#include <bits/stdc++.h> using namespace std; #define el "\n" #define FOR(i,a,b) for(int i = (a), _b = (b); i <= _b; i++) #define FORD(i,a,b) for(int i = (a), _b = (b); i >= _b; i--) #define pb push_back #define fi first #define se second #define all(x) x.begin(),x.end() #define lg(x) __lg(x) #define alla(a,n) a+1,a+n+1 #define ll long long template <class T> bool maxi(T &x, T y) { if(x < y) { x = y ; return true ;} return false;} template <class T> bool mini(T &x, T y) { if(x > y) { x = y ; return true ;} return false;} const int N = 2e5 + 2; struct Queries { int x, y, w; } E[N]; int n, m; void inp() { cin >> n >> m; FOR(i, 1, m) { int x, y, w; cin >> x >> y >> w; E[i] = {x, y, w}; } } namespace subtask_1 { int st[4 * N], lz[4 * N]; void push(int id, int val) { st[id] += val; lz[id] += val; } void down(int id) { if(lz[id]) { int val = lz[id]; push(id << 1, val); push(id << 1 | 1, val); lz[id] = 0; } } void upd(int id, int l, int r, int u, int v, int val) { if(r < u || v < l) return; if(u <= l && r <= v) { push(id, val); return; } int mid = (r + l) >> 1; down(id); upd(id << 1, l, mid, u, v, val); upd(id << 1 | 1, mid + 1, r, u, v, val); st[id] = max(st[id << 1], st[id << 1 | 1]); } void slv() { FOR(i, 1, m) { auto [x, y, w] = E[i]; if(x > y) swap(x, y); int m1 = y - x; int m2 = x + (n - y); if(m1 < m2) { upd(1, 1, n, x, y - 1, w); } else { upd(1, 1, n, 1, x, 1); upd(1, 1, n, y + 1, n, w); } } cout << (st[1] + 1) / 2 << el; } } main() { ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0); #define __Azul__ "arranging_tickets" if(fopen(__Azul__".inp", "r")) { freopen(__Azul__".inp", "r", stdin); freopen(__Azul__".out", "w", stdout); } bool qs = 0; int T = 1; if(qs) cin >> T; while(T--) { inp(); subtask_1::slv(); } cerr << "\nTime" << 0.001 * clock() << "s "; return 0; }

arranging_tickets.cpp:90:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   90 | main()
      | ^~~~
arranging_tickets.cpp: In function 'int main()':
arranging_tickets.cpp:96:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   96 |         freopen(__Azul__".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
arranging_tickets.cpp:97:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   97 |         freopen(__Azul__".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~