Compilare: main.cpp: In function 'void dfs2(int, int, int)': main.cpp:35:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[xx][yy].size(); i++) ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:40:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("robotei.in", "r", stdin); ^ main.cpp:41:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("robotei.out", "w", stdout); ^ main.cpp:43:74: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d%d%d", &n, &m, &x, &y, &modx, &mody, &offx, &offy); ^