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<iostream>
#include<algorithm>
using namespace std;

int matrixChainMultiplication(int **m,int *p,int n);

const int Sentinel = 2000000;

int main(){
	int n,row,column,*p,**m; cin>>n;
	p = new int[n+1];
	for(int i=1;i<=n;i++){
		cin>>row>>column;
		p[i-1] = row; p[i] = column;
	}

	m = new int*[n+1]; for(int i=0;i<=n;i++) m[i] = new int[n+1];

	cout<<matrixChainMultiplication(m,p,n)<<endl;

	delete [] p;
	for(int i=0;i<=n;i++) delete [] m[i]; delete [] m;
}

int matrixChainMultiplication(int **m,int *p,int n){
	for(int i=1;i<=n;i++) m[i][i] = 0;

	int minimum = 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] = Sentinel;
			for(int k=i;k<j;k++){
				m[i][j] = min(m[i][k]+m[k+1][j]+p[i-1]*p[k]*p[j],m[i][j]);
				minimum = (minimum,m[i][j]);
			}
		}
	}
	return minimum;
}

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

using namespace std;



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]>>r[i-1];
  }
  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]=min(m[i][j],q);
      }
    }
  }
  
  cout<<m[1][n]<<endl;
  return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(ll i=0; i<n; i++)
typedef long long ll;
typedef long long unsigned int llu;
ll MOD = 1000000007;
ll INF = 1000000009;

int a[110];
int b[110];
int dp[110][110];
/*
dp[i][j]:行列i~jまでの乗算回数の最小値
dp[i][j]=min(dp[i-1][j]+(a[i-1]*b[i-1]*[b[j]])), dp[i][j+1]+(a[i]*a[j+1]*b[j+1]))
*/

void solve(){

    int n;
    cin >> n;
    rep(i,n){
      cin >> a[i] >> b[i];
    }
    rep(i,110){
      rep(j,110){
          dp[i][j]=0;
      }
    }
    
    for(int i=1; i<n; i++){
        dp[i-1][i]=a[i-1]*b[i-1]*b[i];
    }
    

    for(int i=2; i<n; i++){
        for(int j=0; j<n-i; j++){
            int ans = INF;
            int x = j;
            int y = i+j;
            for(int k=0; k<y-x; k++){
                ans = min(int(ans), int(dp[x][x+k]+dp[x+k+1][y]+a[x]*b[x+k]*b[y]));
            }
            dp[j][i+j]=ans;
        }
    }

    /*
    rep(i,n){
        rep(j,n){
            cout << dp[i][j] << " ";
        }
        cout << endl;
    }
    */

    cout << dp[0][n-1] << endl;

}


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

C++: //
//  main.cpp
//  longest_common_subsequence
//
//  Created by ???????????? on 2017/10/17.
//  Copyright ?? 2017 ????????????. All rights reserved.
//

#include <iostream>
#include <stdio.h>
#include <string.h>

using namespace std;

char X[1005];
char Y[1005];

void lcs(){
    size_t m = strlen(X);
    size_t n = strlen(Y);
    int c[m+1][n+1];
    c[0][0] = 0;
    for (int i = 1; i <= m; i++) c[i][0] = 0;
    for (int j = 1; j <= n; j++) c[0][j] = 0;
    for (int i = 1; i <= m; i++){
        for(int j = 1; j <= n; j++){
            if (X[i] == Y[j]){
                c[i][j] = c[i-1][j-1]+1;
            }
            else if(c[i-1][j] >= c[i][j-1]){
                c[i][j] = c[i-1][j];
            }
            else{
                c[i][j] = c[i][j-1];
            }
        }
    }
    cout << c[m][n] << endl;
//    cout << c[m+1][n+1] << endl;
}

int main(int argc, const char * argv[]) {
    int n, i;
    scanf("%d", &n);
    for (i = 0; i < n; i++){
        scanf("%s", X);
        scanf("%s", Y);
        lcs();
    }
//    std::cout << "Hello, World!\n";
    return 0;
}

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

int main() {

  int n;
  cin >> n;

  // l × m 行列と m × n 行列の積では、l × m × n 回の計算が生じる
  // M_i を p_i-1 × p_i 行列とすると、M_i × M_i+1 の計算回数は、p_i-1 × p_i × p_i+1 となる
  // M_1, M_2, M_3 が与えられたとき、((M_1 × M_2) × M_3) と (M_1 × (M_2 × M_3)) の計算量が少ない方を選択する

  // p:M_i を p_i-1 × p_i 行列とする
  vector<int> p(n+1);
  for (int i = 1; i <= n; i++) {
    cin >> p[i-1] >> p[i];
  }

  // cost[i][j]:M_i から M_j までの最小計算量
  vector<vector<int>> cost(n+1, vector<int> (n+1));

  // i から l 個まで調べる
  for (int l = 2; l <= n; l++) {
    for (int i = 1; i <= n - l + 1; i++) {
      // i から l までの個数
      int j = i + l - 1;
      // 大きい数値を入れておく
      cost[i][j] = 1000000007;
      // i から j 回調べる
      for (int k = i; k < j; k++){
        cost[i][j] = min(cost[i][j], cost[i][k] + cost[k+1][j] + p[i - 1] * p[k] * p[j]);
      }
    }
  }

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

  return 0;

}

C++: #include<iomanip>
#include<limits>
#include<thread>
#include<utility>
#include<iostream>
#include<string>
#include<algorithm>
#include<set>
#include<map>
#include<vector>
#include<stack>
#include<queue>
#include<cmath>
#include<numeric>
#include<cassert>
#include<random>
#include<chrono>
#include<unordered_map>
#include<fstream>
#include<list>
#include<typeinfo>
#include<functional>
#include<complex>
using namespace std;
typedef unsigned long long int ull;
typedef long long int ll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pi;
typedef pair<double,double> pd;
typedef pair<double,ll> pdl;
#define F first
#define S second
const ll E=1e18+7;
const ll MOD=1000000007;



int main(){
    ll n;
    cin>>n;
    vector<vector<ll>> dp(n+1,vector<ll>(n+1,E));
    vector<pll> A(n);
    for(int i=0;i<n;i++){
        dp[1][i]=0;
        ll r,c;
        cin>>r>>c;
        A[i]={r,c};
    }
    for(int i=2;i<=n;i++){
        for(int t=0;i+t<=n;t++){
            for(int h=0;h+1<i;h++){
                //cout<<i<<" "<<t<<" "<<h<<endl;
                dp[i][t]=min(dp[i][t],dp[h+1][t]+dp[i-h-1][t+h+1]+A[t].F*A[t+h].S*A[t+i-1].S);
            }
        }
    }
    cout<<dp[n][0]<<endl;
    
    
    return 0;
}