func_code_string: #include <bits/stdc++.h>   using namespace std;   int dx[8] = {-1, -1, -1, 0, 1, 1, 1, 0};   int dy[8] = {-1, 0, 1, 1, 1, 0, -1, -1};   const int N = 100005;   struct mes {     char c;     int id;   };   int n, m;   bool no[N];   mes all[N];   int p[N];   int main() {     scanf( %d%d , &n, &m);     for (int i = 0; i < m; i++) {       cin >> all[i].c >> all[i].id;     }     int on = 0;     for (int i = 0; i < m; i++) {       if (all[i].c ==  + ) {         p[all[i].id] = 1;       }       if (all[i].c ==  -  && !p[all[i].id]) {         p[all[i].id] = 0;         on++;       }     }     for (int i = 0; i < m; i++) {       if (all[i].c ==  +  && (on || (i > 0 && all[i - 1].id != all[i].id))) {         no[all[i].id] = 1;       }       if (all[i].c ==  + ) {         on++;       }       if (all[i].c ==  - ) {         on--;       }       if (all[i].c ==  -  &&           (on || (i + 1 < m && (all[i + 1].id != all[i].id)))) {         no[all[i].id] = 1;       }     }     int k = 0;     for (int i = 1; i <= n; i++) {       k += 1 - no[i];     }     cout << k << endl;     for (int i = 1; i <= n; i++) {       if (!no[i]) {         cout << i <<    ;       }     }     cout << endl;     return 0;   }   