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 <cstdio>
#include <cstdlib>
#include <cstring>

using namespace std;
const int maxn=100+10;
const int INF=(1<<21);
int n;
int p[maxn];
int dp[maxn][maxn];
int main()
{
//    freopen("in.txt","r",stdin);
    scanf("%d",&n);
    for(int i=0; i<n; i++)
    {
        scanf("%d%d",&p[i],&p[i+1]);
    }

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

    }
    for(int len=2;len<=n;len++)
    {
        for(int i=0;i<n-len+1;i++)
        {
            int j=i+len-1;
            dp[i][j]=INF;
            for(int k=i;k<j;k++)
            {
                dp[i][j]=min(dp[i][j],dp[i][k]+dp[k+1][j]+p[i]*p[k+1]*p[j+1]);
            }
        }
    }
    printf("%d\n",dp[0][n-1]);

    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int, int>;

const ll INF = 1001001001001001;

int n;
ll r[111], c[111];
ll dp[111][111]; // dp[le][ri] = [le, ri) の最小回数

ll rec(int le, int ri) {
    if (dp[le][ri] != INF) return dp[le][ri];
    if (ri - le - 2 == 0) {
        return dp[le][ri] = min(dp[le][ri], r[le] * c[le] * c[ri - 1]);
    }
    if (le + 1 < ri - 1) dp[le][ri] = min(dp[le][ri], rec(le + 1, ri) + r[le] * c[le] * c[ri - 1]);
    if (le < ri - 2) dp[le][ri] = min(dp[le][ri], rec(le, ri - 1) + r[le] * c[ri - 2] * c[ri - 1]);
    for (int md = le + 1; md < ri - 1; md++) {
        dp[le][ri] = min(dp[le][ri], rec(le, md) + rec(md, ri) + r[le] * c[md - 1] * c[ri - 1]);
    }
    return dp[le][ri];
}

int main() {
    cin >> n;
    for (int i = 0; i < n; i++) cin >> r[i] >> c[i];
    for (int i = 0; i < 111; i++) {
        for (int j = 0; j < 111; j++) {
            dp[i][j] = INF;
        }
    }
    if (n == 1) {
        cout << 0 << endl;
        return 0;
    }
    rec(0, n);
    cout << dp[0][n] << endl;
}

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

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;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 <algorithm>
using namespace std;

static const long N = 100;

int main(){
	long n, p[N + 1], m[N + 1][N + 1];
	cin >> n;
	for (long i = 1; i <= n; i++){
		cin >> p[i - 1] >> p[i];
	}

	for (long i = 1; i <= n; i++) m[i][i] = 0;
	for (long l = 2; l <= n; l++){
		for (long i = 1; i <= n - l + 1; i++){
			long j = i + l - 1;
			m[i][j] = (1 << 21);
			for (long k = 0; k <= j - 1; k++){
				m[i][j] = min(m[i][j], m[i][k] + m[i][k] + m[k + 1][j] + p[i - 1] * p[k] * p[j]);
			}
		}
	}

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

	return 0;
}

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

typedef struct{
    int r;
    int c;
}matrix;

int table[100][100];

int calc(matrix* m, int l, int r){
    if(r<=l+1)return 0;
    if(table[l][r]>0)return table[l][r];
    int i, tmp;
    int ans = INT_MAX;
    for(i=l+1;i<r;i++){
        tmp = m[l].r*m[i].r*m[r-1].c + calc(m,l,i) + calc(m,i,r);
        if(tmp<ans)ans = tmp;
    }
    table[l][r] = ans;
    return ans;
}

int main(){
    int i, j, n;
    matrix m[100];
    scanf("%d",&n);
    for(i=0;i<100;i++){
        for(j=0;j<100;j++){
            table[i][j] = 0;
        }
    }
    for(i=0;i<n;i++){
        scanf("%d %d",&(m[i].r),&(m[i].c));
    }
    printf("%d\n",calc(m,0,n));
    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[i][n] << endl;
	
	return 0;
}

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

struct mat{
  int row, col;
};

int m[101][101];
mat p[101];

int main(){
  int n;
  cin >> n;
  for(int i = 1; i <= n; i++) cin >> p[i].row >> p[i].col;
  for(int l = 2; l <= n; l++){
    for(int i = 1; i <= n - l + 1; i++){
      int j = i + l - 1;
      if(i == j) m[i][j] = 0;
      else{
	int minc = 1e9;
	for(int k = i; k < j; k++){
	  int x = m[i][k] + m[k+1][j] + p[i].row * p[k].col * p[j].col;
	  minc = minc < x ? minc : x;
	}
	m[i][j] = minc;
      }
    }
  }
  cout << m[1][n] << endl;
  return 0;
}