class Solution {
public:
bool searchMatrix(vector<vector<int> > &matrix, int target) {
int rows = matrix.size();
int cols = matrix[0].size();
int i = 0, j = cols-1;
while( 1 ) {
if( matrix[i][j] == target ) {
return true;
}
if( target < matrix[i][j] ) {
j--;
}
else {
i++;
}
if( i == rows || j == -1 ) {
return false;
}
}
return false;
}
};
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