func_code_string: #include <bits/stdc++.h>   using namespace std;   template <typename T>   inline bool chkmin(T &x, T y) {     return x > y ? x = y, 1 : 0;   }   template <typename T>   inline bool chkmax(T &x, T y) {     return x < y ? x = y, 1 : 0;   }   inline void read(int &x) {     char ch = getchar();     int f = 1;     x = 0;     while (ch <  0  || ch >  9 ) {       if (ch ==  - ) f = -1;       ch = getchar();     }     while (ch >=  0  && ch <=  9 ) x = x * 10 + ch -  0 , ch = getchar();     x *= f;   }   int n, m, p[100050], v[100050], nx[100050], pr[100050], id[100050];   set<pair<int, int> > se;   int get(int x, int y) {     if (x == y) return 1000000005;     int d = (p[y] - p[x] + m) % m;     if (x > y) d += v[y];     if (d <= v[x]) return 1;     if (v[x] <= v[y]) return 1000000005;     return (d - v[y] - 1) / (v[x] - v[y]) + 1;   }   bool cmp(int x, int y) { return p[x] < p[y]; }   int main() {     read(n), read(m);     for (register int i = 1; i <= n; ++i)       read(p[i]), --p[i], read(v[i]), id[i] = i;     sort(id + 1, id + n + 1, cmp);     for (register int i = 1; i <= n; ++i)       pr[id[i]] = id[i - 1], nx[id[i]] = id[i + 1];     nx[pr[id[1]] = id[n]] = id[1];     for (register int i = 1; i <= n; ++i) se.insert(make_pair(get(i, nx[i]), i));     while (1) {       set<pair<int, int> >::iterator it = se.begin();       if (it->first >= 1000000005) break;       int u = it->second, t = it->first;       se.erase(it);       se.erase(make_pair(get(pr[u], u), pr[u])),           se.erase(make_pair(get(nx[u], nx[nx[u]]), nx[u]));       pr[nx[u] = nx[nx[u]]] = u;       p[u] = (p[u] + t) % m, --v[u];       se.insert(make_pair(get(pr[u], u), pr[u])),           se.insert(make_pair(get(u, nx[u]), u));     }     printf( %d n , se.size());     for (auto v : se) printf( %d  , v.second);     puts(  );     return 0;   }   