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 <bits/stdc++.h>
using namespace std;
#define Rep(i, n) for (int i = 0; i < (int)(n); i++)
#define BitRep(i, n) for (int i = 0; i < (int)(1 << n); i++)
#define Sum(vec) accumulate(vec.begin(), vec.end(), 0)
#define Sort(vec) sort(vec.begin(), vec.end())
#define Reverse(vec) reverse(vec.begin(), vec.end())
#define Next_permutation(vec) next_permutation(vec.begin(), vec.end())

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++) {
        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 <bits/stdc++.h>
using namespace std;

#define endl '\n'

typedef long long ll;

const ll oo = 0x3f3f3f3f3f3f3f3f;

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);

	int n;
	cin >> n;

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

	vector<vector<ll>> dp(n + 1, vector<ll>(n + 1, oo));

	for(int l = 0; l < 2; ++l)
		for(int i = 0; i + l <= n; ++i)
			dp[i][i + l] = 0;

	for(int l = 2; l <= n; ++l)
		for(int i = 0; i + l <= n; ++i)
			for(int k = i + 1; k < i + l; ++k)
				dp[i][i + l] = min(dp[i][i + l],
								   dp[i][k] + dp[k][i + l] + (ll) v[k] * v[i] * v[i + l]);

	cout << dp[0][n] << endl;

    return 0;
}

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

using namespace std;

static const int N = 100;

void mcm() {
    int n = 4;
    int p[n+1], m[n+1][n+1];

    int sample[][4] = {{5, 4}, {4, 6}, {6, 2}, {2, 7}};

    int cnt = 0;
    for (int i = 1; i <= n; i++) {
        p[i -1] = sample[cnt][0];
        p[i] = sample[cnt][1];
        cnt++;
    }
    cout << "Values of p: " << endl;
    for (int i = 0; i <=n; i++) cout << p[i] << " ";
    cout << endl;

    //diagonal part is always 0
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <=n; j++) {
            m[i][j] = 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; k++) {
                m[i][j] = min(m[i][j], m[i][k] + m[k+1][j] + p[i-1] * p[k] * p[j]);
            }
        }
    }

    cout << "Result table: " << endl;
    for (int i = 1; i <=n; i++) {
        for (int j = 1; j <=n; j++) {
            cout << m[i][j] << " ";
        }
        cout << endl;
    }
}


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];
    }
    //diagonal part is always 0
    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; 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;
    //mcm();
    return 0;
}

C++: #include <iostream>
#include <algorithm>
#define rep(i,n) for(int i=0; i<(int)(n); i++)

using namespace std;
typedef long long LL;
const int INF=10000000;
int r[110], c[110];
int dp[110][110];

int CalcMin(int L, int R){
  if(L==R) return dp[L][R]=0;
  int res=INF;
  rep(M,R-L){
    int left, right;
    if(dp[L][L+M]!=-1) left=dp[L][L+M];
    else left=CalcMin(L,L+M);
    if(dp[L+M+1][R]!=-1) right=dp[L+M+1][R];
    else right=CalcMin(L+M+1,R);
    res=min(res,left+right+r[L]*c[L+M]*c[R]);
  }
  return dp[L][R]=res;
}

int main(){
  int n;
  cin >> n;
  rep(i,n) cin >> r[i] >> c[i];
  rep(i,n){
    rep(j,n) dp[i][j]=-1;
  }
  cout << CalcMin(0,n-1) << endl;

  return 0;
}

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

const int MAX = 105;
const int INF = 1<<29;
struct Matrix
{
    int r, c;
};
Matrix M[MAX];
int dp[MAX][MAX], n;

int DP(int i, int j)
{
    int &ans = dp[i][j];
    if(ans!=-1) return ans;
    ans = INF;
    for(int k=i; k<j; k++)
    {
        ans = min(ans, DP(i, k)+DP(k+1, j)+M[i].r*M[k].c*M[j].c);
    }
    return ans;
}
int main()
{
    scanf("%d", &n);
    memset(dp, -1, sizeof(dp));
    for(int i=1; i<=n; i++)
    {
        scanf("%d%d", &M[i].r, &M[i].c);
        dp[i][i] = 0;
    }
    printf("%d\n", DP(1, n));
    return 0;
}