///*** Sown_Vipro ***/// /// ->TEAM SELECTION TEST<- /// #include<bits/stdc++.h> using namespace std; //#pragma GCC optimize ("O3") //#pragma GCC optimize ("unroll-loops") //#pragma GCC target("popcnt") #define F first #define S second #define pb push_back #define pi pair<double, double> #define pii pair<int, pair<int, int> > #define FOR(i, a, b) for(int i = a; i <= b; ++i) #define REP(i, a, b) for(int i = a; i >= b; --i) #define all(s) s.begin(), s.end() #define szz(s) int(s.size()) const string NAME = "sown"; const int N = 1e6 + 5, MAX = 1e6, MOD = 1e9 + 7; void maxi(int &x, int y){ if(x < y) x = y; } void mini(int &x, int y){ if(x > y) x = y; }; void add(int &x, int y){ x += y; x += MOD * (x < 0); x -= MOD * (x >= MOD); }; int n, h; pi e[N]; pair<double, double> f(pi A, pi B){ double a = 1.0 * (1.0 * B.S - A.S) / (B.F - A.F); double b = A.S - a * A.F; return {a, b}; } double g(pair<double, double> A, pair<double, double> B){ return 1.0 * (B.S - A.S) / (A.F - B.F); } void solve(){ cin >> n >> h; FOR(i, 1, n){ cin >> e[i].F >> e[i].S; } double x = -1.0e18; int res = 0; for(int i = 3; i <= n - 2; i += 2){ pair<double, double> A = f(e[i - 1], e[i]); pair<double, double> B = {0, h}; if(g(A, B) <= x) continue; else{ ++res; A = f(e[i], e[i + 1]); x = g(A, B); } // cout << x << "\n"; // cout << A.F << " " << A.S << " " << B.F << " " << B.S << " " << g(A, B) << "\n"; } cout << res; } signed main(){ ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); if(fopen((NAME + ".inp").c_str(), "r")){ freopen((NAME + ".inp").c_str(), "r", stdin); freopen((NAME + ".out").c_str(), "w", stdout); } int t = 1; // cin >> t; while(t--){ solve(); } }

Main.cpp: In function 'int main()':
Main.cpp:65:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen((NAME + ".inp").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:66:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         freopen((NAME + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~