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Submission #638276

#TimeUsernameProblemLanguageResultExecution timeMemory
638276colazcyNivelle (COCI20_nivelle)C++17
110 / 110
209 ms10956 KiB
#include <cstdio> #include <cassert> #include <algorithm> #include <vector> #define let const auto #define rep(name,beg,end) for(auto lim_##name = end,name = beg;name <= lim_##name;name++) #define per(name,beg,end) for(auto lim_##name = end,name = beg;name >= lim_##name;name--) #define repn(lim) for(auto REPN_lIM = lim,REPN = 1;REPN <= REPN_lIM;REPN++) #define debug(...) fprintf(stderr,__VA_ARGS__) #define trace() debug("line : %d, Function : %s\n",__LINE__,__FUNCTION__) using ll = long long; constexpr int maxn = 1e5 + 100,sigma = 26,inf = 0x3f3f3f3f; char buf[maxn]; int n,val[maxn],nxt[maxn][sigma]; struct Frac{ int fz,fm; bool operator < (const Frac t)const{ return fz * t.fm < t.fz * fm; } }; Frac mi{514,114}; std::pair<int,int> ans; int main(){ std::scanf("%d",&n); std::scanf("%s",buf + 1); rep(i,1,n)val[i] = buf[i] - 'a'; rep(c,0,sigma - 1)nxt[n + 1][c] = n + 1; per(i,n,1) rep(c,0,sigma - 1) if(val[i] == c)nxt[i][c] = i; else nxt[i][c] = nxt[i + 1][c]; rep(l,1,n){ std::vector<int> pos; std::vector<bool> vis(sigma); int r = l; while(r <= n){ vis[val[r]] = 1; pos.push_back(r); std::pair<int,int> pir{inf,0}; rep(c,0,25) if(!vis[c]) pir = std::min(pir,std::make_pair(nxt[r][c],c)); r = pir.first; } pos.push_back(n + 1); for(size_t i = 1;i < pos.size();i++){ let t = Frac{(int)i,pos[i] - l}; if(t < mi){ mi = t; ans = std::make_pair(l,pos[i] - 1); } } } std::printf("%d %d\n",ans.first,ans.second); return 0; }

Compilation message (stderr)

nivelle.cpp: In function 'int main()':
nivelle.cpp:28:15: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     std::scanf("%d",&n);
      |     ~~~~~~~~~~^~~~~~~~~
nivelle.cpp:29:15: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |     std::scanf("%s",buf + 1);
      |     ~~~~~~~~~~^~~~~~~~~~~~~~
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