Compilare: main.cpp: In function 'int main()': main.cpp:62:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1 ; i < li.size() ; ++ i) { ~~^~~~~~~~~~~ main.cpp:59:13: warning: unused variable 'value' [-Wunused-variable] int value = vv.first ; ^~~~~ main.cpp:52:9: warning: unused variable 'left' [-Wunused-variable] int left, right ; ^~~~ main.cpp:52:15: warning: unused variable 'right' [-Wunused-variable] int left, right ; ^~~~~ main.cpp:47:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d\n", &n) ; ^ main.cpp:49:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d ", v + i) ; ^