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;
const int mod = 1e9 + 7;
int add(int x, int y) { x += y; return x >= mod ? x - mod : x; }
void sadd(int& x, int y) { x = add(x, y); }
const int N = 210;
int n, m;
int a[N], b[N];
int dp[N][N][26];
int cnt[N][N][2];
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cin >> n >> m;
for(int i = 0; i < m; i++) {
cin >> a[i] >> b[i];
for(int j = min(a[i], b[i]); j < max(a[i], b[i]); j++) {
for(int len = 1; len <= n; len++) {
if(j - len + 1 > min(a[i], b[i])) continue;
if(j < len) break;
if(a[i] < b[i]) cnt[j][len][0]++;
else cnt[j][len][1]++;
}
}
}
for(int i = 1; i <= n; i++) for(int j = 0; j < 26; j++) dp[i][i][j] = 1;
for(int i = 2; i <= n; i++) {
for(int len = 1; len <= i; len++) {
for(int c = 0; c < 26; c++) {
for(int j = 1; j <= i - len; j++) {
if(cnt[i - len][j][0] == 0 && cnt[i - len][j][1] == 0) {
for(int c2 = 0; c2 < c; c2++) sadd(dp[i][len][c], dp[i - len][j][c2]);
for(int c2 = c + 1; c2 < 26; c2++) sadd(dp[i][len][c], dp[i - len][j][c2]);
} else if(cnt[i - len][j][0] > 0 && cnt[i - len][j][1] == 0) {
for(int c2 = c + 1; c2 < 26; c2++) sadd(dp[i][len][c], dp[i - len][j][c2]);
} else if(cnt[i - len][j][0] == 0 && cnt[i - len][j][1] > 0) {
for(int c2 = 0; c2 < c; c2++) sadd(dp[i][len][c], dp[i - len][j][c2]);
} else break;
}
}
}
}
int ans = 0;
for(int len = 1; len <= n; len++) for(int c = 0; c < 26; c++) sadd(ans, dp[n][len][c]);
cout << ans;
return 0;
}
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