#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
// #include <atcoder/all>
#include <cstdio>
using namespace std;
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif
#define sz(x) (int((x).size()))
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define blt(x) __builtin_popcount(x)
#define uniq(x) x.resize(unique(all(x)) - x.begin());
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ld long double
#define ll long long
void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}
void print(long double t) {cerr << t;}
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T> void print(T v[],T n) {cerr << "["; for(int i = 0; i < n; i++) {cerr << v[i] << " ";} cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
// for random generations
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
// mt19937 myrand(131);
// for grid problems
int dx[8] = {1,0,-1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};
char ch[4] = {'v', '>', '^', '<'};
long long ka() {
long long x = 0;
bool z = false;
while (1)
{
char y = getchar();
if (y == '-')
z = true;
else if ('0' <= y && y <= '9')
x = x * 10 + y - '0';
else
{
if (z)
x *= -1;
return x;
}
}
}
// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
fastIO();
if (str != "") {
freopen((str + ".in").c_str(), "r", stdin);
freopen((str + ".out").c_str(), "w", stdout);
} else if(str == "input") {
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
}
}
// Indexed Set
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const int N = 5e5 + 10;
vector<pair<int, int>> pp[N];
int ans[N];
struct segtree {
struct node {
long long sum, suffix;
};
node combine (node a, node b) {
node c;
c.sum = a.sum + b.sum;
c.suffix = min(b.sum + a.suffix, b.suffix);
return c;
}
vector<node> mTree;
int size;
void init(ll n) {
size = 1;
while(size < n) {
size *= 2;
}
mTree.assign(2 * size - 1, {0, 0});
}
void set(int u, ll v, int x, int lx, int rx) {
if(rx - lx == 1) {
mTree[x] = {v, min(0ll, v)};
return;
}
int m = (lx + rx) / 2;
if(u < m) {
set(u, v, 2 * x + 1, lx, m);
}else {
set(u, v, 2 * x + 2, m, rx);
}
mTree[x] = combine(mTree[2 * x + 1], mTree[2 * x + 2]);
}
void set(int u, ll v) {
set(u, v, 0, 0, size);
}
node range (int l, int r, int x, int lx, int rx) {
if(l >= rx || lx >= r) {
return {0, 0};
}
if(lx >= l && r >= rx) {
return mTree[x];
}
int m = (rx + lx) / 2;
node s1 = range(l, r, 2 * x + 1, lx, m);
node s2 = range(l, r, 2 * x + 2, m, rx);
return combine(s1, s2);
}
node range(int l, int r) {
return range(l, r, 0, 0, size);
}
};
segtree seg;
void solve_() {
int n; cin >> n;
string s; cin >> s;
int q; cin >> q;
for(int i = 1; i <= q; i++) {
int l, r; cin >> l >> r;
pp[l].emplace_back(r, i);
}
seg.init(n + 1);
for(int i = 0; i < n; i++) {
if(s[i] == 'T') {
seg.set(i + 1, -1);
} else {
seg.set(i + 1, 1);
}
}
vector<int> ts;
for(int i = n; i >= 1; i--) {
if(s[i - 1] == 'T') {
ts.push_back(i);
seg.set(i, 0);
} else if(!ts.empty()) {
seg.set(ts.back(), -1);
ts.pop_back();
}
for(auto j: pp[i]) {
int cur = seg.range(i, j.first + 1).suffix;
if(cur < 0) {
cur = -cur;
} else {
cur = 0;
}
ans[j.second] = cur + upper_bound(all(ts), j.first) - ts.begin();
}
}
for(int i = 1; i <= q; i++) {
cout << ans[i] << '\n';
}
}
int main() {
setIO();
auto solve = [&](int test_case)-> void {
while(test_case--) {
solve_();
}
};
int test_cases = 1;
// cin >> test_cases;
solve(test_cases);
return 0;
}
Compilation message
election.cpp: In function 'void setIO(std::string)':
election.cpp:90:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
90 | freopen((str + ".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
election.cpp:91:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
91 | freopen((str + ".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
election.cpp:93:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
93 | freopen("input.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
election.cpp:94:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
94 | freopen("output.txt", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
8 ms |
12116 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
8 ms |
12116 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
8 ms |
12116 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
