func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MOD = (int)1e9 + 7;   const int FFTMOD = 119 << 23 | 1;   const int INF = (int)1e9 + 23111992;   const long long LINF = (long long)1e18 + 23111992;   const long double PI = acos((long double)-1);   const long double EPS = 1e-9;   inline long long gcd(long long a, long long b) {     long long r;     while (b) {       r = a % b;       a = b;       b = r;     }     return a;   }   inline long long lcm(long long a, long long b) { return a / gcd(a, b) * b; }   inline long long fpow(long long n, long long k, int p = MOD) {     long long r = 1;     for (; k; k >>= 1) {       if (k & 1) r = r * n % p;       n = n * n % p;     }     return r;   }   template <class T>   inline int chkmin(T& a, const T& val) {     return val < a ? a = val, 1 : 0;   }   template <class T>   inline int chkmax(T& a, const T& val) {     return a < val ? a = val, 1 : 0;   }   inline unsigned long long isqrt(unsigned long long k) {     unsigned long long r = sqrt(k) + 1;     while (r * r > k) r--;     return r;   }   inline long long icbrt(long long k) {     long long r = cbrt(k) + 1;     while (r * r * r > k) r--;     return r;   }   inline void addmod(int& a, int val, int p = MOD) {     if ((a = (a + val)) >= p) a -= p;   }   inline void submod(int& a, int val, int p = MOD) {     if ((a = (a - val)) < 0) a += p;   }   inline int mult(int a, int b, int p = MOD) { return (long long)a * b % p; }   inline int inv(int a, int p = MOD) { return fpow(a, p - 2, p); }   inline int sign(long double x) { return x < -EPS ? -1 : x > +EPS; }   inline int sign(long double x, long double y) { return sign(x - y); }   mt19937 mt(chrono::high_resolution_clock::now().time_since_epoch().count());   inline int mrand() { return abs((int)mt()); }   inline int mrand(int k) { return abs((int)mt()) % k; }   template <class num_t>   struct SegmentTree {     struct node_t {       num_t max[2];       num_t pref[2];       num_t suff[2];       num_t pref2[2];       num_t suff2[2];       num_t lz;       int size;       node_t() {         lz = 0;         size = -1;       }     };     int n;     vector<node_t> st;     void init(int n_) {       n = n_;       st.resize(n << 2);     }     node_t merge(node_t u, node_t v) {       if (u.size == -1) return v;       if (v.size == -1) return u;       node_t c;       for (int i = (0); i < (2); ++i) {         c.max[i] = max(u.max[i], v.max[i]);         c.pref[i] = u.pref[i];         c.suff[i] = v.suff[i];         c.pref2[i] = u.pref2[i];         c.suff2[i] = v.suff2[i];       }       for (int i = (0); i < (2); ++i) {         if (u.pref[i] == u.size) {           c.pref[i] = u.pref[i] + v.pref[i];         }         if (v.suff[i] == v.size) {           c.suff[i] = u.suff[i] + v.suff[i];         }         if (u.pref[i ^ 1] == u.size) {           c.pref2[i] = u.pref[i ^ 1] + v.pref2[i];         }         if (v.suff[i ^ 1] == v.size) {           c.suff2[i] = u.suff2[i] + v.suff[i ^ 1];         }         if (u.pref2[i] == u.size) {           chkmax(c.pref2[i], u.pref2[i] + v.pref[i]);         }         if (v.suff2[i] == v.size) {           chkmax(c.suff2[i], u.suff[i] + v.suff2[i]);         }       }       for (int i = (0); i < (2); ++i) {         chkmax(c.pref2[i], c.pref[i]);         chkmax(c.suff2[i], c.suff[i]);       }       for (int i = (0); i < (2); ++i) {         chkmax(c.max[i], c.pref[i]);         chkmax(c.max[i], c.suff[i]);         chkmax(c.max[i], c.pref2[i]);         chkmax(c.max[i], c.suff2[i]);         chkmax(c.max[i], u.suff[i] + v.pref2[i]);         chkmax(c.max[i], u.suff2[i] + v.pref[i]);       }       c.size = u.size + v.size;       return c;     }     void build(int p, int L, int R, vector<int>& a) {       if (L == R) {         st[p].max[0] = st[p].max[1] = 1;         for (int i = (0); i < (2); ++i) {           st[p].pref[i] = st[p].pref2[i] = (a[L] == i);           st[p].suff[i] = st[p].suff2[i] = (a[R] != i);         }         st[p].size = 1;         return;       }       build(p << 1, L, L + R >> 1, a);       build(p << 1 | 1, (L + R >> 1) + 1, R, a);       st[p] = merge(st[p << 1], st[p << 1 | 1]);     }     void push(int p, int L, int R) {       if (st[p].lz) {         swap(st[p].max[0], st[p].max[1]);         swap(st[p].pref[0], st[p].pref[1]);         swap(st[p].suff[0], st[p].suff[1]);         swap(st[p].pref2[0], st[p].pref2[1]);         swap(st[p].suff2[0], st[p].suff2[1]);         if (L < R) {           st[p << 1].lz ^= st[p].lz;           st[p << 1 | 1].lz ^= st[p].lz;         }         st[p].lz = 0;       }     }     void upd(int p, int l, int r, int L, int R, num_t val) {       push(p, L, R);       if (r < L || R < l) return;       if (l <= L && R <= r) {         st[p].lz = val;         push(p, L, R);         return;       }       upd(p << 1, l, r, L, L + R >> 1, val);       upd(p << 1 | 1, l, r, (L + R >> 1) + 1, R, val);       st[p] = merge(st[p << 1], st[p << 1 | 1]);     }     node_t query(int p, int l, int r, int L, int R) {       push(p, L, R);       if (r < L || R < l) return node_t();       if (l <= L && R <= r) {         return st[p];       }       return merge(query(p << 1, l, r, L, L + R >> 1),                    query(p << 1 | 1, l, r, (L + R >> 1) + 1, R));     }     void upd(int l, int r, num_t val) { upd(1, l, r, 0, n - 1, val); }     node_t query(int l, int r) { return query(1, l, r, 0, n - 1); }   };   SegmentTree<int> seg;   void chemthan() {     int n, q;     cin >> n >> q;     string s;     cin >> s;     vector<int> a(n);     for (int i = (0); i < (n); ++i) a[i] = s[i] ==  > ;     seg.init(n);     seg.build(1, 0, n - 1, a);     while (q--) {       int l, r;       cin >> l >> r;       l--, r--;       seg.upd(l, r, 1);       cout << seg.query(l, r).max[0] <<   n ;     }   }   int main(int argc, char* argv[]) {     ios_base::sync_with_stdio(0), cin.tie(0);     if (argc > 1) {       assert(freopen(argv[1],  r , stdin));     }     if (argc > 2) {       assert(freopen(argv[2],  wb , stdout));     }     chemthan();     cerr <<   nTime elapsed:   << 1000 * clock() / CLOCKS_PER_SEC <<  ms n ;     return 0;   }   