int main(){
  int n;
  cin >> n;
  int p[N+1], m[N+1][N+1];
  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] = numeric_limits<int>::infinity();
      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<stdio.h>
#include<algorithm>

using namespace std;
int n;
int m[101][101]; 
int s[101][101];
int q;
//連鎖行列積
int mco(int p[]) {
	for (int i = 1; i < n + 1; i++) {
		m[i][i] = 0; 
	}
	for (int l = 2; l < n + 1; l++) {
		for (int i = 1; i < n - l + 2; i++) {
			int j = i + l - 1;
			m[i][j] = 2000000;
			for (int k = i; k < j ; k++) {
				q = m[i][k] + m[k + 1][j] + p[i - 1] * p[k] * p[j];
				m[i][j] = min(q, m[i][j]);
				
			}
		}

	}return m[1][n];
	

}
int main() {
	cin >> n;
	int p[101];
	for (int i = 0; i < n; i++) {
		cin >> p[i] >> p[i + 1];
	}
	cout << mco(p) << endl;
	return 0;
	
	
}

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

int min(int x, int y)
{
	return x>y ? y : x;
}

int main()
{
	int n; std::cin >> n;
	
	int* r = new int[n];
	int* c = new int[n];
	for (int i=0; i<n; i++) std::cin >> r[i] >> c[i];
	
	long long int** DP = new long long int*[n];
	for (int i=0; i<n; i++) DP[i] = new long long int[n];
	
	for (int d=0; d<n; d++) {
		for (int i=0; i<n-d; i++) {
			if (d==0) DP[i][i] = 0;
			else {
				long long int opt = LLONG_MAX;
				for (int j=0; j<d; j++) {
					long long int tmp = r[i] * c[i+j] * c[i+d] + DP[i][i+j] + DP[i+j+1][i+d];
					if (opt > tmp) opt = tmp;
				}
				DP[i][i+d] = opt;
			}
		}
	}
	
	std::cout << DP[0][n-1] << std::endl;
	
	for (int i=0; i<n; i++) delete[] DP[i];
	delete[] DP;
	
	return 0;
}

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

using namespace std;

int main() {
	int n;
	cin >> n;
	int ma[2][101];
	for (int i = 0; i < n; ++i) {
		cin >> ma[0][i] >> ma[1][i];
	}

	long counts[101][101];
	long k1, k2;
	long mins1;
	for (int i = 0; i < n; ++i) {
		for (int j = 0; j < n; ++j) {
			if (i <= j) {
				counts[i][j] = 0;
			}
		}
	}

	for (int l = 0; l < n; ++l) {
		for (int i = 0; i < n-l; ++i) {
		
			int j = i +l+1;
			mins1 = 100000000;
			for (int k = i; k < j; ++k) {
				k1 = counts[i][k] + counts[k+1][j] + ma[0][i] * ma[1][k] * ma[1][j];
				if (mins1 > k1) {
					mins1 = k1;
				}
			}
			counts[i][j] = mins1;
			
		}
	}
	cout << counts[0][n - 1] << endl;
	return 0;
}

C++: #include<stdio.h>
#include<algorithm>
#define MAX 101
using namespace std;

typedef struct Matrix {
    int r, c;
} Matrix;

Matrix M[MAX];

int Matrix_Chain_Multiplication(int n) {
    int m[MAX][MAX];
    
    if (n==1) return 0;

    for (int i=1; i<=n; i++) {
        m[i][i] = 0;
    }
    
    for (int i=1; i<n; i++) {
        m[i][i+1] = M[i].r*M[i].c*M[i+1].c;
    }

    for (int k=2; k<n; k++) {
        for (int i=1; i+k<=n; i++) {
            m[i][i+k] = (1 << 21);
            for (int j=i; j<i+k; j++) {
                m[i][i+k] = min(m[i][i+k], m[i][j]+m[j+1][i+k]+M[i].r*M[j].c*M[i+k].c);
            }
        }
    }

    return m[1][n];
}

int main() {
    int n;
    
    scanf("%d", &n);
    for (int i=1; i<=n; i++) scanf("%d %d", &M[i].r, &M[i].c);
    
    int minimum = Matrix_Chain_Multiplication(n);

    printf("%d\n", minimum);

    return 0;
}

C++: #include <iostream>
#include <sstream>
#include <cstdio>
#include <stdlib.h>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
int n,array[101],m[101][101];
void matrixchainorder(){
  int i,j,l,k;
  for(i=0;i<n+1;i++)
    for(j=0;j<n+1;j++)
      m[i][j]=2000000000;
  for(i=0;i<n+1;i++)m[i][i]=0;
  for(l=2;l<=n;l++){
    for(i=1;i<=n-l+1;i++){
      j=i+l-1;
      for(k=i;k<=j-1;k++){
	m[i][j]=min(m[i][j],m[i][k]+m[k+1][j]+array[i-1]*array[k]*array[j]);
      }
    }
  }
}
int main(){
  cin>>n;
  for(int i=0;i<n;i++)cin>>array[i]>>array[i+1];
  matrixchainorder();
  cout<<m[1][n]<<endl;

  return 0;
}