一开始没仔细审题被对齐卡了 = = 。。
#include <bits/stdc++.h> #define MP make_pair #define PB push_back #define st first #define nd second #define rd third #define rg register #define FOR(i, a, b) for(int i =(a); i <=(b); ++i) #define RE(i, n) FOR(i, 1, n) #define FORD(i, a, b) for(int i = (a); i >= (b); --i) #define REP(i, n) for(int i = 0;i <(n); ++i) #define VAR(v, i) __typeof(i) v=(i) #define FORE(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i) #define ALL(x) (x).begin(), (x).end() #define SZ(x) ((int)(x).size()) using namespace std; const int N = 712; int chess[N][N]; void bfs(int n, int m, int x, int y) { queue<pair<int, int>> q; q.push(pair<int, int>(x, y)); while (!q.empty()) { pair<int, int> node = q.front(); q.pop(); chess[node.first][node.second] += 1; if (node.first + 2 < n && node.second + 1 < m && chess[node.first + 2][node.second + 1] < 0) { chess[node.first + 2][node.second + 1] = chess[node.first][node.second]; q.push(pair<int, int>(node.first + 2, node.second + 1)); } if (node.first + 1 < n && node.second + 2 < m && chess[node.first + 1][node.second + 2] < 0) { chess[node.first + 1][node.second + 2] = chess[node.first][node.second]; q.push(pair<int, int>(node.first + 1, node.second + 2)); } if (node.first + 2 < n && node.second - 1 >= 0 && chess[node.first + 2][node.second - 1] < 0) { chess[node.first + 2][node.second - 1] = chess[node.first][node.second]; q.push(pair<int, int>(node.first + 2, node.second - 1)); } if (node.first + 1 < n && node.second - 2 >= 0 && chess[node.first + 1][node.second - 2] < 0) { chess[node.first + 1][node.second - 2] = chess[node.first][node.second]; q.push(pair<int, int>(node.first + 1, node.second - 2)); } if (node.first - 2 >= 0 && node.second + 1 < m && chess[node.first - 2][node.second + 1] < 0) { chess[node.first - 2][node.second + 1] = chess[node.first][node.second]; q.push(pair<int, int>(node.first - 2, node.second + 1)); } if (node.first - 1 >= 0 && node.second + 2 < m && chess[node.first - 1][node.second + 2] < 0) { chess[node.first - 1][node.second + 2] = chess[node.first][node.second]; q.push(pair<int, int>(node.first - 1, node.second + 2)); } if (node.first - 2 >= 0 && node.second - 1 >= 0 && chess[node.first - 2][node.second - 1] < 0) { chess[node.first - 2][node.second - 1] = chess[node.first][node.second]; q.push(pair<int, int>(node.first - 2, node.second - 1)); } if (node.first - 1 >= 0 && node.second - 2 >= 0 && chess[node.first - 1][node.second - 2] < 0) { chess[node.first - 1][node.second - 2] = chess[node.first][node.second]; q.push(pair<int, int>(node.first - 1, node.second - 2)); } } } int main() { int n, m, x, y; cin >> n >> m >> x >> y; REP(i, n) REP(j, m) chess[i][j] = -1; bfs(n, m, x - 1, y - 1); REP(i, n) { REP(j, m) printf("%-4d ", chess[i][j]); cout << endl; } return 0; }
原文:https://www.cnblogs.com/darkchii/p/9678508.html