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 <array>
#include <limits>

using namespace std;

struct MatrixDims {
    int row;
    int col;
    MatrixDims() {}
    MatrixDims(int row, int col) : row(row), col(col) {}
};

array<MatrixDims, 100> matrix_dims;
array<array<int, 100>, 100> dp;

int get_min(int row, int col) {
    int min = numeric_limits<int>::max();
    for (int j = row; j < col; ++j) {
        int sum = dp[row][j] + dp[j+1][col] + matrix_dims[row].row * matrix_dims[j].col * matrix_dims[col].col;
        if (sum < min) min = sum;
    }
    return min;
}

int main()
{
    int n;
    cin >>  n;
    for (int i = 0; i < n; ++i) {
        int row, col;
        cin >> row >> col;
        matrix_dims[i] = MatrixDims(row, col);
    }
    dp.fill({});
    
    for (int endpt = 1; endpt < n; ++endpt) {
        for (int diag_i = 0; (endpt + diag_i) < n; ++diag_i) {
            dp[diag_i][diag_i + endpt] = get_min(diag_i, endpt + diag_i);
        }
    }
    cout << dp[0][n-1] << endl;
}

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];  // pは行と列を入れる配列，mは行列の計算回数を入れる配列
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> p[i - 1] >> p[i];  // 行と列を入れている
    }

    for (int i = 1; i <= n; i++) {
        m[i][i] = 0;  // 対角成分を初期化する(同じ行列同士をかける場所だから)
    }
    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 <stdio.h>

int n;
int r[100], c[100];
int dp[101][101];

int main(void)
{
	int i, j, w, m;
	
	for (i = 0; i < 101; i++){
		for (j = 0; j < 101; j++){
			dp[i][j] = 1 << 28;
		}
	}
	for (i = 0; i < 100; i++){
		dp[i][i + 1] = 0;
	}
	
	scanf("%d", &n);
	for (i = 0; i < n; i++){
		scanf("%d %d", &r[i], &c[i]);
	}
	
	for (w = 2; w <= n; w++){
		for (i = 0; i + w <= n; i++){
			for (m = i + 1; m < i + w; m++){
				if (dp[i][i + w] > dp[i][m] + dp[m][i + w] + r[i] * r[m] * c[i + w - 1]){
					dp[i][i + w] = dp[i][m] + dp[m][i + w] + r[i] * r[m] * c[i + w - 1];
				}
			}
		}
	}
	
	printf("%d\n", dp[0][n]);
}

C++: #include<cstdio>
#include<cstring>

int r[105];
int c[105];
int cache[105][105];

int f(int a, int b){
	if(a==b)
		return 0;
	if(cache[a][b] == -1)
	{
		cache[a][b] = 1000000000; 
		for(int i = a; i<b; i++){
			int res = f(a,i) +f(i+1, b) +r[a]*c[i]*c[b];
			if(res<cache[a][b])
				cache[a][b] = res;
		}
	}
	return cache[a][b];
	
}

int  main(){
	int n;
	scanf("%d",&n);
	for(int i = 0; i<n; i++){
		scanf("%d %d",&r[i], &c[i]);	
	}
	memset(cache, -1, sizeof(cache));
	printf("%d\n",f(0,n-1));
}

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


static const int N = 100;

int m[N+1][N+1];
int main()
{
    int n,p[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;
    int i;
    for(int l=2;l<=n;l++)
    {
        for(int i=1;i<=n-l+1;i++)
        {
            int j=i+l-1;
            m[i][j]=(9999999);
            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 << "l i j k m[i][j]:" <<l<<" " << i << " " << j << " "<<k<<" "<<m[i][j]<<endl;
            }
        }
    }
    cout <<m[1][n] << endl;

    return 0;
}

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

struct Matrix{
  int x, y;
};

int dp[111][111];
vector<Matrix> v;
Matrix matrix[111][111];

int main(){

  int n, r, c;

  cin >> n;

  for(int i = 0; i < n; i++){
    cin >> r >> c;
    v.push_back((Matrix){r,c});
  }

 
  for(int i = 0; i < n; i++) dp[i][i] = 0;
  for(int i = 1; i < n; i++){
    for(int j = 0; j < n - i; j++){
      int s = j + i;
      dp[j][s] = INT_MAX;
      for(int l = j; l < s; l++){
	dp[j][s] = min(dp[j][s],dp[j][l] + dp[l+1][s] + v[j].x * v[s].y * v[l].y);
      }
    }
  }
  cout << dp[0][n-1] << endl;
 }

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>
#define _GLIBCXX_DEBUG
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rrep(i, n) for (int i = 1; i < (n+1); ++i)
using namespace std;
using ll = long long;
const int INF = +100100100;
// typedef pair<int,int> P;

vector<int>P;

int dp(int n){
    vector<vector<int>> D(n,vector<int>(n));
    rep(j,n){
        for(int i = j;i>=0;--i){
            if(i==j)D[i][j]=0;
            else{
                int mini = INF;
                for(int k = i;k<j;++k){
                    int rel = D[i][k]+D[k+1][j]+P[i]*P[k+1]*P[j+1];
                    mini = min(mini,rel);
                }
                D[i][j]=mini;
            }
        }
    }
    return D[0][n-1];
}

int main(){
    int n;
    cin>>n;
    rep(i,n){
        int x,y;cin >> x>>y;
        if(i==0){
            P.push_back(x);
            P.push_back(y);
        }
        else{
            P.push_back(y);
        }
    }
    cout << dp(n) << endl;
    return 0;
}