Compilare: main.cpp: In function 'void dfs1(int, int)': main.cpp:97:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < adj[n].size();i++) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int, int)': main.cpp:107:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < adj[n].size();i++) { ~~^~~~~~~~~~~~~~~ main.cpp:111:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < adj[n].size();i++) { ~~^~~~~~~~~~~~~~~ main.cpp:117:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < adj[n].size();i++) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:124:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(input, "%d%d", &N, &H); ^ main.cpp:126:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(input, "%d%d%d", &u, &v, &w); ^