Compilare: main.cpp: In function 'std::__cxx11::string test()': main.cpp:176:57: warning: suggest parentheses around assignment used as truth value [-Wparentheses] vis[i] = father[i] = color[i] = whereOnCycle[i] = mars[i] = ans[i] = 0; ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:176:28: warning: suggest parentheses around assignment used as truth value [-Wparentheses] vis[i] = father[i] = color[i] = whereOnCycle[i] = mars[i] = ans[i] = 0; ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:191:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < cycle.size(); ++ i) { ~~^~~~~~~~~~~~~~ main.cpp:225:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < neighCycle[0].size(); ++ i) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:227:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < neighCycle[0].size(); ++ i) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:230:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < neighCycle[1].size(); ++ i) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:232:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < neighCycle[1].size(); ++ i) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:235:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < neighCycle[0].size() && i < 2; ++ i) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:236:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < neighCycle[1].size() && j < 2; ++ j) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:245:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < cycle.size(); ++ i) { ~~^~~~~~~~~~~~~~ main.cpp: In member function 'void InputReader::advance()': main.cpp:35:51: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ main.cpp: In constructor 'InputReader::InputReader(const char*)': main.cpp:13:47: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^