func_code_string: #include <bits/stdc++.h>   using namespace std;   namespace IO {   long long len = 0;   char ibuf[(1 << 20) + 1], *iS, *iT, out[(1 << 25) + 1];   inline long long read() {     char ch = (iS == iT ? iT = (iS = ibuf) + fread(ibuf, 1, (1 << 20) + 1, stdin),                (iS == iT ? EOF : *iS++) : *iS++);     long long x = 0;     char t = 0;     while (ch <  0  || ch >  9 )       t |= ch ==  - , ch = (iS == iT ? iT = (iS = ibuf) +                                             fread(ibuf, 1, (1 << 20) + 1, stdin),                             (iS == iT ? EOF : *iS++) : *iS++);     while (ch >=  0  && ch <=  9 )       x = x * 10 + (ch ^ 48),       ch = (iS == iT ? iT = (iS = ibuf) + fread(ibuf, 1, (1 << 20) + 1, stdin),             (iS == iT ? EOF : *iS++) : *iS++);     return t ? -x : x;   }   inline void putc(char ch) { out[len++] = ch; }   template <class T>   inline void write(T x) {     if (x < 0) putc( - ), x = -x;     if (x > 9) write(x / 10);     out[len++] = x % 10 + 48;   }   string getstr(void) {     string s =   ;     char c = (iS == iT ? iT = (iS = ibuf) + fread(ibuf, 1, (1 << 20) + 1, stdin),               (iS == iT ? EOF : *iS++) : *iS++);     while (c ==     || c ==   n  || c ==   r  || c ==   t  || c == EOF)       c = (iS == iT ? iT = (iS = ibuf) + fread(ibuf, 1, (1 << 20) + 1, stdin),            (iS == iT ? EOF : *iS++) : *iS++);     while (!(c ==     || c ==   n  || c ==   r  || c ==   t  || c == EOF))       s.push_back(c),           c = (iS == iT ? iT = (iS = ibuf) + fread(ibuf, 1, (1 << 20) + 1, stdin),                (iS == iT ? EOF : *iS++) : *iS++);     return s;   }   void putstr(string str, long long begin = 0, long long end = -1) {     if (end == -1) end = str.size();     for (long long i = begin; i < end; i++) putc(str[i]);     return;   }   inline void flush() {     fwrite(out, 1, len, stdout);     len = 0;   }   }  // namespace IO   using IO::flush;   using IO::getstr;   using IO::putc;   using IO::putstr;   using IO::read;   using IO::write;   const long long N = 3000;   long long n, m, q, ans, cnt, a[N][N], dp1[N][N], dp2[N][N];   void solve() {     n = read(), m = read(), q = read();     for (long long i = 1; i <= n; i++)       for (long long j = 1; j <= m; j++) dp1[i][j] = dp2[i][j] = 1;     for (long long i = 1; i <= n; i++) {       for (long long j = 1; j <= m; j++) {         if (i > 1) dp1[i][j] = 1 + dp2[i - 1][j];         if (j > 1) dp2[i][j] = 1 + dp1[i][j - 1];         a[i][j] = 1;       }     }     long long ans = 0, tot = n * m;     for (long long i = 1; i <= n; i++)       for (long long j = 1; j <= m; j++) ans += dp1[i][j] + dp2[i][j];     while (q--) {       long long i, j;       i = read(), j = read();       a[i][j] ^= 1;       if (a[i][j] == 0) {         tot--;         ans -= (dp1[i][j] + dp2[i][j]);         dp1[i][j] = dp2[i][j] = 0;         ans += (dp1[i][j] + dp2[i][j]);       } else {         tot++;         ans -= dp1[i][j] + dp2[i][j];         if (i > 1)           dp1[i][j] = 1 + dp2[i - 1][j];         else           dp1[i][j] = 1;         if (j > 1)           dp2[i][j] = 1 + dp1[i][j - 1];         else           dp2[i][j] = 1;         ans += dp1[i][j] + dp2[i][j];       }       while (i <= n && j <= m) {         if (i < n) {           ans -= dp1[i + 1][j];           dp1[i + 1][j] = a[i + 1][j] * (1 + dp2[i][j]);           ans += dp1[i + 1][j];         }         if (j < m) {           ans -= dp2[i][j + 1];           dp2[i][j + 1] = a[i][j + 1] * (1 + dp1[i][j]);           ans += dp2[i][j + 1];         }         if (i < n && j < m) {           ans -= dp1[i + 1][j + 1] + dp2[i + 1][j + 1];           dp1[i + 1][j + 1] = a[i + 1][j + 1] * (1 + dp2[i][j + 1]);           dp2[i + 1][j + 1] = a[i + 1][j + 1] * (1 + dp1[i + 1][j]);           ans += dp1[i + 1][j + 1] + dp2[i + 1][j + 1];         }         i++, j++;       }       cout << ans - tot <<     << endl;     }   }   signed main() {     solve();     return 0;   }   