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 <cmath>
#include <iomanip>
#include <limits>
#include <string>
#include <vector>
#include <algorithm>
#include <stack>
#include <queue>
#include <map>
#include <list>
#include <cctype>
using namespace std;
typedef long long ll;
#define rep(i,n) for(ll i=0;i<(n);i++)
ll INF=1000000007;

int main(){
    ll dp[110][110];
    ll n;
    cin >> n;
    ll r[n],c[n];
    rep(i,n) cin >> r[i] >> c[i];
    rep(i,n) dp[i][i]=0;
    for(ll m=1;m<=n-1;m++){
        rep(i,n-m){
            dp[i][i+m]=INF;
            for(ll k=i;k<=i+m-1;k++){
                if(dp[i][i+m]>dp[i][k]+dp[k+1][i+m]+r[i]*c[k]*c[i+m]){
                    dp[i][i+m] = dp[i][k]+dp[k+1][i+m]+r[i]*c[k]*c[i+m];
                }
            }
        }
    }
    cout << dp[0][n-1] << endl;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define INFTY powl(2,60)

vector<vector<long long>> m(101,vector<long long>(101));
vector<int> p(101);

long long matrixChainMultiplication(int n){
    for(int i=1;i<n+1;i++){
        m[i][i]=0;
    }
    for(int l=1;l<n;l++){
        for(int i=1;i<n-l+1;i++){
            int j=i+l;
            m[i][j]=INFTY;
            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]);
            }
        }
    }
    return m[1][n];
}

int main(){
    int n;
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>p[i]>>p[i+1];
    }
    cout<<matrixChainMultiplication(n)<<endl;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0; i<(n); i++)
#define all(n) begin(n),end(n)


const int INF = 1e9;
int main() {
    int n;
    cin >> n;
    vector<int> p(n+1);
    int dp[105][105];
    rep(i,n) cin >> p[i] >> p[i+1];
    rep(i,n){
        rep(j,n) dp[i][j] = INF;
    }
    int mn;
    for(int i = 0; i < n; ++i) dp[i][i] = 0;
    for(int l = 2; l <= n; ++l){
        for(int i = 1; i + l -1 <= n; ++i){
            int j = i + l -1;
            for(int k = i; k < j; ++k){
                if(k==i) mn = dp[i][k] + dp[k+1][j] + p[i-1] * p[k] * p[j];
                else mn = min(mn, dp[i][k] + dp[k+1][j] + p[i-1] * p[k] * p[j]);
            }
            dp[i][j] = mn;
        }
    }
    cout << dp[1][n] << endl;
    return 0;
}

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

int *r, *c;

int main() {
  int n, i;

  scanf("%d", &n);

  r = (int *) malloc(sizeof(int)*n);
  c = (int *) malloc(sizeof(int)*n);

  for(i = 0; i < n; i++) {
    scanf("%d %d", &r[i], &c[i]);
  }

  printf("%d\n", cost(0, n-1));

  free(r);
  free(c);

  return 0;
}

int cost(int a, int b) {
  if (a == b) {
    return 0;
  } else {
    int total, minTotal = 1000000, m;

    for(m = a; m < b; m++) {
      total = cost(a, m) + cost(m+1, b) + r[a]*c[m]*c[b];
      if (total < minTotal)
        minTotal = total;
    }

    return minTotal;
  }
}

C++: #include<iostream>
#include<climits>
using namespace std;
int main(){
  int n,data[101]; cin>>n;
  for(int i=0;i<n;++i) cin>>data[i]>>data[i+1];
  int dp[100][100]={};
  for(int num=2;num<=n;++num){
    for(int first=0;first<=n-num;++first){
      int end=first+num-1;
      dp[first][end]=INT_MAX/2;
      for(int i=first;i<=end;++i){
	if(dp[first][end]>dp[first][i]+dp[i+1][end]+data[first]*data[i+1]*data[end+1])
	  dp[first][end]=dp[first][i]+dp[i+1][end]+data[first]*data[i+1]*data[end+1];
      }
    }
  }
  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<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;
}