Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

//util
var sc = bufio.NewScanner(os.Stdin)

func nextStr() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	sc.Scan()
	i, e := strconv.Atoi(sc.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func printList(list []int) {
	buf := bufio.NewWriter(os.Stdout)
	for _, v := range list {
		buf.Write([]byte(fmt.Sprintf(" %d", v)))
	}
	buf.Write([]byte("\n"))
	buf.Flush()
}

//solve
//単純な場合
func matrixChainMultiplication() {
	//行列が1つだけのとき
	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
			//kまでで区切る
			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])
			}
		}
	}
}

func max(a, b int) int {
	if a > b {
		return a
	} else {
		return b
	}
}

func min(a, b int) int {
	if a > b {
		return b
	} else {
		return a
	}
}

const MAX = 100

var n int
var p [MAX + 1]int

//m[i][j]: Mi * Mi+1 * ... * Mjを計算するときに必要なスカラー乗算の最小回数
var m [MAX + 1][MAX + 1]int

func main() {
	sc.Split(bufio.ScanWords)
	n = nextInt()
	for i := 1; i <= n; i++ {

		p[i-1] = nextInt() //行数
		p[i] = nextInt()   //列数
	}

	matrixChainMultiplication()
	fmt.Println(m[1][n])
}

C++: #include<iostream>
#include<algorithm>
using namespace std;
#define INF (1 << 21)
int main(){

  //-------データの入力------------
  int n;
  cin >> n;
  int row[n];
  int column[n];
  for(int i = 0; i < n; i++){
    cin >> row[i] >> column[i];
  }
  //-----------------------------

  //[始点][終点（始点+幅）]の最小コスト
  int dp[n+1][n+1];

  //INFで初期化
  for(int i = 0; i < n; i++){
    for(int j = 0; j < n; j++){
      dp[i][j] = INF;
    }
  }

  //幅0はコスト0
  //dp[i][i+0] = 0
  for(int i = 0; i < n; i++){
    dp[i][i] = 0;
  }

  //幅:j = 0 から探索開始
  for(int j = 0; j < n; j++){
    //始点: i
    for(int i = 0; i < n; i++){
      //仕切りを置く位置: k
      // (M_0, M_1, M_2, M_3) | (M_4, M_5)
      for(int k = i + 1; k <= i + j; k++){
        //現在のdp[i][i+j]より小さければ更新
        dp[i][i+j] = min(dp[i][i+j], dp[i][k-1] + dp[k][i+j] + row[i] * column[k-1] * column[i+j]);
      }
    }
  }
  /*
  for(int i = 0; i < n; i++){
    for(int j = 0; j < n; j++){
      cout << dp[i][j] << " ";
    }
    cout << endl;
  }
  */
  //始点０、幅n-1の最小コスト=> n個の行列の連鎖の計算に最低限必要な乗算の回数　を出力
  cout << dp[0][n-1] << 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];

  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 <stdio.h>
//#include <string.h>

using namespace std;

struct Matrix{
    int row;
    int col;
    int total;
};

Matrix mts[100][100];
int n;

int main()
{
    scanf("%d",&n);
    for(int i=0; i<n; ++i){
        int r,c;
        scanf("%d %d", &r, &c);
        mts[0][i].row = r;
        mts[0][i].col = c;
        mts[0][i].total = 0;
    }

    for(int i=1; i<n; ++i){
        for(int j=0; j<n-i; ++j){
            int min = 0xfffffff;
            mts[i][j].row = mts[i-1][j].row;
            mts[i][j].col = mts[0][i+j].col;
            for(int k=0; k<i; ++k){
                int tmp = mts[k][j].total + mts[i-k-1][k+j+1].total + mts[k][j].row * mts[i-k-1][k+j+1].row * mts[i-k-1][k+j+1].col;
                min = min < tmp ? min : tmp;
            }
            mts[i][j].total = min;
        }
    }

    cout << mts[n-1][0].total << endl;

    return 0;
}

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

using namespace std;


int main()
{
    int n;
    int p[101];
    int m[101][101];

    cin >> n;

    for (int i = 0; i <= n; i++)
        for (int j = 0; j <= n; j++)
            m[i][j] = 0;

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

    for (int len = 1; (n - 1) - len >= 0; len++) {
        for (int i = 0; i <= (n - 1) - len; i++) {
            m[i][i + len] = INT_MAX / 3;
            for (int j = i; j < i + len; j++) {
                m[i][i + len] = min(m[i][i + len], m[i][j] + m[j + 1][i + len] + p[i] * p[j + 1] * p[i + len + 1]);
            }
        }
    }

    cout << m[0][n - 1] << endl;

    return 0;
}