比赛 |
2025暑期集训第8场 |
评测结果 |
AATAAAAAAA |
题目名称 |
引水入城 |
最终得分 |
90 |
用户昵称 |
对立猫猫对立 |
运行时间 |
1.289 s |
代码语言 |
C++ |
内存使用 |
3.93 MiB |
提交时间 |
2025-08-13 11:46:51 |
显示代码纯文本
#include <bits/stdc++.h>
using namespace std;
const int dx[] = {-1, 1, 0, 0};
const int dy[] = {0, 0, -1, 1};
struct Interval {
int left;
int right;
bool operator<(const Interval& other) const {
return left < other.left;
}
};
int main() {
freopen("flow.in", "r", stdin);
freopen("flow.out", "w", stdout);
int N, M;
cin >> N >> M;
vector<vector<int>> height(N, vector<int>(M));
for (int i = 0; i < N; ++i) {
for (int j = 0; j < M; ++j) {
cin >> height[i][j];
}
}
vector<Interval> intervals;
for (int j = 0; j < M; ++j) {
vector<vector<bool>> visited(N, vector<bool>(M, false));
queue<pair<int, int>> q;
q.push({0, j});
visited[0][j] = true;
int left = M, right = -1;
while (!q.empty()) {
auto current = q.front();
q.pop();
int x = current.first;
int y = current.second;
if (x == N - 1) {
left = min(left, y);
right = max(right, y);
}
for (int k = 0; k < 4; ++k) {
int nx = x + dx[k];
int ny = y + dy[k];
if (nx >= 0 && nx < N && ny >= 0 && ny < M && !visited[nx][ny] && height[nx][ny] < height[x][y]) {
visited[nx][ny] = true;
q.push({nx, ny});
}
}
}
if (right != -1) {
intervals.push_back({left, right});
}
}
vector<bool> covered(M, false);
for (const auto& interval : intervals) {
for (int j = interval.left; j <= interval.right; ++j) {
covered[j] = true;
}
}
int uncovered = 0;
for (bool c : covered) {
if (!c) uncovered++;
}
if (uncovered > 0) {
cout << 0 << endl << uncovered << endl;
return 0;
}
sort(intervals.begin(), intervals.end());
int count = 0;
int current_pos = 0;
int max_right = -1;
int i = 0;
while (current_pos < M) {
max_right = -1;
while (i < intervals.size() && intervals[i].left <= current_pos) {
if (intervals[i].right > max_right) {
max_right = intervals[i].right;
}
i++;
}
count++;
current_pos = max_right + 1;
}
cout << 1 << endl << count << endl;
return 0;
}