Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

// I/O
type Scanner struct {
	sc *bufio.Scanner
}

func NewScanner() *Scanner {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)
	sc.Buffer(make([]byte, 1024), int(1e+9))
	return &Scanner{sc}
}

func (s *Scanner) nextStr() string {
	s.sc.Scan()
	return s.sc.Text()
}

func (s *Scanner) nextInt() int {
	i, e := strconv.Atoi(s.nextStr())
	if e != nil {
		panic(e)
	}
	return i
}

func (s *Scanner) nextFloat() float64 {
	f, e := strconv.ParseFloat(s.nextStr(), 64)
	if e != nil {
		panic(e)
	}
	return f
}

func (s *Scanner) nextRuneSlice() []rune {
	return []rune(s.nextStr())
}

func (s *Scanner) nextIntSlice(n int) []int {
	res := make([]int, n)
	for i := 0; i < n; i++ {
		res[i] = s.nextInt()
	}
	return res
}

func (s *Scanner) nextFloatSlice(n int) []float64 {
	res := make([]float64, n)
	for i := 0; i < n; i++ {
		res[i] = s.nextFloat()
	}
	return res
}

// Arithmetic
func max(nums ...int) int {
	m := nums[0]
	for _, i := range nums {
		if m < i {
			m = i
		}
	}
	return m
}

func min(nums ...int) int {
	m := nums[0]
	for _, i := range nums {
		if m > i {
			m = i
		}
	}
	return m
}

func abs(x int) int {
	if x > 0 {
		return x
	}
	return -x
}

func pow(x, y int) int {
	res := 1
	for i := 0; i < y; i++ {
		res *= x
	}
	return res
}

func ceil(a, b int) int {
	if a%b == 0 {
		return a / b
	} else {
		return a/b + 1
	}
}

// Sort
type RuneSlice []rune

func (a RuneSlice) Len() int           { return len(a) }
func (a RuneSlice) Less(i, j int) bool { return a[i] < a[j] }
func (a RuneSlice) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }

// Main
func main() {
	sc := NewScanner()
	wtr := bufio.NewWriter(os.Stdout)
	N := sc.nextInt()
	p := make([]int, N+1)
	dp := make([][]int, N+1)
	for i, _ := range dp {
		dp[i] = make([]int, N+1)
	}
	for i := 0; i < N; i++ {
		p[i] = sc.nextInt()
		p[i+1] = sc.nextInt()
	}
	for i := 1; i <= N; i++ {
		dp[i][i] = 0
	}
	for l := 2; l <= N; l++ {
		for i := 1; i <= N-l+1; i++ {
			j := i + l - 1
			dp[i][j] = 1 << 60
			for 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])
			}
		}
	}

	fmt.Fprintln(wtr, dp[1][N])
	wtr.Flush()
}

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

#define ASC(vec) vec.begin(), vec.end()		// 昇順ソート 例：sort(ASC(vec));
#define DESC(vec) vec.rbegin(), vec.rend()	// 降順ソート 例:sort(DESC(vec));
#define rep(i, n) for(int i = 0; i < (n); i++)
#define Rep(i, n) for(int i = 1; i < n; i++)

const int mod = 1000000007;
const int inf = (int)1e9 + 7;
const long long INF = 1LL << 60;

using ii = pair<int, int>;
using ll = long long;
using vi = vector<int>;
using vd = vector<double>;
using vb = vector<bool>;
using vl = vector<ll>;
using vs = vector<string>;
using vvi = vector<vector<int>>;
using vvl = vector<vector<ll>>;
using vvb = vector<vector<bool>>;
using vii = vector<pair<int, int>>;

template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }

ll GCD(ll a, ll b) { return b ? GCD(b, a % b) : a; }
ll LCM(ll a, ll b) { return (a * b) / GCD(a, b); }
int round_int(int a, int b) { return (a + (b - 1)) / b; }

// 素因数分解; 返り値は(素数, 乗数)のvector配列
vector<pair<ll, int>> factorize(ll n) {
	vector<pair<ll, int>> res;
	for (ll i = 2; i * i <= n; ++i) {
		if (n % i) continue;
		res.emplace_back(i, 0);
		while (n % i == 0) {
			n /= i;
			res.back().second++;
		}
	}
	if (n != 1) res.emplace_back(n, 1);
	return res;
}

constexpr array<int, 9> dx = { 0, 1, 0, -1, -1, 1, 1, -1, 0 };
constexpr array<int, 9> dy = { 1, 0, -1, 0, 1, 1, -1, -1, 0 };
//constexpr auto MAX = 100000;

// ──────────────────────────────────────────────────────────────────


#define N 101

int dp[N + 1][N + 1], p[N + 1];

int main() {
    int n;

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

    for(int l = 2; l < n + 1; ++l) {
        for(int i = 1; i < n - l + 2; ++i) {// 対象とする行列の数
            int j = i + l - 1;
            dp[i][j] = (1 << 20); // dp[i][j] := [Mi, Mj]の最小回数
            for(int k = i; k < j; ++k) {
                //cout << l << " " << i << " " << j << " " << k << endl;
                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;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define all(obj) (obj).begin(),(obj).end()
typedef long long ll;
ll mod=2e12;
ll cnt=0;
#define nil -1
int p[200];
int c[200][200];

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n;cin>>n;
    for(int i=1;i<=n;i++) cin>>p[i-1]>>p[i];
    for(int i=0;i<=n;i++)c[i][i]=0;
    for(int l=2;l<=n;l++){
      for(int i=1;i<=n-l+1;i++){
        int j=i+l-1;
        c[i][j]=(1<<21);
        for(int k=i;k<=j-1;k++){
          c[i][j]=min(c[i][j],c[i][k]+c[k+1][j]+p[i-1]*p[k]*p[j]);
        }
      }
    }
    cout<<c[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++){//因l(字母)1(数字）分不清，本人将其改?大写字母L 
        for(int i=1;i<=n-L+1;i++){
            int j=i+L-1;
            m[i][j]=(1<<21);//本人注解，相当于INF
            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;//本人注解，注意此?是1(数字)而不是l(字母) 
    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<bits/stdc++.h>
using namespace std;

const int N=505;
int mat[N][2];
int mem[N][N];

int mcm(int l, int r){
  if(l==r)  return mem[l][r]=0;
  if(mem[l][r]!=-1) return mem[l][r];
  int ret = INT_MAX;
  for (int i = l; i < r; ++i){
    int now = mcm(l, i);
    now += mcm(i+1, r);
    now += mat[l][0]*mat[i][1]*mat[r][1];
    ret = min(ret, now);
  }
  return mem[l][r]=ret;
}

int main(){
  ios::sync_with_stdio(0);
  cin.tie(0);
  
  int n;  cin >> n;
  for (int i = 0; i < n; ++i){
    cin >> mat[i][0] >> mat[i][1];
  }
  memset(mem, -1, sizeof(mem));
  cout << mcm(0, n-1) << "\n";
  return 0;
}

C++: #include<bits/stdc++.h>
#define rep(i,n) for(int i=0;i< (n);i++)
using namespace std;
typedef long long ll;
const int INF = (1e+9)+7;

int main(){
    int n;cin>>n;
    vector<vector<int>> C(n+1,vector<int>(n+1,0));
    //↑pの為に一つ多く作った。index番号が行列の番号と一致。
    vector<int> p(n+1);
    rep(i,n){
        int a,b;cin>>a>>b;
        if(i == 0){
            p[0] = a;
            p[1] = b;
        }else{
            p[i+1] = b;
        }
    }
    for(int l = 2;l<=n;l++){
        //lは行列の個数.
        for(int i = 1; i+l-1 <= n; i++){
            int j = i+l-1;//左端のindex
            int mn = INF;
            for(int k = i;k<j;k++){
                mn = min(mn,C[i][k]+C[k+1][j]+p[i-1]*p[k]*p[j]);
            }
            C[i][j] = mn;
        }
    }
    cout<<C[1][n]<<endl;
    return 0;
}