Compilare: main.cpp: In function 'void dfs1(int, int, int)': main.cpp:54:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < dp.size(); ++i) { ~~^~~~~~~~~~~ main.cpp:58:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < dp.size(); ++i) ~~^~~~~~~~~~~ main.cpp:62:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < dp.size(); ++i) { ~~^~~~~~~~~~~ main.cpp:67:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i + 1 != dp.size()) ~~~~~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:114:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pisici.in", "r", stdin); ^ main.cpp:115:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pisici.out", "w", stdout); ^