Submission #491871

#TimeUsernameProblemLanguageResultExecution timeMemory
491871ValiAntonieFancy Fence (CEOI20_fancyfence)C++14
15 / 100
34 ms7876 KiB
#include <bits/stdc++.h> #define mod 1000000007 using namespace std; stack <pair<long long,long long>> S; unsigned long long n,v[100005],i,dr[100005],st[100005],x,suma[100001],mars[100001],j,val,Max[100005]; pair <long long,long long > sor[100005]; long long total; long long bin(long long x){ x %= mod; return ((x*(x+1))/2)%mod; } long long rectCount(long long x, long long y){ return (bin(x)*bin(y))%mod; } int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cin>>n; for(i=1;i<=n;i++){ cin>>v[i]; sor[i].first = v[i]; sor[i].second = i; } sort(sor+1,sor+n+1); for(i=1;i<=n;i++){ cin>>x; suma[i] = suma[i-1] + x; } for(i=1;i<=n;i++){ x = v[i]; while(S.empty() == false && x<S.top().first){ dr[S.top().second] = i; S.pop(); } S.push({x,i}); } while(S.empty() == false){ S.pop(); } for(i=n;i>=1;i--){ x = v[i]; while(S.empty() == false && x < S.top().first){ st[S.top().second] = i; S.pop(); } S.push({x,i}); } for(i=1;i<=n;i++){ if(!dr[i]) dr[i] = n + 1; } for(i=1;i<=n;i++){ total += rectCount(suma[dr[sor[i].second]-1] - suma[st[sor[i].second]],sor[i].first) % mod; total -= rectCount(suma[dr[sor[i].second]-1] - suma[st[sor[i].second]],sor[i-1].first) % mod; } cout << total % mod; return 0; }

Compilation message (stderr)

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:37:34: warning: comparison of integer expressions of different signedness: 'long long unsigned int' and 'long long int' [-Wsign-compare]
   37 |     while(S.empty() == false && x<S.top().first){
      |                                 ~^~~~~~~~~~~~~~
fancyfence.cpp:48:35: warning: comparison of integer expressions of different signedness: 'long long unsigned int' and 'long long int' [-Wsign-compare]
   48 |     while(S.empty() == false && x < S.top().first){
      |                                 ~~^~~~~~~~~~~~~~~
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