Submission #1006595

#TimeUsernameProblemLanguageResultExecution timeMemory
1006595devariaotaBigger segments (IZhO19_segments)C++17
0 / 100
1 ms6492 KiB
#include <bits/stdc++.h> using namespace std; #define all(x) (x).begin(), (x).end() typedef long long ll; typedef unsigned long long int ull; const ll md = 1e9+7; const int ukr = 5e5+10; int read() { int ketek = 0; bool ne=0; register char c = getchar(); while(c == ' ' or c =='\n') c =getchar(); if(c=='-'){ne = 1; c = getchar();} while(c >= '0' and c <='9') { ketek = (ketek<<3)+(ketek<<1)+c-'0'; c = getchar();} if(ne) ketek*=-1; return ketek; } void print(int x) { if (x < 0) {putchar('-');x = -x;} int len = 0, buf[10]; if (x == 0) {putchar('0');return;} while (x > 0) {buf[len++] = x % 10; x/=10;} while (len > 0) {putchar('0' + buf[--len]);} } void File_Work(){ freopen("test.in","r",stdin); freopen("test.out","w",stdout); } int n, m, a, b, c, d, id; struct babi{ ll x, y, id; }; struct babis{ ll x, y; }; ll gcd(ll a, ll b) { if (b == 0) return a; return gcd(b, a % b); } ll pgkt(ll rnx, ll rny){ if(rny == 0) return 1; ll nwrn = pgkt(rnx, rny/2); if(rny%2){ return (((nwrn*nwrn)%md)*rnx)%md; }else{ return (nwrn*nwrn)%md; } } vector<int> v; string s; ll pf[ukr], ar[ukr], lst[ukr], dp[ukr]; void solve(){ cin >> n; lst[0] = pf[0] = 0; for(int i = 1; i <= n; i++){ cin >> ar[i]; pf[i] = ar[i]+pf[i-1]; } for(ll i = 1; i <= n; i++){ ll l = i, r = n, res = -1; while(l <= r){ ll mid = l + (r-l)/2; if(2*pf[i]-pf[lst[i]] <= pf[mid]){ res = mid; r = mid-1; }else{ l = mid+1; } } if(res != -1) lst[res] = max(lst[res], i); lst[i] = max(lst[i-1], lst[i]); dp[i] = max(dp[i-1], dp[lst[i]]+1); } cout << dp[n] << "\n"; } int main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int t =1; //cin >> t; for(int i = 1; i <= t; i++){ //cout << "Case " << i << ": "; solve(); } }

Compilation message (stderr)

segments.cpp: In function 'int read()':
segments.cpp:10:19: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   10 |     register char c = getchar();
      |                   ^
segments.cpp: In function 'void File_Work()':
segments.cpp:25:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |   freopen("test.in","r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
segments.cpp:26:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |   freopen("test.out","w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
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