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为什么要递归呢 直接数长度是不是更简单 ?// 懒 于是直接数长度 从大到小数完了事 // 同上 于是没优化 渣代码 希望还能读 #include <cstdio> #include <cstring> #include <algorithm> struct Pos { int val; int u; int v; Pos() {} Pos(int _val, int _u, int _v) : val(_val), u(_u), v(_v) {} }; int cmp(Pos a, Pos b) { return a.val > b.val; } int main() { int row, col; scanf("%d %d", &row, &col); int mat[row][col]; for (int i=0; i<row; i++) for (int j=0; j<col; j++) scanf("%d", &(mat[i][j])); Pos pos[row*col]; for (int i=0; i<row; i++) for (int j=0; j<col; j++) pos[i*col+j] = Pos(mat[i][j], i, j); std::sort(pos, pos+row*col, cmp); int dist[row][col]; memset(dist, 0, sizeof(dist)); for (int it=0; it<row*col; it++) { int i = pos[it].u; int j = pos[it].v; if (i != 0 && mat[i][j] > mat[i-1][j]) dist[i-1][j] = std::max(dist[i-1][j], dist[i][j] + 1); if (i != row - 1 && mat[i][j] > mat[i+1][j]) dist[i+1][j] = std::max(dist[i+1][j], dist[i][j] + 1); if (j != 0 && mat[i][j] > mat[i][j-1]) dist[i][j-1] = std::max(dist[i][j-1], dist[i][j] + 1); if (j != col - 1 && mat[i][j] > mat[i][j+1]) dist[i][j+1] = std::max(dist[i][j+1], dist[i][j] + 1); } int length = 0; for (int i=0; i<row; i++) for (int j=0; j<col; j++) if (dist[i][j] > length) length = dist[i][j]; printf("%d\n", length+1); return 0; } Followed by:
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