題目：

題解：

int maximalSquare(char** matrix, int matrixSize, int* matrixColSize){int dp[301][301]={0};int wid=0;if(matrixSize==0&&matrixColSize[0]==0){return 0;}for(int i=0;i<matrixSize;i++){for(int j=0;j<matrixColSize[0];j++){if(matrix[i][j]=='1'){if(i==0||j==0){dp[i][j]=1;}else{dp[i][j]=fmin(dp[i-1][j],fmin(dp[i][j-1],dp[i-1][j-1]))+1;}}wid=fmax(wid,dp[i][j]);}}return wid*wid;}