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Zigzag.cpp
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Zigzag.cpp
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//Copyright [2018] [Haibo Yan]
//
//Licensed under the Apache License, Version 2.0 (the "License");
//you may not use this file except in compliance with the License.
//You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
//Unless required by applicable law or agreed to in writing, software
//distributed under the License is distributed on an "AS IS" BASIS,
//WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and
//limitations under the License.
//
// Created by Haibo Yan on 3/13/18.
//
#include "Zigzag.h"
string Zigzag::convert(string s, int numRows) {
if (numRows < 2 || s.length() == 0)
return s;
string zs = "";
for (int i = 0; i < numRows; i++) {
int sp1 = 2 * (numRows - i - 1);
int sp2 = 2 * i;
int zi = i;
bool add = true;
while (zi < s.size()) {
zs += s[zi];
if (sp1 == 0) {
zi += sp2;
} else if (sp2 == 0) {
zi += sp1;
} else if (add) {
zi += sp1;
} else {
zi += sp2;
}
add = !add;
}
}
return zs;
}