Compilare: main.cpp: In function 'int main()': main.cpp:61:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < lists[pos].size(); i++) ~~^~~~~~~~~~~~~~~~~~~ main.cpp:34:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &n, &m, &k); ^ main.cpp:40:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &nr); ^ main.cpp:46:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &l, &r, &w); ^