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 <algorithm>
#include <iostream>
#include <list>

struct Matrix
{
    int r;
    int c;
};
int Multiple(std::list<Matrix>::iterator Left)
{
    std::list<Matrix>::iterator Right = Left; Right++;
    int Count = Left->r * Right->c * Left->c;
    Right->r = Left->r;
    return Count;
}
bool CompareR(const Matrix& Left, const Matrix& Right)
{
    return Left.r < Right.r;
}
bool CompareC(const Matrix& Left, const Matrix& Right)
{
    return Left.c < Right.c;
}
int Mcm(const std::list<Matrix>& AList)
{
    std::list<Matrix> List = AList;
    const std::list<Matrix>::iterator MinR = std::min_element(List.begin(), List.end(), CompareR);
    const std::list<Matrix>::iterator MinC = std::min_element(List.begin(), List.end(), CompareC);
    int Count = 0;
    for(std::list<Matrix>::iterator It = MinC; It != List.begin(); It){
        --It;
        Count += Multiple(It);
        It = List.erase(It);
    }
    for(std::list<Matrix>::iterator It = MinR; It != --List.end(); It){
        Count += Multiple(It);
        It = List.erase(It);
    }
    Count += Multiple(List.begin());
    return Count;
}

int main()
{
    std::list<Matrix> List;
    int n;
    std::cin >> n;
    for(int i = 0; i < n; ++i){
        Matrix m;
        std::cin >> m.r >> m.c;
        List.push_back(m);
    }
    
    std::cout << Mcm(List) << std::endl;
    return 0;
}

C++: /*
    Problem 46
    https://onlinejudge.u-aizu.ac.jp/problems/ALDS1_10_B
*/
#include <bits/stdc++.h>
using namespace std;
/* typedef */
typedef long long ll;
typedef pair<int, int> pii;
/* constant */
const int INF = 1 << 30;
const ll LINF = 1LL << 50;
const int NIL = -1;
const int MAX = 10000;
const int mod = 1000000007;
const double pi = 3.141592653589;
/* class */
class Matrix {
public:
    int r, c;
    Matrix () {}
    Matrix (int r, int c) : r(r), c(c) {}
};
/* global variables */
/* function */
/* main */
int main(){
    int n;
    cin >> n;
    vector<Matrix> M(n, Matrix());
    for (int i = 0; i < n; i++) {
        int r, c;
        cin >> r >> c;
        Matrix m = Matrix(r, c);
        M[i] = m;
    }

    // init dp
    vector<vector<int>> dp(n, vector<int>(n));
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            if (i == j) dp[i][j] = 0;
            else dp[i][j] = INF;
    // calc
    // ex) M0 * M1 * M2
    // w=1 , M0*M1, M1*M2
    // w=2 , M0*M1*M2 = min{M0*(M1*M2),  (M0*M1)*M2)}
    //   | 0 | 1 | 2
    // 0 | 0 |w=1|w=2
    // 1 |   | 0 |w=1
    // 2 |   |   | 0
    for (int w = 1; w < n; w++) {  // w+1個の連続したMatrixの積, w個の選択肢
        for (int i = 0; i < n-w; i++) {  // start位置 Mi * Mi+1 * ... * Mi+w
            int j = i + w;  // end位置 Mi * Mi+1 * ... * Mj
            for (int k = i; k < j; k++) {
                int cost = M[i].r * M[k].c * M[j].c;
                dp[i][j] = min(dp[i][j], dp[i][k] + dp[k+1][j] + cost);
            }
        }
    }

    cout << dp[0][n-1] << '\n';
}

C++: #include <stdio.h>
#include <algorithm>

using namespace std;


int main(){
	int n,minimum,tmp;
	scanf("%d",&n);
	int table[n][n];
	int data[n][2];

	for(int i=0;i<n;i++){
		for(int k=0;k<n;k++)table[i][k] = 0;
		scanf("%d %d",&data[i][0],&data[i][1]);
	}

	for(int i=n-2;i>=0;i--){
		for(int k=0;k<=i;k++){
			if(i==n-2){
				table[n-i-1][k] = data[k][0]*data[k][1]*data[k+1][1];
		}else{
				minimum = 2147483647;
				for(int p=0;p<=n-i-2;p++){
					tmp=(table[p][k]+table[n-i-p-2][k+p+1])+(data[k][0]*data[k+p][1]*data[k+n-i-1][1]);
					minimum = min(minimum,tmp);
				}
				table[n-i-1][k] = minimum;
			}
		}
	}

	printf("%d\n",table[n-1][0]);

    return 0;
}

C++: #include<bits/stdc++.h>
#define N 100
using namespace std;

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;
}