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 <limits>
using namespace std;

const int N = 100;

int main(){
  int n;
  cin >> n;
  int p[N+1], m[N+1][N+1];
  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] = numeric_limits<int>::infinity();
      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<stdio.h>
#include<algorithm>

using namespace std;
int n;
int m[101][101]; 
int s[101][101];
int q;
//連鎖行列積
int mco(int p[]) {
	for (int i = 1; i < n + 1; i++) {
		m[i][i] = 0; 
	}
	for (int l = 2; l < n + 1; l++) {
		for (int i = 1; i < n - l + 2; i++) {
			int j = i + l - 1;
			m[i][j] = 2000000;
			for (int k = i; k < j ; k++) {
				q = m[i][k] + m[k + 1][j] + p[i - 1] * p[k] * p[j];
				m[i][j] = min(q, m[i][j]);
				
			}
		}

	}return m[1][n];
	

}
int main() {
	cin >> n;
	int p[101];
	for (int i = 0; i < n; i++) {
		cin >> p[i] >> p[i + 1];
	}
	cout << mco(p) << endl;
	return 0;
	
	
}

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

int min(int x, int y)
{
	return x>y ? y : x;
}

int main()
{
	int n; std::cin >> n;
	
	int* r = new int[n];
	int* c = new int[n];
	for (int i=0; i<n; i++) std::cin >> r[i] >> c[i];
	
	long long int** DP = new long long int*[n];
	for (int i=0; i<n; i++) DP[i] = new long long int[n];
	
	for (int d=0; d<n; d++) {
		for (int i=0; i<n-d; i++) {
			if (d==0) DP[i][i] = 0;
			else {
				long long int opt = LLONG_MAX;
				for (int j=0; j<d; j++) {
					long long int tmp = r[i] * c[i+j] * c[i+d] + DP[i][i+j] + DP[i+j+1][i+d];
					if (opt > tmp) opt = tmp;
				}
				DP[i][i+d] = opt;
			}
		}
	}
	
	std::cout << DP[0][n-1] << std::endl;
	
	for (int i=0; i<n; i++) delete[] DP[i];
	delete[] DP;
	
	return 0;
}

C++: #include <iostream>
#include <algorithm>

using namespace std;

int main() {
	int n;
	cin >> n;
	int ma[2][101];
	for (int i = 0; i < n; ++i) {
		cin >> ma[0][i] >> ma[1][i];
	}

	long counts[101][101];
	long k1, k2;
	long mins1;
	for (int i = 0; i < n; ++i) {
		for (int j = 0; j < n; ++j) {
			if (i <= j) {
				counts[i][j] = 0;
			}
		}
	}

	for (int l = 0; l < n; ++l) {
		for (int i = 0; i < n-l; ++i) {
		
			int j = i +l+1;
			mins1 = 100000000;
			for (int k = i; k < j; ++k) {
				k1 = counts[i][k] + counts[k+1][j] + ma[0][i] * ma[1][k] * ma[1][j];
				if (mins1 > k1) {
					mins1 = k1;
				}
			}
			counts[i][j] = mins1;
			
		}
	}
	cout << counts[0][n - 1] << endl;
	return 0;
}

C++: #include<stdio.h>
#include<algorithm>
#define MAX 101
using namespace std;

typedef struct Matrix {
    int r, c;
} Matrix;

Matrix M[MAX];

int Matrix_Chain_Multiplication(int n) {
    int m[MAX][MAX];
    
    if (n==1) return 0;

    for (int i=1; i<=n; i++) {
        m[i][i] = 0;
    }
    
    for (int i=1; i<n; i++) {
        m[i][i+1] = M[i].r*M[i].c*M[i+1].c;
    }

    for (int k=2; k<n; k++) {
        for (int i=1; i+k<=n; i++) {
            m[i][i+k] = (1 << 21);
            for (int j=i; j<i+k; j++) {
                m[i][i+k] = min(m[i][i+k], m[i][j]+m[j+1][i+k]+M[i].r*M[j].c*M[i+k].c);
            }
        }
    }

    return m[1][n];
}

int main() {
    int n;
    
    scanf("%d", &n);
    for (int i=1; i<=n; i++) scanf("%d %d", &M[i].r, &M[i].c);
    
    int minimum = Matrix_Chain_Multiplication(n);

    printf("%d\n", minimum);

    return 0;
}

C++: #include <iostream>
#include <sstream>
#include <cstdio>
#include <stdlib.h>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
int n,array[101],m[101][101];
void matrixchainorder(){
  int i,j,l,k;
  for(i=0;i<n+1;i++)
    for(j=0;j<n+1;j++)
      m[i][j]=2000000000;
  for(i=0;i<n+1;i++)m[i][i]=0;
  for(l=2;l<=n;l++){
    for(i=1;i<=n-l+1;i++){
      j=i+l-1;
      for(k=i;k<=j-1;k++){
	m[i][j]=min(m[i][j],m[i][k]+m[k+1][j]+array[i-1]*array[k]*array[j]);
      }
    }
  }
}
int main(){
  cin>>n;
  for(int i=0;i<n;i++)cin>>array[i]>>array[i+1];
  matrixchainorder();
  cout<<m[1][n]<<endl;

  return 0;
}