제출 #525604

#제출 시각아이디문제언어결과실행 시간메모리
525604EvangElection (BOI18_election)C++17
0 / 100
2 ms332 KiB
#include <bits/extc++.h> using namespace std; using namespace __gnu_pbds; #ifdef _DEBUG #define dout(x) clog << "Line " << __LINE__ << ": " << #x << "=" << (x) << el #else #define dout(x) #endif mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); #define uid(a,b) uniform_int_distribution<int>(a,b)(rng) #define ins insert #define ssize(x) (int((x).size())) #define bs(args...) binary_search(args) #define lb(args...) lower_bound(args) #define ub(args...) upper_bound(args) #define all(x) (x).begin(),(x).end() #define mp(a, b) make_pair(a, b) #define mt(args...) make_tuple(args) #define pb(x) push_back(x) #define eb(args...) emplace_back(args) #define ff first #define ss second #define die exit(0) template<typename T> using vc = vector<T>; template<typename T> using uset = unordered_set<T>; template<typename A, typename B> using umap = unordered_map<A, B>; template<typename T, typename Comp> using pq = std::priority_queue<T, vc<T>, Comp>; template<typename T> using maxpq = pq<T, less<T>>; template<typename T> using minpq = pq<T, greater<T>>; template<typename T> using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; using db = double; using ld = long double; using ll = long long; using ull = unsigned long long; using pi = pair<int, int>; using pll = pair<ll, ll>; using vi = vc<int>; using vll = vc<ll>; using vpi = vc<pi>; using vpll = vc<pll>; using str = string; constexpr char el = '\n'; constexpr char sp = ' '; constexpr int inf = 0x3f3f3f3f; constexpr ll llinf = 0x3f3f3f3f3f3f3f3fLL; // --------------------------------------------------------------------- const int N = 5e5+5; int n, q, a[N], b[N]; int sum(int a[], int l, int r){ return max(0, a[r] - a[l-1]); } signed main() { ios::sync_with_stdio(0); cin.tie(0); cout << fixed; clog << fixed; clog << unitbuf; #ifdef _DEBUG freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout); freopen("debug.txt", "w", stderr); #else //freopen(".in", "r", stdin); //freopen(".out", "w", stdout); #endif cin >> n; for(int i = 1; i <= n; ++i){ char x; cin >> x; if(x=='C') b[i] = a[i] = -1; else b[i] = a[i] = 1; a[i] += a[i-1]; } for(int i = n-1; i > 0; --i) b[i] += b[i+1]; cin >> q; while(q--){ int l, r; cin >> l >> r; int ans = max(0, b[l]-b[r+1]); for(int i = l; i <= r; ++i) ans = max(ans, max(a[i]-a[l-1], 0) + max(0, b[i+1]-b[r+1])); // ans = max(ans, sum(l, i) + sum(i+1, r)); cout << ans << el; } }
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