Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:23:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[u].size();i++){ ~^~~~~~~~~~~~ user.cpp:12:13: warning: variable ‘costu’ set but not used [-Wunused-but-set-variable] int u, v, costu, costv, i; ^~~~~ user.cpp: In function ‘int main()’: user.cpp:42:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &t); ^ user.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", &n, &m, &start); ^ user.cpp:47:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &d1[i]); ^ user.cpp:49:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d",&a, &b, &c); ^