Go: package main

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

const (
	initialBufSize = 100000
	maxBufSize     = 1000000
)

var sc *bufio.Scanner

func initScanner(r io.Reader) *bufio.Scanner {
	buf := make([]byte, initialBufSize)

	sc := bufio.NewScanner(r)
	sc.Buffer(buf, maxBufSize)
	sc.Split(bufio.ScanWords) // bufio.ScanLines
	return sc
}

func main() {
	sc = initScanner(os.Stdin)
	fmt.Println(resolve(parseProblem()))
}

type matrixSize struct{ row, col int }

func calcNum(i, j matrixSize) int {
	return i.row * j.col * i.col
}

func parseProblem() (int, []matrixSize) {
	n := scanInt(sc)
	sizes := make([]matrixSize, n)
	for i := 0; i < n; i++ {
		sizes[i] = matrixSize{row: scanInt(sc), col: scanInt(sc)}
	}
	return n, sizes
}

var dp [][]int

func initDP(n int) {
	dp = make([][]int, n+1)
	for i := 0; i < len(dp); i++ {
		dp[i] = make([]int, n+1)
		for j := 0; j < len(dp[i]); j++ {
			dp[i][j] = math.MaxInt64
		}
	}
}

func resolve(n int, sizes []matrixSize) int {
	// TODO 復習
	initDP(n)
	_rec(sizes, 0, n)
	return dp[0][n]
}

func _rec(sizes []matrixSize, l, r int) int {
	if dp[l][r] != math.MaxInt64 {
		return dp[l][r]
	}
	if r-l <= 1 {
		dp[l][r] = 0
		return 0
	}
	num := math.MaxInt64
	for i := l + 1; i < r; i++ {
		v := _rec(sizes, l, i) + _rec(sizes, i, r) + calcNum(matrixSize{sizes[l].row, sizes[i].row}, matrixSize{sizes[i].row, sizes[r-1].col})
		if v < num {
			num = v
		}
	}
	dp[l][r] = num
	return dp[l][r]
}

// snip-scan-funcs
func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return int(i)
}
func scanString(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

C++: #include<iostream>
#include<algorithm>
using namespace std;
static const Aint 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] + 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 INF = 1e9;

int main() {
	int n;
	cin >> n;
	vector<int> r(n), c(n);
	for (int i=0;i<n;i++) {
		cin >> r[i];
		cin >> c[i];
	}

	vector<vector<int>> dp(n, vector<int>(n, INF));
	for (int i=0;i<n;i++) dp[i][i] = 0;

	for (int w=1;w<n;w++) {
		for (int j=0;j+w<n;j++) {
			for (int k=0;k<w;k++) {
				dp[j][j+w] = min(dp[j][j+w], dp[j][j+k]+dp[j+k+1][j+w]+r[j]*r[j+k+1]*c[j+w]);
			}
		}
	}

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

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

struct Mat{
	  int r,l;
};

int main(){

	  int n; cin >> n;
	  vector<Mat> Mats(n);
	  for(int i=0; i<n; i++)
			cin >> Mats[i].r >> Mats[i].l;

	  int dp[n][n] = {};
	  for(int i=0; i<n; i++)
			for(int j=0; j<n; j++)
				  if(i==j) dp[i][j] = 0;
				  else dp[i][j] = INT_MAX;

	  for(int k=1; k<n; k++){
			for(int i=0; i+k<n; i++){
				  for(int j=i; j<i+k; j++){
						int num_prod = Mats[i].r * Mats[j+1].r * Mats[i+k].l;
						dp[i][i+k] = min(dp[i][i+k], dp[i][j] + dp[j+1][i+k] + num_prod);
				  }
			}
	  }
	  
	  cout << dp[0][n-1] << endl;
	  
			
}

C++: #include <cstdio>
#include <algorithm>
#define N 100
using namespace std;

int main()
{
  int m[N + 1][N + 1], p[N + 1], n;
  scanf("%d", &n);
  for (int i = 0; i < n; i++)
  {
    scanf("%d%d", &p[i], &p[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++)
    {
      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]);
      }
    }
  }
  printf("%d\n", m[1][n]);
  return 0;
}

C++: //?????????B 
#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<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; 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;
}

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

static const int N = 1000;

int main() {
  int n, m[N+1][N+1], p[N+1];
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> p[i-1];
    cin >> 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-1; i++) {
      int j = i + l - 1;
      m[i][j] = numeric_limits<int>::max();
      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>
#include<algorithm>
#define int long long
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define INF 1000000000000
int MOD=1000000007;
int dp[101][101];
signed main() {
  int n;
  cin>>n;
  rep(i,101){
    rep(j,101){
      dp[i][j]=0;
    }
  }
  vector<int>gyou(n+1);
  vector<int>retu(n+1);
  rep(i,n){
    cin>>gyou[1+i]>>retu[1+i];
  }
  for(int len=2;len<=n;len++){
    for(int l=1;l<=n-len+1;l++){
      int r=l+len-1;
      dp[l][r]=min(dp[l+1][r]+gyou[l]*retu[l]*retu[r],dp[l][r-1]+gyou[l]*gyou[r]*retu[r]);
      if(len>=4)for(int k=l+1;k<r-1;k++){dp[l][r]=min(dp[l][r],dp[l][k]+dp[k+1][r]+gyou[l]*retu[k]*retu[r]);}
    }
  }
  cout<<dp[1][n]<<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<iostream>
#include<algorithm>
using namespace std;

const int N = 1000;

int main() {
    int n;
    int m[N + 1][N + 1];
    int p[N+ 1];
    for (int i = 1; i <= N; i++)
        m[i][i] = 0;
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> p[i] >> p[i + 1];
    }
    for (int i = 2; i <= n; i++) {
        for (int j = 1; j <= n - i + 1; j++) {
            int k = j + i - 1;
            m[j][k] = (1<<21);
            for (int l = j; l < k; l++) {
                m[j][k] = min(m[j][k], m[j][l] + m[l + 1][k] + p[j - 1] * p[l] * p[k]);
            }
        }
    }
    cout << m[1][n] << endl;
    return 0;
}