Compilare: main.cpp: In function 'void bfsdrag(int, int)': main.cpp:36:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < drag.size() ; i++ ) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:88:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d\n", &n, &m ) ; ^ main.cpp:122:12: warning: 'yf' may be used uninitialized in this function [-Wmaybe-uninitialized] if (verif(n, m, xf, yf, xst, yst, dr) == 1 ) ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:122:12: warning: 'xf' may be used uninitialized in this function [-Wmaybe-uninitialized] main.cpp:122:12: warning: 'yst' may be used uninitialized in this function [-Wmaybe-uninitialized] main.cpp:122:12: warning: 'xst' may be used uninitialized in this function [-Wmaybe-uninitialized]