Go: package main

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

//util
var sc = bufio.NewScanner(os.Stdin)

func nextStr() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	sc.Scan()
	i, e := strconv.Atoi(sc.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func printList(list []int) {
	buf := bufio.NewWriter(os.Stdout)
	for _, v := range list {
		buf.Write([]byte(fmt.Sprintf(" %d", v)))
	}
	buf.Write([]byte("\n"))
	buf.Flush()
}

//solve
//単純な場合
func matrixChainMultiplication() {
	//行列が1つだけのとき
	for i := 1; i <= n; i++ {
		m[i][i] = 0
	}
	for l := 2; l <= n; l++ {
		for i := 1; i <= n-l+1; i++ {
			j := i + l - 1
			m[i][j] = 1 << 21
			//kまでで区切る
			for 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])
			}
		}
	}
}

func max(a, b int) int {
	if a > b {
		return a
	} else {
		return b
	}
}

func min(a, b int) int {
	if a > b {
		return b
	} else {
		return a
	}
}

const MAX = 100

var n int
var p [MAX + 1]int

//m[i][j]: Mi * Mi+1 * ... * Mjを計算するときに必要なスカラー乗算の最小回数
var m [MAX + 1][MAX + 1]int

func main() {
	sc.Split(bufio.ScanWords)
	n = nextInt()
	for i := 1; i <= n; i++ {

		p[i-1] = nextInt() //行数
		p[i] = nextInt()   //列数
	}

	matrixChainMultiplication()
	fmt.Println(m[1][n])
}

C++: #include<stdio.h>
#include<algorithm>
#include<string.h>
using namespace std;
#define INFTY 2000000001
#define MAX 101

int p[MAX], m[MAX][MAX];
int n = 0;

void mcm() {
  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] = INFTY;
      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[j]*p[k]);
      }
    }
  }
}

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

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

#define N 100

int main(){

  int n, p[N + 1], m[N + 1][N + 1];
  int i, j, k, l;
  
  scanf("%d", &n);
  
  for(i = 1; i <= n; i++){
    scanf("%d", &p[i - 1]);
    scanf("%d", &p[i]);
  }
  
  for(i = 0; i <= n; i++){
    m[i][i] = 0;
  }
  
  for(l = 2; l <= n; l++){
    for(i = 1; i <= n - l + 1; i++){
      int j = i + l - 1;
      m[i][j] = (1 << 21);
      
      for(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 <bits/stdc++.h>
#define rep(i, n) for(int i=0;i<n;i++)
#define rrep(i, n) for(int i=n;i>=0;i--)
#define MAX 100
#define INF 100000001
template<typename T>T chmin(T& a, T b){return a=(a<b)?a:b;}

using namespace std;
// Matrix chain
int matrixes[MAX+1];
int m[MAX+1][MAX+1];

int mco(int i, int j){
  if (m[i][j]!=INF) return m[i][j];
  for (int div=i;div<j;div++)
    chmin(m[i][j], mco(i, div)+mco(div+1, j)+ matrixes[i-1]*matrixes[div]*matrixes[j]);
  return m[i][j];
}

int main(){
  int n;
  scanf("%d", &n);
  rep(i, n)
    scanf("%d%d", matrixes+i,matrixes+i+1);

  for(int i=1;i<n+1;i++){
    for(int j=1;j<n+1;j++){
      m[i][j] = (i!=j)?INF:0;
    }
  }

  printf("%d\n", mco(1, n));
  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 - 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>
using namespace std;
typedef long long ll;
const ll INF = (1LL << 58);
int n;
int S[110];
ll C[110][110];

int main(void) {
    cin >> n;
    for (int i = 1; i <= n; i++) {
        int r, c;
        cin >> r >> c;
        S[i] = r; S[i + 1] = c;
    }

    n++;
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= n; j++) C[i][j] = INF;

    for (int i = 1; i <= n; i++) C[i][i] = 0;

    for (int j = 1; j <= n - 1; j++) {
        for (int i = 1; i <= n - j; i++) {
            for (int k = 1; k <= i + j; k++) {
                C[i][i + j]  = min(C[i][i + j], C[i][k - 1] + C[k][i + j] + S[i] * S[k] * S[i + j + 1]);
            }
        }
    }

    cout << C[1][n - 1] << endl;
    return 0;
}

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

int lcs(std::string x, std::string y) {
	int c[101][101];
	int m = x.size();
	int n = y.size();
	int maxl = 0;
	x = ' ' + x;
	y = ' ' + y;
	for (int i = 1; i <= m; i++) {
		c[i][0] = 0;
	}
	for (int i = 1; i <= n; i++) {
		c[0][j] = 0;
	}

	for (int i = 1; i <= m; i++) {
		for (int j = 1; j <= n; j++) {
			if (x[i] == y[j]) {
				c[i][j] = c[i - 1][j - 1] + 1;
			} else {
				c[i][j] = std::max(c[i - 1][j], c[i][j - 1]);
			}
			maxl = std::max(maxl, c[i][j]);
		}
	}
	return maxl;
}


int main() {
	std::string s1, s2;
	int n;
	std::cin >> n;
	for (int i = 0; i < n; i++) {
		std::cin >> s1 >> s2;
		std::cout << lcs(s1, s2) << std::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 - 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++: //
//  main.cpp
//  matrix_chain_multiplication
//
//  Created by ???????????? on 2017/10/17.
//  Copyright ?? 2017 ????????????. All rights reserved.
//

#include <iostream>
#include <stdio.h>
#define INFTY (1 << 21)


using namespace std;

int p[110];

void matrixChainMultiplication(int n){
    int m[n+1][n+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] = INFTY;
            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;
}


int main(int argc, const char * argv[]) {
    int n, i, pi, pi_1;
    scanf("%d", &n);
    for(i = 0; i < n; i++){
        scanf("%d %d", &pi, &pi_1);
        if(i) p[i+1] = pi_1;
        else {
            p[0] = pi;
            p[1] = pi_1;
        }
    }
    matrixChainMultiplication(n);
//    std::cout << "Hello, World!\n";r
    return 0;
}

C++: #include<iostream>
#include<string>
#include<algorithm>
using namespace std;
static const int N = 1000;

int lcs(string X, string Y) {
	int c[N + 1][N + 1];
	int m = X.size();
	int n = Y.size();
	int maxl = 0;
	X = ' ' + X;
	Y = ' ' + Y;
	for (int i = 1; i <= m; i++)c[i][0] = 0;
	for (int j = 1; j <= n; j++)c[0][j] = 0;

	for (int i = 1; i <= m; i++) {
		for (int j = 1; j <= n; j++) {
			if (X[i] == Y[j]) {
				c[i][j] = c[i - 1][j - 1] + 1;
			}
			else {
				c[i][j] = max(c[i - 1][j], c[i][j - 1]);
			}
			maxl = max(maxl, c[i][j]);
		}
	}
		return maxl;
}

	int main() {
		string s1, s2;
		int n;
		cin >> n;
		for (int i = 0; i < n; i++) {
			cin >> s1 >> s2;
			cout << lcs(s1, s2) << endl;
		}

		return 0;
	}