Compilare: main.cpp: In function 'int main()': main.cpp:35:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &n ); ^ main.cpp:36:46: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &nd[0].x, &nd[0].y ); ^ main.cpp:43:50: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &nd[i].x, &nd[i].y ); ^ main.cpp:38:13: warning: 'j' is used uninitialized in this function [-Wuninitialized] mk[k].x = j; ~~~~~~~~^~~ main.cpp:39:13: warning: 'i' is used uninitialized in this function [-Wuninitialized] mk[k].y = i; ~~~~~~~~^~~