#pragma GCC optimize("O3,unroll-loops") #include <bits/stdc++.h> using namespace std; #define int long long #define ll long long #define pb push_back #define pii pair<int,int> #define sz(v) (int)v.size() #define fi first #define se second #define INF 1223372036854775807 #define INF2 122337203 #define MOD 998244353 #define cint(x) int x;cin>>x; #define cinarr(a,n) int a[n];for (int i=0;i<n;i++) cin>>a[i]; #define coutarr(a) for (auto d:a)cout<<d<<" "; cout<<endl; #define coutarrD(a) for (auto d:a) cout<<d.fi<<","<<d.se<<" "; cout<<endl; #define BERKAY_TUP ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL) #define endl '\n' #define ld long double #define mid (start+end)/2 #define vvi vector<vector<int>> int t=1; int interactive=0; int usaco=0; int testCase=0; int tree[2000023][2]; int z[500023]; int cc(int l,int r){ return z[r]-z[l-1]; } int tt(int l,int r){ return (r-l+1-cc(l,r)); } string s; void build(int n,int start,int end){ if (start==end){ if(s[start-1]=='C'){ tree[n][0]=0; tree[n][1]=0; } else{ tree[n][0]=1; tree[n][1]=1; } return; } build(n*2,start,mid); build(n*2+1,mid+1,end); int k=cc(start,mid)-tt(start,mid)+tree[n*2][0]; tree[n][0]=max(tree[n*2+1][0]-k,0ll)+tree[n*2][0]; int g=tree[n*2+1][1]-tree[n*2+1][0]+min(tree[n*2+1][0],k)+max(tree[n*2+1][0]-k,0ll); int k2=cc(mid+1,end)-tt(mid+1,end)+g; int g2=max(tree[n*2][1]-tree[n*2][0]-k2,0ll)+tree[n*2][0]; tree[n][1]=g+g2; //cout<<n<<" "<<start<<" "<<end<<" "<<tree[n][0]<<" "<<tree[n][1]<<endl; } pii query(int n,int start,int end,int l,int r){ if (start>end || start>r || end<l) return {-1,-1}; if (start>=l && end<=r) return {tree[n][0],tree[n][1]}; pii c1=query(n*2,start,mid,l,r); pii c2=query(n*2+1,mid+1,end,l,r); if (c1.fi==-1) return c2; if (c2.fi==-1) return c1; int k=cc(l,mid)-tt(l,mid)+c1.fi; int ans1=max(c2.se-k,0ll)+c1.fi; int g=c2.se-c2.fi+min(c2.se,k)+max(c2.fi-k,0ll); int k2=cc(mid+1,r)-tt(mid+1,r)+g; int g2=max(c1.se-c1.fi-k2,0ll)+c1.fi; int ans2=g+g2; return {ans1,ans2}; } void solve(){ int n; cin>>n; cin>>s; int sm=0; for (int i=1;i<=n;i++){ if (s[i-1]=='C') sm++; z[i]=sm; } build(1,1,n); int q; cin>>q; while (q--){ int l,r; cin>>l>>r; pii z=query(1,1,n,l,r); cout<<z.se<<endl; } } int32_t main(){ BERKAY_TUP; if (usaco){ freopen("team.in", "r", stdin); freopen("team.out", "w", stdout); } if (!interactive){ #ifdef Local freopen("in.txt", "r", stdin); freopen("out2.txt", "w", stdout); //freopen("wormsort.out", "w", stdout); #endif } if (t==1) solve(); else{ cin>>t; while (t--){testCase++;solve();} } return 0; }

election.cpp: In function 'int32_t main()':
election.cpp:113:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  113 |         freopen("team.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
election.cpp:114:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  114 |         freopen("team.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~