顺时针打印矩阵
vectorclockwisePrint(vector > mat, int n, int m) { vector ret; int i=0; int j=0; int startx=0; int starty=0; int endx=n-1; int endy=m-1; while(startx<=endx && starty<=endy){ if(endy==starty){ for(j=endy,i=startx;i<=endx;++i){ ret.push_back(mat[i][j]); } return ret; } if(endx==startx){ for(i=startx,j=starty;j<=endy;++j){ ret.push_back(mat[i][j]); } return ret; } for(i=startx,j=starty;j<=endy;++j){ ret.push_back(mat[i][j]); } for(j=endy,i=startx+1;i<=endx;++i){ ret.push_back(mat[i][j]); } for(i=endx,j=endy-1;j>=starty;--j){ ret.push_back(mat[i][j]); } for(j=starty,i=endx-1;i>startx;--i){ ret.push_back(mat[i][j]); } startx++; starty++; endx--; endy--; } return ret; }
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