Submission #1246754

#TimeUsernameProblemLanguageResultExecution timeMemory
1246754hainam2k9Sum Zero (RMI20_sumzero)C++20
100 / 100
258 ms20840 KiB
#include <bits/stdc++.h> #define tt cin.tie(0), cout.tie(0), ios_base::sync_with_stdio(0) #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout) #define ll long long #define ull unsigned long long #define i128 __int128 #define db long double #define sz(a) ((int)(a).size()) #define pb emplace_back #define pf emplace_front #define pob pop_back #define pof pop_front #define lb lower_bound #define ub upper_bound #define fi first #define se second #define ins emplace #define mp make_pair using namespace std; const int MOD = 1e9+7, MAXN = 4e5+5; const string NAME = ""; int n,q,a[MAXN],nxt[MAXN],depth[MAXN],jump[MAXN]; map<ll,int> pos; int main() { tt; if(fopen((NAME + ".INP").c_str(), "r")) fo; cin >> n; for(int i = 1; i<=n; ++i) cin >> a[i]; nxt[n+1]=n+2; pos[0]=n+1; ll sum=0; for(int i = n; i>0; --i){ sum+=a[i]; nxt[i]=(pos[sum]==0 ? n+2 : pos[sum]); nxt[i]=min(nxt[i],nxt[i+1]); pos[sum]=i; } pos.clear(); jump[n+1]=n+2, depth[n+1]=0; jump[n+2]=n+2, depth[n+2]=-1e9; for(int i = n; i>0; --i){ int p=nxt[i]; depth[i]=depth[p]+1; if(depth[p]-depth[jump[p]]==depth[jump[p]]-depth[jump[jump[p]]]) jump[i]=jump[jump[p]]; else jump[i]=p; } cin >> q; while(q--){ int l,r,rs=0; cin >> l >> r; while(nxt[l]<=r+1){ if(jump[l]<=r+1) rs+=depth[l]-depth[jump[l]], l=jump[l]; else ++rs, l=nxt[l]; } cout << rs << "\n"; } }

Compilation message (stderr)

sumzero.cpp: In function 'int main()':
sumzero.cpp:3:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    3 | #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
      |            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sumzero.cpp:27:45: note: in expansion of macro 'fo'
   27 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~
sumzero.cpp:3:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    3 | #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
      |                                                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sumzero.cpp:27:45: note: in expansion of macro 'fo'
   27 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~
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