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<stdio.h>

#define N 101

int main(){
  int n;
  int p[N];
  int m[N][N];
  scanf("%d",&n);
  for(int i=1;i<=n;i++){
    scanf("%d%d",&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;
      /*2<<21*/
      m[i][j]=2097152;
      for(int k=i;k<=j-1;k++){
	/*さいしょう比較*/
	if(m[i][j]<m[i][k]+m[k+1][j]+p[i-1]*p[k]*p[j])
	
	  m[i][j]=m[i][j];
	else
	  m[i][j]=m[i][k]+m[k+1][j]+p[i-1]*p[k]*p[j];
      }
    }
  }
  printf("%d\n",m[1][n]);
  
  return 0;


  }

C++: #include <iostream>
#include <fstream>
#include <cstdlib>
#include <math.h>
#include <utility>
#include <algorithm>
#include <functional>
#include <vector>
#include <numeric>
#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using vi = vector<int>;
using vll = vector<ll>;
using vb = vector<bool>;
using qi = queue<int>;
using Graph = vector<vector<int>>;

#define FOR(i, a, b) for (int i = a; i < (b); i++)
#define REP(i,n) for(int i=0;i<n;i++)

ll dp(int* r, int* c, int n) {
    ll table[n][n];
    REP(i, n) table[i][i] = 0;
    FOR(i, 1, n) {
        REP(j, n-i) {
            table[j][j+i] = table[j][j+i-1] + r[j]*c[j+i-1]*c[j+i];
            FOR(k, j, j+i) {
                table[j][j+i] = min(table[j][k] + r[j]*c[k]*c[j+i] + table[k+1][j+i], table[j][j+i]);
            }
        }
    }
    return table[0][n-1];
}

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

    int n; cin >> n;
    int r[n], c[n];
    REP(i, n) {
        cin >> r[i] >> c[i];
    }

    // a に含まれる n 個の値で k を作ったときの最大値は何か
    int table = dp(r, c, n);

    cout << table << "\n";
}

C++: // http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=ALDS1_10_B
// Dynamic Programming - Matrix Chain Multiplication
// TODO: review

#define SUBMIT

#include <utility>
#include <algorithm>
#include <iostream>
#include <iomanip>
#include <vector>
#include <limits>
#include <numeric>
#include <functional>
#include <set>
#include <cmath>
#include <cstring>
#include <climits>
#include <memory>

using namespace std;
using ui64 = unsigned long long;
using i64 = long long;

const ui64 MAX_N = 100;
// dp[i][j] [i, j]までの行列をかけたときの最小コスト
int dp[MAX_N + 1][MAX_N + 1];
int p[MAX_N + 1];

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

    // initialization
    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) {
            auto j = i + l - 1;
            dp[i][j] = 1 << 21;
            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;
    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;

long long dp[105][105];
pair<int,int> p[105];

int main()
{
    int n;
    cin>>n;
    for(int i=0;i<n;i++) for(int j=0;j<n;j++) dp[i][j]=2e9;
    for(int i=0;i<n;i++) {cin>>p[i].first>>p[i].second;dp[i][i]=0;}
    for(int i=0;i < n;i++){
        for(int j=i;j < n;j++){
            for(int k=i;k<j;k++){
                dp[i][j] = min(dp[i][j],dp[i][k]+dp[k+1][j]+p[i].first*p[k].second*p[j].second);
            }
        }
    }
    for(int i=0;i < n;i++){
        for(int j=i;j < n;j++){
            for(int k=i;k<j;k++){
                dp[i][j] = min(dp[i][j],dp[i][k]+dp[k+1][j]+p[i].first*p[k].second*p[j].second);
            }
        }
    }
    cout<<dp[0][n-1]<<endl;
    return 0;
}

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

int nlist[110];
int dp[110][110];

int main(){
  int n;
  cin >> n;
  for(int i = 0; i < n; i++){
    cin >> nlist[i] >> nlist[i+1];
  }
  for(int i = 1; i < n; i++){
    for(int j = 0; j < n - i; j++){
      dp[j][j+i] = 1 << 30;
      for(int k = 0; k < i; k++){
	    dp[j][j+i] = min(dp[j][j+i], dp[j][j+k] + dp[j+k+1][j+i] + nlist[j] * nlist[j+k+1] * nlist[j+i+1]);
      }
    }
  }
  cout << dp[0][n-1] << endl;
  return 0;
}

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

using namespace std;

int minana(int a,int b){
  if(a<b){
    return a;
  }
  else if(a>b){
    return b;
  }
  else return a;
}


int main(){
  int n;
  cin>>n;
  int r[100];
  int m[101][101];
  int j;
  int q=0;
  //int c[n];
  for(int i=1;i<=n;i++){
    cin>>r[i-1]>>r[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++){
      j=i+l-1;
      m[i][j]=(1<<21);
      for(int k=i;k<j;k++){
	q=m[i][k]+m[k+1][j]+r[i-1]*r[k]*r[j];
	m[i][j]=minana(m[i][j],q);
      }
    }
  }
  
  cout<<m[1][n]<<endl;
  return 0;
}