fix.修复一些编译warning

src/MeoAssistance/AbstractTask.cpp

@@ -34,7 +34,7 @@ bool AbstractTask::sleep(unsigned millisecond)
         return true;
     }
     auto start = std::chrono::system_clock::now();
-    unsigned duration = 0;
+    long long duration = 0;
 
     json::value callback_json;
     callback_json["time"] = millisecond;

src/MeoAssistance/MultiMatchImageAnalyzer.cpp

@@ -54,7 +54,7 @@ bool asst::MultiMatchImageAnalyzer::multi_match_templ(const cv::Mat& templ)
         cv::matchTemplate(image_roi, templ, matched, cv::TM_CCOEFF_NORMED, mask);
     }
 
-    int mini_distance = (std::min)(templ.cols, templ.rows) * 0.5;
+    int mini_distance = (std::min)(templ.cols, templ.rows) / 2;
     for (int i = 0; i != matched.rows; ++i) {
         for (int j = 0; j != matched.cols; ++j) {
             auto value = matched.at<float>(i, j);

src/MeoAssistance/RecruitTask.cpp

@@ -63,8 +63,8 @@ bool RecruitTask::run()
 
     // 识别到的5个Tags，全组合排列
     std::vector<std::vector<std::string>> all_combs;
-    int len = all_tags.size();
-    int count = std::pow(2, len);
+    size_t len = all_tags.size();
+    int count = (std::pow)(2, len);
     for (int i = 0; i < count; ++i) {
         std::vector<std::string> temp;
         for (int j = 0, mask = 1; j < len; ++j) {