Compilare: main.cpp: In function 'std::__cxx11::string test()': main.cpp:141:57: 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:141:28: 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:156:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < cycle.size(); ++ i) { ~~^~~~~~~~~~~~~~ main.cpp:190:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < neighCycle[0].size(); ++ i) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:192:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < neighCycle[0].size(); ++ i) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:195:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < neighCycle[1].size(); ++ i) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:197:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < neighCycle[1].size(); ++ i) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:200:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < neighCycle[0].size() && i < 2; ++ i) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:201:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < neighCycle[1].size() && j < 2; ++ j) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:210:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < cycle.size(); ++ i) { ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:224:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("makebipartite.in", "r", stdin); ^ main.cpp:225:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("makebipartite.out", "w", stdout); ^