Compilare: main.cpp: In function 'int main()': main.cpp:94:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < cyc.size() and !ok; ++i) { ~~^~~~~~~~~~~~ main.cpp:106:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j <= i + cyc.size() - 2; ++j) { ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:54:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sistem3.in", "r", stdin); ^ main.cpp:55:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sistem3.out", "w", stdout); ^