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 <vector>
#include <algorithm>

typedef struct {
	int row;
	int column;
}Matrix;

const int MaxN = 100;

int dp[MaxN + 1][MaxN + 1];

int calc(std::vector<Matrix>& m, int a, int b)
{
	int ans;

	if (b - a == 0) {
		return 0;
	}
	if (b - a == 1) {
		if (dp[a][b] != 0) {
			return dp[a][b];
		}
		else {
			ans = m[a - 1].row*m[b - 1].column*m[a - 1].column;
			dp[a][b] = ans;
			return ans;
		}
	}
	else {
		if (dp[a][b] != 0) {
			return dp[a][b];
		}

		ans = calc(m, a, a) + calc(m, a + 1, b) + m[a - 1].row*m[b - 1].column*m[a - 1].column;
		for (int i = 1; i < b - a; i++) {
			int temp;
			temp = calc(m, a, a + i) + calc(m, a + i + 1, b) + m[a - 1].row*m[b - 1].column*m[a + i - 1].column;
			if (temp < ans) {
				ans = temp;
			}
		}
		dp[a][b] = ans;
	}

	return ans;
}

int main()
{
	int n;
	Matrix temp;
	std::vector<Matrix> m;
	
	std::cin >> n;

	for (int i = 0; i < n; i++) {
		std::cin >> temp.row >> temp.column;
		m.push_back(temp);
	}

	std::cout << calc(m, 1, m.size()) << std::endl;

	return 0;
}

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

long long INF = 10000000000;

int main(){
    //input
    long long n;
    cin >> n;
    long long r[n+1], c[n+1];
    long long i;
    for(i = 1; i <= n; i++){
        cin >> r[i] >> c[i];
    }

    //calc
    long long dp[n+1][n+1];
    for(i = 1; i <= n; i++){
        dp[i][i] = 0;
    }
    long long j,d;
    for(d = 1; d <= n-1; d++){
        for(i = 1; i <= n-d; i++){
            dp[i][i+d] = INF;
            for(j = 0; j < d; j++){
                dp[i][i+d] = min(dp[i][i+d], dp[i][i+j] + r[i]*c[i+j]*c[i+d] + dp[i+j+1][i+d]);
            }
        }
    }

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

C++: #include <iostream>
#define INF 100001

using namespace std;

int main(){
  int n;
  cin >> n;
  int dp[n+1][n+1],p[n+1];
  cin >> p[0] >> p[1];
  for(int i=2;i<=n;i++){
    int t; cin >> t;
    cin >> p[i];
  }
  for(int i=1;i<=n;i++) dp[i][i]=0;
  for(int l=2;l<=n;l++){
    for(int i=1;i<=n-l+1;i++){
      int j=i+l-1;
      dp[i][j]=INF;
      for(int k=i;k<=j-1;k++)
        dp[i][j]=min(dp[i][j], dp[i][k]+dp[k+1][j]+p[i-1]*p[k]*p[j]);
    }
  }
  cout << dp[1][n] << endl;
}