Compilare: main.cpp: In function 'int main()': main.cpp:123:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graph[0].size(); ++i) { ~~^~~~~~~~~~~~~~~~~ main.cpp:138:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < graph[new_apm_node].size(); ++j) { ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:107:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &m); ^ main.cpp:110:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d", &x, &y, &c); ^