Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:17:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:61:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:89:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[nod].size() == n){ ~~~~~~~~~~~~~~^~~~ main.cpp:91:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:136:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:146:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < v[nod].size() ; j++){ ~~^~~~~~~~~~~~~~~ main.cpp:11:25: warning: unused variable 'p1' [-Wunused-variable] int mini1 , mini2 , p1 , p2; ^~ main.cpp:11:30: warning: unused variable 'p2' [-Wunused-variable] int mini1 , mini2 , p1 , p2; ^~ main.cpp: In function 'int main()': main.cpp:184:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ main.cpp:186:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&a[i]); ^ main.cpp:188:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d",&x,&y,&z); ^