Compilare: user.cpp: In function ‘int main()’: user.cpp:37:51: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] dst[k & 1][i][j] = std::min(dst[1 - k & 1][i][j], dst[1 - k & 1][i][k] + dst[1 - k & 1][k][j]); ^ user.cpp:37:73: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] dst[k & 1][i][j] = std::min(dst[1 - k & 1][i][j], dst[1 - k & 1][i][k] + dst[1 - k & 1][k][j]); ^ user.cpp:37:96: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] dst[k & 1][i][j] = std::min(dst[1 - k & 1][i][j], dst[1 - k & 1][i][k] + dst[1 - k & 1][k][j]); ^ user.cpp:71:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < bits.size(); j++) { ^ user.cpp:23:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&n,&m); ^ user.cpp:31:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d %d " ,&x,&y,&cst); ^ user.cpp:40:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&t); ^ user.cpp:42:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&v[i]); ^