#include <bits/stdc++.h>
using namespace std;
mt19937 mt(0);
int find_num(int n, int m, vector<int> &nexts, vector<pair<int, int>>& looks, int num) {
int start = -1;
int start_pos = -1;
for (auto [id, pos] : looks) {
if (pos <= num) {
if (start_pos < pos) {
start = id;
start_pos = pos;
}
}
}
for (int i = start_pos; i < num; i++) {
start = nexts[start];
}
return start;
}
int main() {
int n, m;
cin >> n >> m;
string initial_string;
cin >> initial_string;
vector<int> nexts(n + 2);
for (int i = 0; i < n + 2; i++) {
if (i == n + 1) {
nexts[i] = -1;
} else {
nexts[i] = i + 1;
}
}
vector<int> prevs(n + 2);
for (int i = 0; i < n + 2; i++) {
if (i == 0) {
prevs[i] = -1;
} else {
prevs[i] = i - 1;
}
}
vector<pair<int, int>> looks;
looks.emplace_back(0, 0);
uniform_int_distribution<> r(0, n - 1);
for (int i = 0; i * i < n; i++) {
int t = r(mt);
looks.emplace_back(t + 1, t + 1);
}
for (int i = 0; i < m; i++) {
char q;
cin >> q;
if (q == 'a') {
int a, b, x, y;
cin >> a >> b;
x = find_num(n, m, nexts, looks, a);
y = find_num(n, m, nexts, looks, b);
int px = prevs[x];
int py = prevs[y];
int nx = nexts[x];
int ny = nexts[y];
if (a < b) {
nexts[px] = nx;
prevs[nx] = px;
nexts[y] = x;
prevs[x] = y;
nexts[x] = ny;
prevs[ny] = x;
for (int j = 0; j < looks.size(); j++) {
if (looks[j].second == a) {
looks[j].second = b;
} else if (a <= looks[j].second && looks[j].second <= b) {
looks[j].second--;
}
}
} else {
nexts[py] = x;
prevs[x] = py;
nexts[x] = y;
prevs[y] = x;
nexts[px] = nx;
prevs[nx] = px;
for (int j = 0; j < looks.size(); j++) {
if (looks[j].second == a) {
looks[j].second = b;
} else if (b <= looks[j].second && looks[j].second <= a) {
looks[j].second++;
}
}
}
} else {
int num;
cin >> num;
int res = find_num(n, m, nexts, looks, num);
char ans = initial_string[res - 1];
cout << ans << endl;
}
}
}
Compilation message
collider.cpp: In function 'int find_num(int, int, std::vector<int>&, std::vector<std::pair<int, int> >&, int)':
collider.cpp:9:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
9 | for (auto [id, pos] : looks) {
| ^
collider.cpp: In function 'int main()':
collider.cpp:79:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
79 | for (int j = 0; j < looks.size(); j++) {
| ~~^~~~~~~~~~~~~~
collider.cpp:96:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
96 | for (int j = 0; j < looks.size(); j++) {
| ~~^~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
348 KB |
Output is correct |
| 2 |
Runtime error |
10 ms |
556 KB |
Execution killed with signal 6 |
| 3 |
Halted |
0 ms |
0 KB |
- |
