Compilare: main.cpp: In function 'int main()': main.cpp:189:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < way.size(); i++) ~~^~~~~~~~~~~~ main.cpp:205:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i + 1 < way.size(); i++) ~~~~~~^~~~~~~~~~~~ main.cpp:239:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol.size(); i++) ~~^~~~~~~~~~~~ main.cpp:255:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i + 1 < sol.size(); i++) ~~~~~~^~~~~~~~~~~~ main.cpp:261:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p == sol.size()) ~~^~~~~~~~~~~~~ main.cpp:187:9: warning: variable 'p' set but not used [-Wunused-but-set-variable] int p; ^ main.cpp:99:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("domino.in", "r", stdin); ^ main.cpp:101:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("domino.out", "w", stdout); ^ main.cpp:185:21: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] euler(start, -1); ^