Compilare: main.cpp: In function 'void dijkstra(int)': main.cpp:24:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[node].size(); i++) { ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:42:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &n, &m); ^ main.cpp:44:42: 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, &cost); ^