Compilare: main.cpp: In function 'void dfs(int)': main.cpp:16:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[nod].size(); ++i) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp:21:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int rsize = 2; rsize <= graph[nod].size(); ++rsize) { ~~~~~~^~~~~~~~~~~~~~~~~~~~ main.cpp:22:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i + rsize - 1 < graph[nod].size(); ++i) { ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:49:23: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &N); ^ main.cpp:51:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^