Compilare: main.cpp: In function 'int main()': main.cpp:100:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < cyc1.size(); ++i) { ~~^~~~~~~~~~~~~ main.cpp:101:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < cyc1[i].size(); ++j) { ~~^~~~~~~~~~~~~~~~ main.cpp:51:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("transform2.in", "r", stdin); ^ main.cpp:52:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("transform2.out", "w", stdout); ^