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 <vector>
#include <string>
#include <stack>
#include <queue>

using namespace std;

static const int N = 1000;

int n, p[N + 1], m[N + 1][N + 1];

int main(){
	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;
int p[105];
int m[110][110];
int n;

int main() {
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> p[i-1];
        cin >> p[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] = (i << 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<cstring>
#include<algorithm>
using namespace std;

int mcm(int p[], int n) {
	int m[n+1][n+1];
	memset(m, 0, sizeof(m));

	for (int s = 0; s < n; s++) {
		for (int i = 1, j = s + 2; j <= n; i++, j++) {
			m[i][j] = 1 << 30;
			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]);
			}
		}
	}
	return m[1][n];
}

int main() {
	int n, d;
	cin >> n;
	int p[n+1];
	for (int i = 0; i < n-1; i++) {
		cin >> p[i] >> d;
	}
	cin >> p[n-1] >> p[n];
	int ans = mcm(p, n);
	cout << ans << endl;
	return 0;
}

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

#define N 100

int M[101][101], p[101], n;

int solve()
{
	int l, i, j, k;
	for (l = 2; l <= n; l++) {
		for (i = 1; i <= n - l + 1; i++) {
			j = i + l - 1;
			M[i][j] = INT32_MAX;
			for (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]);
		}
	}
	return M[1][n];
}

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

	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;

	cout << solve() << endl;
	return 0;
}

C++: #include<stdio.h>
#include<iostream>
//#include<queue>
#include<algorithm>
using namespace std;
static const int N = 100;

int main() {
	int i, n, m[N + 1][N + 1], p[N + 1];
	//priority_queue<int> PQ;

	scanf("%d", &n);

	for (i = 1; i <= n; i++)scanf("%d %d", &p[i - 1], &p[i]);

	for (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]);
			}
		}
	}

	printf("%d\n", m[1][n]);

	return 0;
}

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

vector<vector<int> > cost,best;
vector<int> A;

void compute(int s,int e){
	int minc = 0;
	int mink = -1;
	for(int k=s+1;k<=e;++k){
		if (cost[s][k-1] < 0){
			compute(s,k-1);
		}
		if (cost[k][e] < 0) {
			compute(k,e);
		}
		int c = cost[s][k-1] + A[s]*A[k]*A[e+1] + cost[k][e];
		if (mink < 0 || c < minc) {
			minc = c;
			mink = k;
		}
	}
	cost[s][e] = minc;
	best[s][e] = mink;
}

int main(){
	int n;
	cin >> n;
	A.resize(n+1);
	for(int i=0;i<n;++i) {
		int r,c;
		cin >> r >> c;
		if (i==0){
			A[0] = r;
		}
		if (A[i] != r){ cout << "error";exit(0);}
		A[i+1] = c;
	}
	cost.resize(n);
	best.resize(n);
	for(int i=0;i<n;++i){
		cost[i].resize(n);
		best[i].resize(n);
		for(unsigned j=0;j<cost[i].size();++j){
			cost[i][j] = -1;
			best[i][j] = -1;
		}
		cost[i][i]=0;
		best[i][i]=i;
	}
	compute(0,n-1);
	cout << cost[0][n-1] << std::endl;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i, a) for(int i=0; i<(int)(a); i++)
typedef long long ll;
const ll inf = 1LL<<60;

int main()
{
  int n; cin >> n;
  vector<int> p(n+1, 0);
  rep(i, n) cin >> p[i] >> p[i+1];
  vector<vector<ll>> dp(n+1, vector<ll>(n+1, inf));
  rep(i, n+1) dp[i][i] = 0;
  rep(i, n) dp[i][i+1] = 0;
  for (int len=2; len<=n; len++) {
    for (int left=0; left+len<=n; left++) {
      int right = left+len;
      dp[left][right] = inf;
      for (int i=left+1; i<right; i++) {
        dp[left][right] = min(dp[left][right], dp[left][i] + dp[i][right] + p[left]*p[i]*p[right]);
      }
    }
  }
  cout << dp[0][n] << endl;

  return 0;
}

C++: #include<iostream>
using namespace std;
#define M 101
#define I 100000000
int main(){
    int n,p[M],m[M][M],i,j,k,t;
    cin>>n;
    for(i=1;i<=n;i++){
        cin>>p[i-1]>>p[i];
    }
    for(i=1;i<=n;i++)m[i][i]=0;
    for(i=2;i<=n;i++){
        for(j=1;j<=n-i+1;j++){
            t=i+j-1;
            m[j][t]=I;
            for(k=j;k<=t-1;k++){
                m[j][t]=min(m[j][t],m[j][k]+m[k+1][t]+p[j-1]*p[k]*p[t]);
            }
        }
    }
    cout<<m[1][n]<<endl;
    return 0;
}