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 <cstdio>
#include <cstring>
#include <climits>
#include <string>
#include <algorithm>
#include <cmath>
#include <vector>
#include <stack>
#include <queue>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <sstream>
#include <numeric>

// namespace
using namespace std;

// int mcm(const vector<int> &p, int i, int j) { // i-th matrix has the size (p[i], p[i+1])
//     if (i == j) return 0;
//     int m = INT_MAX;
//     for (int k = i; k < j; ++k) {
//         m = min(m, mcm(p, i, k) + mcm(p, k + 1, j) + p[i] * p[k + 1] * p[j + 1]);
//     }
//     return m;
// }

// int mcm(const vector<int> &p, int i, int j, vector<vector<int>> &dp) { // i-th matrix has the size (p[i], p[i+1])
//     if (i == j) return 0;
//     if (dp[i][j] < INT_MAX) return dp[i][j];
//     int m = INT_MAX;
//     for (int k = i; k < j; ++k) {
//         m = min(m, mcm(p, i, k, dp) + mcm(p, k + 1, j, dp) + p[i] * p[k + 1] * p[j + 1]);
//     }
//     return dp[i][j] = m;
// }

int mcm(const vector<int> &p) { // i-th matrix has the size (p[i], p[i+1])
    int n = p.size() - 1;
    vector<vector<int>> dp(n, vector<int>(n, INT_MAX));
    for (int i = 0 ; i < n; ++i) dp[i][i] = 0;
    for (int l = 1; l < n; ++l)
        for (int i = 0, j; (j = i + l) < n; ++i)
            for (int k = i; k < j; ++k)
                dp[i][j] = min(dp[i][j], dp[i][k] + dp[k + 1][j] + p[i] * p[k + 1] * p[j + 1]);
    return dp[0][n-1];
}

int main() {
    int n, r, c;
    cin >> n;
    vector<int> p;
    for (int i = 0; i < n; ++i) {
        cin >> r >> c;
        p.push_back(r);
    }
    p.push_back(c);
    auto ans = mcm(p);
    cout << ans << 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 ( 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++: // http://algorithms.blog55.fc2.com/blog-entry-66.html

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

#define M 100
int R[M+1],C[M][M],B[M][M];
void D(int i,int j){
	if(i==j)printf("M%d",i);
	else printf("("),D(i,B[i][j]-1),D(B[i][j],j),printf(")");
}

main(){
	int N,i=0,j,k,c;
	scanf("%d",&N);
	for(;i<N;i++)scanf("%d%d",R+i,&c);
	R[i]=c;
	memset(C,99,sizeof(C));
	for(i=0;i<N;i++)C[i][i]=0;
	for(j=1;j<N;j++)for(i=0;i<N-j;i++)for(k=i;k<i+j;k++)
		if((c=C[i][k]+C[k+1][i+j]+R[i]*R[k+1]*R[i+j+1])<C[i][i+j])C[i][i+j]=c,B[i][i+j]=k;
	printf("%d\n",C[0][N-1]);
	//order(0,N);
	//puts("");
}

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

static const int N = 100;

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

C++: #include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<cmath>

#define FOR(i,a,b) for(int i=(a);i<(b);++(i))
#define REP(i,n) FOR(i,0,n)

#define dump(x) cerr << #x << " = " <<(x)<<endl;
#define debug(x) cerr << #x << " = " <<(x) << "(L" << __LINE__ << ")" << __FILE__ << endl;

using namespace std;

int main(void){
  int n,i;
  cin >> n;
  vector<int> input(n+1);
  REP(i,n) cin >> input[i] >> input[i+1];
  
  vector<vector<int>> res(n+1, vector<int>(n+1));
  vector<int> p(n+1);
  FOR(i,1,n+1) res[i][i]=0;
  FOR(l,2,n+1){
    FOR(i,1,n-l+2){
      int j = i+l-1;
      res[i][j] = (1<<21);
      FOR(k,i,j){
        res[i][j] = min(res[i][j],res[i][k]+res[k+1][j] + input[i-1]*input[k]*input[j]);

        
      }
    }
  }
  /*
  REP(i,n+1){
    REP(j,n+1){
      cout << res[i][j] << " ";
    }
    cout << endl;
  }
  */
  cout << res[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=0;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 <vector>
#include <numeric>
#include <algorithm>

using vvi = std::vector<std::vector<int>>;

void solve()
{
    using namespace std;

    constexpr int inf = (1 << 23);

    int n;
    cin >> n;

    vector<int> d(n + 1);

    for (int i = 0; i < n; ++i)
    {
        cin >> d[i];
        if(i + 1 != n)
            cin.ignore(numeric_limits<streamsize>::max(), ' ');
    }

    cin.ignore(numeric_limits<streamsize>::max(), ' ');
    cin >> d[n];

    vvi dp (n, vector<int>(n, 0));

    //自分自身との積は乗算が発生しない
    for (int i = 0; i < n; ++i)
        dp[i][i] = 0;

    for (int l = 1; l < n; ++l)
    {
        for (int i = 0; i < n - l; ++i)
        {
            int j = i + l;
            dp[i][j] = inf;
            for (int k = i; k < j; ++k)
            {
                dp[i][j] = min(dp[i][j], dp[i][k] + dp[k + 1][j] + d[i] * d[k + 1] * d[j + 1]);
            }
        }
    }

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

int main()
{
    solve();
        return 0;
}