This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize ("Ofast")
#define all(x) x.begin() , x.end()
typedef long long ll;
typedef pair<ll , ll> pll;
const ll maxn = 212 , md = 1e9 + 7 , inf = 2e16;
ll a[maxn][2];
vector<ll> b[maxn][2];
ll dp[maxn][maxn][26] , cnt[maxn][2];
int main(){
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
memset(a , -1 , sizeof(a));
ll n , m;
cin>>n>>m;
for(ll i = 0 ; i < m ; i++){
ll l , r;
cin>>l>>r; l--; r--;
bool f = false;
if(l > r){
swap(l , r); f = true;
}
a[l][f] = max(a[l][f] , r);
}
for(ll i = 0 ; i < n ; i++){
if(a[i][0] != -1){
b[a[i][0]][0].push_back(i);
}
if(a[i][1] != -1){
b[a[i][1]][1].push_back(i);
}
}
for(ll j = 0 ; j < 26 ; j++){
dp[0][0][j] = 1;
}
for(ll i = 0 ; i < n - 1 ; i++){
if(a[i][0] != -1){
for(ll j = 0 ; j <= i ; j++){
cnt[j][0]++;
}
}
if(a[i][1] != -1){
for(ll j = 0 ; j <= i ; j++){
cnt[j][1]++;
}
}
for(ll j = 0 ; j <= i ; j++){
for(ll k = 0 ; k < 26 ; k++){
dp[i][j][k] %= md;
}
}
for(ll c = 0 ; c < 2 ; c++){
for(auto k : b[i][c]){
for(ll j = 0 ; j <= k ; j++){
cnt[j][c]--;
}
}
}
for(ll j = 0 ; j <= i ; j++){
for(ll k = 0 ; k < 26 ; k++){
dp[i + 1][j][k] += dp[i][j][k];
if(cnt[j][0] == 0){
for(ll t = 0 ; t < k ; t++){
dp[i + 1][i + 1][t] += dp[i][j][k];
}
}
if(cnt[j][1] == 0){
for(ll t = k + 1 ; t < 26 ; t++){
dp[i + 1][i + 1][t] += dp[i][j][k];
}
}
}
}
}
ll ans = 0;
for(ll j = 0 ; j < n ; j++){
for(ll k = 0 ; k < 26 ; k++){
ans += dp[n - 1][j][k];
}
}
ans %= md;
cout<<ans<<'\n';
return 0;
}
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